Staging: Use proper mutexes in the tsi-148 VME driver
The VME core and tsi-148 driver currently use semaphores as mutexes. Switch to proper mutex implementation. Signed-off-by: Martyn Welch <martyn.welch@gefanuc.com> Reviewed-by: Emilio G. Cota <cota@braap.org> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
This commit is contained in:
Martyn Welch
Greg Kroah-Hartman
parent
238add523b
commit
400822fec4
3 changed files with 71 additions and 83 deletions
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@ -76,13 +76,13 @@ void (*lm_callback[4])(int); /* Called in interrupt handler, be careful! */
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void *crcsr_kernel;
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dma_addr_t crcsr_bus;
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struct vme_master_resource *flush_image;
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struct semaphore vme_rmw; /* Only one RMW cycle at a time */
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struct semaphore vme_int; /*
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struct mutex vme_rmw; /* Only one RMW cycle at a time */
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struct mutex vme_int; /*
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* Only one VME interrupt can be
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* generated at a time, provide locking
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*/
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struct semaphore vme_irq; /* Locking for VME irq callback configuration */
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struct semaphore vme_lm; /* Locking for location monitor operations */
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struct mutex vme_irq; /* Locking for VME irq callback configuration */
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struct mutex vme_lm; /* Locking for location monitor operations */
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static char driver_name[] = "vme_tsi148";
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@ -445,11 +445,10 @@ int tsi148_request_irq(int level, int statid,
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{
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u32 tmp;
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/* Get semaphore */
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down(&(vme_irq));
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mutex_lock(&(vme_irq));
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if(tsi148_bridge->irq[level - 1].callback[statid].func) {
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up(&(vme_irq));
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mutex_unlock(&(vme_irq));
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printk("VME Interrupt already taken\n");
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return -EBUSY;
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}
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@ -468,8 +467,7 @@ int tsi148_request_irq(int level, int statid,
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tmp |= TSI148_LCSR_INTEN_IRQEN[level - 1];
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iowrite32be(tmp, tsi148_bridge->base + TSI148_LCSR_INTEN);
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/* Release semaphore */
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up(&(vme_irq));
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mutex_unlock(&(vme_irq));
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return 0;
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}
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@ -482,8 +480,7 @@ void tsi148_free_irq(int level, int statid)
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u32 tmp;
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struct pci_dev *pdev;
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/* Get semaphore */
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down(&(vme_irq));
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mutex_lock(&(vme_irq));
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tsi148_bridge->irq[level - 1].count--;
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@ -505,22 +502,18 @@ void tsi148_free_irq(int level, int statid)
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tsi148_bridge->irq[level - 1].callback[statid].func = NULL;
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tsi148_bridge->irq[level - 1].callback[statid].priv_data = NULL;
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/* Release semaphore */
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up(&(vme_irq));
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mutex_unlock(&(vme_irq));
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}
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/*
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* Generate a VME bus interrupt at the requested level & vector. Wait for
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* interrupt to be acked.
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*
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* Only one interrupt can be generated at a time - so add a semaphore.
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*/
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int tsi148_generate_irq(int level, int statid)
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{
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u32 tmp;
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/* Get semaphore */
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down(&(vme_int));
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mutex_lock(&(vme_int));
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/* Read VICR register */
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tmp = ioread32be(tsi148_bridge->base + TSI148_LCSR_VICR);
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@ -537,8 +530,7 @@ int tsi148_generate_irq(int level, int statid)
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/* XXX Consider implementing a timeout? */
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wait_event_interruptible(iack_queue, tsi148_iack_received());
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/* Release semaphore */
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up(&(vme_int));
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mutex_unlock(&(vme_int));
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return 0;
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}
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@ -1379,7 +1371,7 @@ ssize_t tsi148_master_read(struct vme_master_resource *image, void *buf,
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}
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/* XXX We need to change vme_master_resource->sem to a spinlock so that read
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/* XXX We need to change vme_master_resource->mtx to a spinlock so that read
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* and write functions can be used in an interrupt context
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*/
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ssize_t tsi148_master_write(struct vme_master_resource *image, void *buf,
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@ -1455,7 +1447,7 @@ unsigned int tsi148_master_rmw(struct vme_master_resource *image,
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i = image->number;
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/* Locking as we can only do one of these at a time */
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down(&(vme_rmw));
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mutex_lock(&(vme_rmw));
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/* Lock image */
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spin_lock(&(image->lock));
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@ -1490,7 +1482,7 @@ unsigned int tsi148_master_rmw(struct vme_master_resource *image,
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spin_unlock(&(image->lock));
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up(&(vme_rmw));
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mutex_unlock(&(vme_rmw));
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return result;
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}
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@ -1867,7 +1859,7 @@ int tsi148_dma_list_exec(struct vme_dma_list *list)
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ctrlr = list->parent;
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down(&(ctrlr->sem));
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mutex_lock(&(ctrlr->mtx));
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channel = ctrlr->number;
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@ -1878,7 +1870,7 @@ int tsi148_dma_list_exec(struct vme_dma_list *list)
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* Return busy.
