pcmcia: simplify locking
replace pcmcia_socket->lock and pcmcia_dev_list_lock by using the per-socket "ops_mutex", as we do neither need different locks nor a spinlock here. Tested-by: Wolfram Sang <w.sang@pengutronix.de> Signed-off-by: Dominik Brodowski <linux@dominikbrodowski.net>
This commit is contained in:
Dominik Brodowski
parent
3d3de32fad
commit
00ce99ff50
7 changed files with 51 additions and 77 deletions
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@ -175,8 +175,6 @@ int pcmcia_register_socket(struct pcmcia_socket *socket)
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dev_dbg(&socket->dev, "pcmcia_register_socket(0x%p)\n", socket->ops);
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spin_lock_init(&socket->lock);
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/* try to obtain a socket number [yes, it gets ugly if we
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* register more than 2^sizeof(unsigned int) pcmcia
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* sockets... but the socket number is deprecated
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@ -182,8 +182,6 @@ int pccard_get_tuple_data(struct pcmcia_socket *s, tuple_t *tuple);
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#ifdef CONFIG_PCMCIA_IOCTL
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/* ds.c */
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extern spinlock_t pcmcia_dev_list_lock;
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extern struct pcmcia_device *pcmcia_get_dev(struct pcmcia_device *p_dev);
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extern void pcmcia_put_dev(struct pcmcia_device *p_dev);
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@ -42,8 +42,6 @@ MODULE_DESCRIPTION("PCMCIA Driver Services");
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MODULE_LICENSE("GPL");
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spinlock_t pcmcia_dev_list_lock;
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/*====================================================================*/
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static void pcmcia_check_driver(struct pcmcia_driver *p_drv)
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@ -265,7 +263,6 @@ static int pcmcia_device_probe(struct device *dev)
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struct pcmcia_device_id *did;
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struct pcmcia_socket *s;
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cistpl_config_t cis_config;
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unsigned long flags;
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int ret = 0;
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dev = get_device(dev);
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@ -316,11 +313,11 @@ static int pcmcia_device_probe(struct device *dev)
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goto put_module;
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}
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spin_lock_irqsave(&pcmcia_dev_list_lock, flags);
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mutex_lock(&s->ops_mutex);
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if (did && (did->match_flags & PCMCIA_DEV_ID_MATCH_DEVICE_NO) &&
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(p_dev->socket->device_count == 1) && (p_dev->device_no == 0))
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pcmcia_add_device_later(p_dev->socket, 0);
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spin_unlock_irqrestore(&pcmcia_dev_list_lock, flags);
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mutex_unlock(&s->ops_mutex);
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put_module:
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if (ret)
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@ -339,28 +336,27 @@ static void pcmcia_card_remove(struct pcmcia_socket *s, struct pcmcia_device *le
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{
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struct pcmcia_device *p_dev;
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struct pcmcia_device *tmp;
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unsigned long flags;
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dev_dbg(leftover ? &leftover->dev : &s->dev,
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"pcmcia_card_remove(%d) %s\n", s->sock,
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leftover ? leftover->devname : "");
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spin_lock_irqsave(&pcmcia_dev_list_lock, flags);
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mutex_lock(&s->ops_mutex);
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if (!leftover)
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s->device_count = 0;
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else
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s->device_count = 1;
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spin_unlock_irqrestore(&pcmcia_dev_list_lock, flags);
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mutex_unlock(&s->ops_mutex);
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/* unregister all pcmcia_devices registered with this socket, except leftover */
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list_for_each_entry_safe(p_dev, tmp, &s->devices_list, socket_device_list) {
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if (p_dev == leftover)
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continue;
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spin_lock_irqsave(&pcmcia_dev_list_lock, flags);
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mutex_lock(&s->ops_mutex);
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list_del(&p_dev->socket_device_list);
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p_dev->_removed = 1;
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spin_unlock_irqrestore(&pcmcia_dev_list_lock, flags);
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mutex_unlock(&s->ops_mutex);
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dev_dbg(&p_dev->dev, "unregistering device\n");
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device_unregister(&p_dev->dev);
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@ -507,7 +503,6 @@ static DEFINE_MUTEX(device_add_lock);