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*/
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/* Need to add to pending here */
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up(&(ctrlr->sem));
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mutex_unlock(&(ctrlr->mtx));
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return -EBUSY;
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} else {
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list_add(&(list->list), &(ctrlr->running));
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@ -1932,7 +1924,7 @@ int tsi148_dma_list_exec(struct vme_dma_list *list)
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bus_addr = virt_to_bus(&(entry->descriptor));
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up(&(ctrlr->sem));
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mutex_unlock(&(ctrlr->mtx));
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reg_split(bus_addr, &bus_addr_high, &bus_addr_low);
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@ -1959,9 +1951,9 @@ int tsi148_dma_list_exec(struct vme_dma_list *list)
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}
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/* Remove list from running list */
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down(&(ctrlr->sem));
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mutex_lock(&(ctrlr->mtx));
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list_del(&(list->list));
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up(&(ctrlr->sem));
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mutex_unlock(&(ctrlr->mtx));
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return retval;
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}
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@ -1999,13 +1991,12 @@ int tsi148_lm_set(unsigned long long lm_base, vme_address_t aspace,
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u32 lm_base_high, lm_base_low, lm_ctl = 0;
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int i;
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/* Get semaphore */
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down(&(vme_lm));
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mutex_lock(&(vme_lm));
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/* If we already have a callback attached, we can't move it! */
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for (i = 0; i < 4; i++) {
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if(lm_callback[i] != NULL) {
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up(&(vme_lm));
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mutex_unlock(&(vme_lm));
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printk("Location monitor callback attached, can't "
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"reset\n");
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return -EBUSY;
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@ -2026,7 +2017,7 @@ int tsi148_lm_set(unsigned long long lm_base, vme_address_t aspace,
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lm_ctl |= TSI148_LCSR_LMAT_AS_A64;
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break;
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default:
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up(&(vme_lm));
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mutex_unlock(&(vme_lm));
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printk("Invalid address space\n");
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return -EINVAL;
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break;
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@ -2047,7 +2038,7 @@ int tsi148_lm_set(unsigned long long lm_base, vme_address_t aspace,
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iowrite32be(lm_base_low, tsi148_bridge->base + TSI148_LCSR_LMBAL);
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iowrite32be(lm_ctl, tsi148_bridge->base + TSI148_LCSR_LMAT);
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up(&(vme_lm));
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mutex_unlock(&(vme_lm));
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return 0;
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}
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@ -2060,8 +2051,7 @@ int tsi148_lm_get(unsigned long long *lm_base, vme_address_t *aspace,
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{
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u32 lm_base_high, lm_base_low, lm_ctl, enabled = 0;
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/* Get semaphore */
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down(&(vme_lm));
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mutex_lock(&(vme_lm));
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lm_base_high = ioread32be(tsi148_bridge->base + TSI148_LCSR_LMBAU);
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lm_base_low = ioread32be(tsi148_bridge->base + TSI148_LCSR_LMBAL);
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@ -2094,7 +2084,7 @@ int tsi148_lm_get(unsigned long long *lm_base, vme_address_t *aspace,
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if (lm_ctl & TSI148_LCSR_LMAT_DATA)
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*cycle |= VME_DATA;
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up(&(vme_lm));
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mutex_unlock(&(vme_lm));
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return enabled;
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}
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@ -2108,20 +2098,19 @@ int tsi148_lm_attach(int monitor, void (*callback)(int))
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{
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u32 lm_ctl, tmp;
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/* Get semaphore */
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down(&(vme_lm));
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mutex_lock(&(vme_lm));