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struct pcmcia_device *pcmcia_device_add(struct pcmcia_socket *s, unsigned int function)
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{
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struct pcmcia_device *p_dev, *tmp_dev;
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unsigned long flags;
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s = pcmcia_get_socket(s);
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if (!s)
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@ -521,9 +516,9 @@ struct pcmcia_device *pcmcia_device_add(struct pcmcia_socket *s, unsigned int fu
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if (!p_dev)
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goto err_put;
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spin_lock_irqsave(&pcmcia_dev_list_lock, flags);
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mutex_lock(&s->ops_mutex);
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p_dev->device_no = (s->device_count++);
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spin_unlock_irqrestore(&pcmcia_dev_list_lock, flags);
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mutex_unlock(&s->ops_mutex);
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/* max of 4 devices per card */
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if (p_dev->device_no >= 4)
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@ -546,7 +541,7 @@ struct pcmcia_device *pcmcia_device_add(struct pcmcia_socket *s, unsigned int fu
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goto err_free;
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dev_dbg(&p_dev->dev, "devname is %s\n", p_dev->devname);
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spin_lock_irqsave(&pcmcia_dev_list_lock, flags);
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mutex_lock(&s->ops_mutex);
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/*
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* p_dev->function_config must be the same for all card functions.
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@ -564,7 +559,7 @@ struct pcmcia_device *pcmcia_device_add(struct pcmcia_socket *s, unsigned int fu
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/* Add to the list in pcmcia_bus_socket */
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list_add(&p_dev->socket_device_list, &s->devices_list);
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spin_unlock_irqrestore(&pcmcia_dev_list_lock, flags);
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mutex_unlock(&s->ops_mutex);
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if (!p_dev->function_config) {
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dev_dbg(&p_dev->dev, "creating config_t\n");
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@ -589,14 +584,14 @@ struct pcmcia_device *pcmcia_device_add(struct pcmcia_socket *s, unsigned int fu
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return p_dev;
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err_unreg:
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spin_lock_irqsave(&pcmcia_dev_list_lock, flags);
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mutex_lock(&s->ops_mutex);
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list_del(&p_dev->socket_device_list);
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spin_unlock_irqrestore(&pcmcia_dev_list_lock, flags);
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mutex_unlock(&s->ops_mutex);
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err_free:
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spin_lock_irqsave(&pcmcia_dev_list_lock, flags);
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mutex_lock(&s->ops_mutex);
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s->device_count--;
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spin_unlock_irqrestore(&pcmcia_dev_list_lock, flags);
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mutex_unlock(&s->ops_mutex);
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kfree(p_dev->devname);
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kfree(p_dev);
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@ -650,13 +645,12 @@ static void pcmcia_delayed_add_device(struct work_struct *work)
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struct pcmcia_socket *s =
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container_of(work, struct pcmcia_socket, device_add);
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u8 mfc_pfc;
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unsigned long flags;
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spin_lock_irqsave(&pcmcia_dev_list_lock, flags);
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mutex_lock(&s->ops_mutex);
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mfc_pfc = s->pcmcia_state.mfc_pfc;
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s->pcmcia_state.device_add_pending = 0;
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s->pcmcia_state.mfc_pfc = 0;
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spin_unlock_irqrestore(&pcmcia_dev_list_lock, flags);
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mutex_unlock(&s->ops_mutex);
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dev_dbg(&s->dev, "adding additional device to %d\n", s->sock);
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pcmcia_device_add(s, mfc_pfc);
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@ -677,15 +671,14 @@ static void pcmcia_bus_rescan(struct pcmcia_socket *skt, int new_cis)
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{
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int no_devices = 0;
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int ret = 0;
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unsigned long flags;
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/* must be called with skt_mutex held */
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dev_dbg(&skt->dev, "re-scanning socket %d\n", skt->sock);
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spin_lock_irqsave(&pcmcia_dev_list_lock, flags);
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mutex_lock(&skt->ops_mutex);
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if (list_empty(&skt->devices_list))
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no_devices = 1;
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spin_unlock_irqrestore(&pcmcia_dev_list_lock, flags);
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mutex_unlock(&skt->ops_mutex);
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/* If this is because of a CIS override, start over */
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if (new_cis && !no_devices)
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@ -769,11 +762,9 @@ static int pcmcia_load_firmware(struct pcmcia_device *dev, char * filename)
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if (old_funcs > no_funcs)
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pcmcia_card_remove(s, dev);
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else if (no_funcs > old_funcs) {
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unsigned long flags;
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spin_lock_irqsave(&pcmcia_dev_list_lock, flags);
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mutex_lock(&s->ops_mutex);
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pcmcia_add_device_later(s, 1);
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spin_unlock_irqrestore(&pcmcia_dev_list_lock, flags);
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mutex_unlock(&s->ops_mutex);
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}
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}
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release:
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@ -1248,7 +1239,6 @@ static int pcmcia_bus_suspend(struct pcmcia_socket *skt)
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static int ds_event(struct pcmcia_socket *skt, event_t event, int priority)
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{
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struct pcmcia_socket *s = pcmcia_get_socket(skt);
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unsigned long flags;
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if (!s) {
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dev_printk(KERN_ERR, &skt->dev,
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@ -1262,9 +1252,9 @@ static int ds_event(struct pcmcia_socket *skt, event_t event, int priority)
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switch (event) {
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case CS_EVENT_CARD_REMOVAL:
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spin_lock_irqsave(&pcmcia_dev_list_lock, flags);
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mutex_lock(&s->ops_mutex);
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s->pcmcia_state.present = 0;
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spin_unlock_irqrestore(&pcmcia_dev_list_lock, flags);
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mutex_unlock(&s->ops_mutex);
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pcmcia_card_remove(skt, NULL);
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handle_event(skt, event);
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mutex_lock(&s->ops_mutex);
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@ -1273,10 +1263,8 @@ static int ds_event(struct pcmcia_socket *skt, event_t event, int priority)
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break;
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case CS_EVENT_CARD_INSERTION:
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spin_lock_irqsave(&pcmcia_dev_list_lock, flags);
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s->pcmcia_state.present = 1;
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spin_unlock_irqrestore(&pcmcia_dev_list_lock, flags);
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mutex_lock(&s->ops_mutex);
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s->pcmcia_state.present = 1;
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destroy_cis_cache(s); /* to be on the safe side... */
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mutex_unlock(&s->ops_mutex);
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pcmcia_card_add(skt);
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@ -1321,13 +1309,12 @@ struct pcmcia_device *pcmcia_dev_present(struct pcmcia_device *_p_dev)
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{
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struct pcmcia_device *p_dev;
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struct pcmcia_device *ret = NULL;
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unsigned long flags;
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p_dev = pcmcia_get_dev(_p_dev);
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if (!p_dev)
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return NULL;
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spin_lock_irqsave(&pcmcia_dev_list_lock, flags);
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mutex_lock(&p_dev->socket->ops_mutex);
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if (!p_dev->socket->pcmcia_state.present)
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goto out;
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@ -1342,7 +1329,7 @@ struct pcmcia_device *pcmcia_dev_present(struct pcmcia_device *_p_dev)
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ret = p_dev;
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out:
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spin_unlock_irqrestore(&pcmcia_dev_list_lock, flags);
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mutex_unlock(&p_dev->socket->ops_mutex);
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pcmcia_put_dev(p_dev);
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return ret;
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}
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@ -1406,14 +1393,13 @@ static void pcmcia_bus_remove_socket(struct device *dev,
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struct class_interface *class_intf)
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{
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struct pcmcia_socket *socket = dev_get_drvdata(dev);
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unsigned long flags;
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if (!socket)
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return;
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spin_lock_irqsave(&pcmcia_dev_list_lock, flags);
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mutex_lock(&socket->ops_mutex);
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socket->pcmcia_state.dead = 1;