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/* Ensure that the location monitor is configured - need PGM or DATA */
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lm_ctl = ioread32be(tsi148_bridge->base + TSI148_LCSR_LMAT);
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if ((lm_ctl & (TSI148_LCSR_LMAT_PGM | TSI148_LCSR_LMAT_DATA)) == 0) {
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up(&(vme_lm));
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mutex_unlock(&(vme_lm));
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printk("Location monitor not properly configured\n");
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return -EINVAL;
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}
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/* Check that a callback isn't already attached */
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if (lm_callback[monitor] != NULL) {
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up(&(vme_lm));
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mutex_unlock(&(vme_lm));
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printk("Existing callback attached\n");
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return -EBUSY;
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}
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@ -2144,7 +2133,7 @@ int tsi148_lm_attach(int monitor, void (*callback)(int))
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iowrite32be(lm_ctl, tsi148_bridge->base + TSI148_LCSR_LMAT);
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}
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up(&(vme_lm));
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mutex_unlock(&(vme_lm));
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return 0;
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}
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@ -2156,8 +2145,7 @@ int tsi148_lm_detach(int monitor)
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{
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u32 lm_en, tmp;
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/* Get semaphore */
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down(&(vme_lm));
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mutex_lock(&(vme_lm));
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/* Disable Location Monitor and ensure previous interrupts are clear */
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lm_en = ioread32be(tsi148_bridge->base + TSI148_LCSR_INTEN);
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@ -2182,7 +2170,7 @@ int tsi148_lm_detach(int monitor)
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iowrite32be(tmp, tsi148_bridge->base + TSI148_LCSR_LMAT);
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}
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up(&(vme_lm));
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mutex_unlock(&(vme_lm));
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return 0;
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}
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@ -2347,10 +2335,10 @@ static int tsi148_probe(struct pci_dev *pdev, const struct pci_device_id *id)
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init_waitqueue_head(&dma_queue[0]);
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init_waitqueue_head(&dma_queue[1]);
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init_waitqueue_head(&iack_queue);
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init_MUTEX(&(vme_int));
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init_MUTEX(&(vme_irq));
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init_MUTEX(&(vme_rmw));
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init_MUTEX(&(vme_lm));
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mutex_init(&(vme_int));
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mutex_init(&(vme_irq));
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mutex_init(&(vme_rmw));
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mutex_init(&(vme_lm));
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tsi148_bridge->parent = &(pdev->dev);
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strcpy(tsi148_bridge->name, driver_name);
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@ -2436,7 +2424,7 @@ static int tsi148_probe(struct pci_dev *pdev, const struct pci_device_id *id)
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goto err_slave;
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}
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slave_image->parent = tsi148_bridge;
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init_MUTEX(&(slave_image->sem));
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mutex_init(&(slave_image->mtx));
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slave_image->locked = 0;
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slave_image->number = i;
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slave_image->address_attr = VME_A16 | VME_A24 | VME_A32 |
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@ -2462,7 +2450,7 @@ static int tsi148_probe(struct pci_dev *pdev, const struct pci_device_id *id)
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goto err_dma;
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}
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dma_ctrlr->parent = tsi148_bridge;
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init_MUTEX(&(dma_ctrlr->sem));
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mutex_init(&(dma_ctrlr->mtx));
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dma_ctrlr->locked = 0;
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dma_ctrlr->number = i;
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INIT_LIST_HEAD(&(dma_ctrlr->pending));
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@ -28,15 +28,15 @@
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#include <linux/device.h>
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#include <linux/dma-mapping.h>
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#include <linux/syscalls.h>
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#include <linux/semaphore.h>
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#include <linux/mutex.h>
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#include <linux/spinlock.h>
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#include "vme.h"
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#include "vme_bridge.h"
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/* Bitmask and semaphore to keep track of bridge numbers */
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/* Bitmask and mutex to keep track of bridge numbers */
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static unsigned int vme_bus_numbers;
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DECLARE_MUTEX(vme_bus_num_sem);
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DEFINE_MUTEX(vme_bus_num_mtx);
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static void __exit vme_exit (void);
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static int __init vme_init (void);
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@ -251,17 +251,17 @@ struct vme_resource * vme_slave_request(struct device *dev,
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}
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/* Find an unlocked and compatible image */
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down(&(slave_image->sem));
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mutex_lock(&(slave_image->mtx));
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if(((slave_image->address_attr & address) == address) &&
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((slave_image->cycle_attr & cycle) == cycle) &&
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(slave_image->locked == 0)) {
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slave_image->locked = 1;
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up(&(slave_image->sem));
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mutex_unlock(&(slave_image->mtx));
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allocated_image = slave_image;
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break;
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}
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up(&(slave_image->sem));
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mutex_unlock(&(slave_image->mtx));
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}
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/* No free image */
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@ -280,9 +280,9 @@ struct vme_resource * vme_slave_request(struct device *dev,
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err_alloc:
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/* Unlock image */
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down(&(slave_image->sem));
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mutex_lock(&(slave_image->mtx));
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slave_image->locked = 0;
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up(&(slave_image->sem));
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mutex_unlock(&(slave_image->mtx));
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err_image:
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err_bus:
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return NULL;
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@ -365,12 +365,12 @@ void vme_slave_free(struct vme_resource *resource)
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}
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/* Unlock image */
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down(&(slave_image->sem));
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mutex_lock(&(slave_image->mtx));
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if (slave_image->locked == 0)
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printk(KERN_ERR "Image is already free\n");
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slave_image->locked = 0;
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up(&(slave_image->sem));
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mutex_unlock(&(slave_image->mtx));
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/* Free up resource memory */
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kfree(resource);
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@ -668,14 +668,14 @@ struct vme_resource *vme_request_dma(struct device *dev)
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}
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/* Find an unlocked controller */
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down(&(dma_ctrlr->sem));
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mutex_lock(&(dma_ctrlr->mtx));
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if(dma_ctrlr->locked == 0) {
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dma_ctrlr->locked = 1;
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up(&(dma_ctrlr->sem));
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mutex_unlock(&(dma_ctrlr->mtx));
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allocated_ctrlr = dma_ctrlr;
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break;
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}
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up(&(dma_ctrlr->sem));
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mutex_unlock(&(dma_ctrlr->mtx));
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}
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/* Check to see if we found a resource */
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@ -694,9 +694,9 @@ struct vme_resource *vme_request_dma(struct device *dev)
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err_alloc:
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/* Unlock image */
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down(&(dma_ctrlr->sem));
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mutex_lock(&(dma_ctrlr->mtx));
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dma_ctrlr->locked = 0;
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up(&(dma_ctrlr->sem));
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mutex_unlock(&(dma_ctrlr->mtx));
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err_ctrlr:
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err_bus:
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return NULL;
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@ -726,7 +726,7 @@ struct vme_dma_list *vme_new_dma_list(struct vme_resource *resource)
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}
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INIT_LIST_HEAD(&(dma_list->entries));
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dma_list->parent = ctrlr;
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init_MUTEX(&(dma_list->sem));
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mutex_init(&(dma_list->mtx));
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return dma_list;
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}
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@ -876,14 +876,14 @@ int vme_dma_list_add(struct vme_dma_list *list, struct vme_dma_attr *src,
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return -EINVAL;
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}
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if (down_trylock(&(list->sem))) {
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if (mutex_trylock(&(list->mtx))) {
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printk("Link List already submitted\n");
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return -EINVAL;
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}
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retval = bridge->dma_list_add(list, src, dest, count);
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up(&(list->sem));
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mutex_unlock(&(list->mtx));
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return retval;
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}
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@ -899,11 +899,11 @@ int vme_dma_list_exec(struct vme_dma_list *list)
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return -EINVAL;
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}
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down(&(list->sem));
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mutex_lock(&(list->mtx));
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retval = bridge->dma_list_exec(list);
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up(&(list->sem));
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mutex_unlock(&(list->mtx));
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return retval;
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}
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@ -919,7 +919,7 @@ int vme_dma_list_free(struct vme_dma_list *list)
|
|||
return -EINVAL;
|
||||
}
|
||||
|
||||
if (down_trylock(&(list->sem))) {
|
||||
if (mutex_trylock(&(list->mtx))) {
|
||||
printk("Link List in use\n");
|
||||
return -EINVAL;
|
||||
}
|
||||
|
|
@ -931,10 +931,10 @@ int vme_dma_list_free(struct vme_dma_list *list)
|
|||
retval = bridge->dma_list_empty(list);
|
||||
if (retval) {
|
||||
printk("Unable to empty link-list entries\n");
|
||||
up(&(list->sem));
|
||||
mutex_unlock(&(list->mtx));
|
||||
return retval;
|
||||
}
|
||||
up(&(list->sem));
|
||||
mutex_unlock(&(list->mtx));
|
||||
kfree(list);
|
||||
|
||||
return retval;
|
||||
|
|
@ -952,20 +952,20 @@ int vme_dma_free(struct vme_resource *resource)
|
|||
|
||||
ctrlr = list_entry(resource->entry, struct vme_dma_resource, list);
|
||||
|
||||
if (down_trylock(&(ctrlr->sem))) {
|
||||
if (mutex_trylock(&(ctrlr->mtx))) {
|
||||
printk("Resource busy, can't free\n");
|
||||
return -EBUSY;
|
||||
}
|
||||
|
||||
if (!(list_empty(&(ctrlr->pending)) && list_empty(&(ctrlr->running)))) {
|
||||
printk("Resource still processing transfers\n");
|
||||
up(&(ctrlr->sem));
|
||||
mutex_unlock(&(ctrlr->mtx));
|
||||
return -EBUSY;
|
||||
}
|
||||
|
||||
ctrlr->locked = 0;
|
||||
|
||||
up(&(ctrlr->sem));
|
||||
mutex_unlock(&(ctrlr->mtx));
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
|
@ -1149,23 +1149,23 @@ static int vme_alloc_bus_num(void)
|
|||
{
|
||||
int i;
|
||||
|
||||
down(&vme_bus_num_sem);
|
||||
mutex_lock(&vme_bus_num_mtx);
|
||||
for (i = 0; i < sizeof(vme_bus_numbers) * 8; i++) {
|
||||
if (((vme_bus_numbers >> i) & 0x1) == 0) {
|
||||
vme_bus_numbers |= (0x1 << i);
|
||||
break;
|
||||
}
|
||||
}
|
||||
up(&vme_bus_num_sem);
|
||||
mutex_unlock(&vme_bus_num_mtx);
|
||||
|
||||
return i;
|
||||
}
|
||||
|
||||
static void vme_free_bus_num(int bus)
|
||||
{
|
||||
down(&vme_bus_num_sem);
|
||||
mutex_lock(&vme_bus_num_mtx);
|
||||
vme_bus_numbers |= ~(0x1 << bus);
|
||||
up(&vme_bus_num_sem);
|
||||
mutex_unlock(&vme_bus_num_mtx);
|
||||
}
|
||||
|
||||
int vme_register_bridge (struct vme_bridge *bridge)
|
||||
|
|
|
|||
|
|
@ -11,7 +11,7 @@ struct vme_master_resource {
|
|||
struct vme_bridge *parent;
|
||||
/*
|
||||
* We are likely to need to access the VME bus in interrupt context, so
|
||||
* protect master routines with a spinlock rather than a semaphore.
|
||||
* protect master routines with a spinlock rather than a mutex.
|
||||
*/
|
||||
spinlock_t lock;
|
||||
int locked;
|
||||
|
|
@ -26,7 +26,7 @@ struct vme_master_resource {
|
|||
struct vme_slave_resource {
|
||||
struct list_head list;
|
||||
struct vme_bridge *parent;
|
||||
struct semaphore sem;
|
||||
struct mutex mtx;
|
||||
int locked;
|
||||
int number;
|
||||
vme_address_t address_attr;
|
||||
|
|
@ -53,13 +53,13 @@ struct vme_dma_list {
|
|||
struct list_head list;
|
||||
struct vme_dma_resource *parent;
|
||||
struct list_head entries;
|
||||
struct semaphore sem;
|
||||
struct mutex mtx;
|
||||
};
|
||||
|
||||
struct vme_dma_resource {
|
||||
struct list_head list;
|
||||
struct vme_bridge *parent;
|
||||
struct semaphore sem;
|
||||
struct mutex mtx;
|
||||
int locked;
|
||||
int number;
|
||||
struct list_head pending;
|
||||
|
|
|
|||
Loading…
Reference in a new issue