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spin_unlock_irqrestore(&pcmcia_dev_list_lock, flags);
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mutex_unlock(&socket->ops_mutex);
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pccard_register_pcmcia(socket, NULL);
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@ -1455,8 +1441,6 @@ static int __init init_pcmcia_bus(void)
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{
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int ret;
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spin_lock_init(&pcmcia_dev_list_lock);
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ret = bus_register(&pcmcia_bus_type);
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if (ret < 0) {
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printk(KERN_WARNING "pcmcia: bus_register error: %d\n", ret);
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@ -62,16 +62,15 @@ static struct pcmcia_device *get_pcmcia_device(struct pcmcia_socket *s,
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unsigned int function)
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{
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struct pcmcia_device *p_dev = NULL;
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unsigned long flags;
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spin_lock_irqsave(&pcmcia_dev_list_lock, flags);
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mutex_lock(&s->ops_mutex);
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list_for_each_entry(p_dev, &s->devices_list, socket_device_list) {
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if (p_dev->func == function) {
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spin_unlock_irqrestore(&pcmcia_dev_list_lock, flags);
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mutex_unlock(&s->ops_mutex);
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return pcmcia_get_dev(p_dev);
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}
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}
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spin_unlock_irqrestore(&pcmcia_dev_list_lock, flags);
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mutex_unlock(&s->ops_mutex);
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return NULL;
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}
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@ -169,7 +168,6 @@ static int pcmcia_adjust_resource_info(adjust_t *adj)
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{
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struct pcmcia_socket *s;
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int ret = -ENOSYS;
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unsigned long flags;
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down_read(&pcmcia_socket_list_rwsem);
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list_for_each_entry(s, &pcmcia_socket_list, socket_list) {
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@ -182,14 +180,14 @@ static int pcmcia_adjust_resource_info(adjust_t *adj)
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/* you can't use the old interface if the new
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* one was used before */
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spin_lock_irqsave(&s->lock, flags);
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mutex_lock(&s->ops_mutex);
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if ((s->resource_setup_new) &&
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!(s->resource_setup_old)) {
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spin_unlock_irqrestore(&s->lock, flags);
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mutex_unlock(&s->ops_mutex);
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continue;
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} else if (!(s->resource_setup_old))
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s->resource_setup_old = 1;
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spin_unlock_irqrestore(&s->lock, flags);
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mutex_unlock(&s->ops_mutex);
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switch (adj->Resource) {
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case RES_MEMORY_RANGE:
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@ -208,9 +206,9 @@ static int pcmcia_adjust_resource_info(adjust_t *adj)
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* last call to adjust_resource_info, we
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* always need to assume this is the latest
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* one... */
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spin_lock_irqsave(&s->lock, flags);
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mutex_lock(&s->ops_mutex);
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s->resource_setup_done = 1;
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spin_unlock_irqrestore(&s->lock, flags);
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mutex_unlock(&s->ops_mutex);
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}
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}
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}
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@ -470,7 +468,6 @@ static int bind_request(struct pcmcia_socket *s, bind_info_t *bind_info)
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struct pcmcia_driver *p_drv;
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struct pcmcia_device *p_dev;
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int ret = 0;
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unsigned long flags;
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s = pcmcia_get_socket(s);
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if (!s)
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@ -490,7 +487,7 @@ static int bind_request(struct pcmcia_socket *s, bind_info_t *bind_info)
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goto err_put_driver;
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}
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spin_lock_irqsave(&pcmcia_dev_list_lock, flags);
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mutex_lock(&s->ops_mutex);
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list_for_each_entry(p_dev, &s->devices_list, socket_device_list) {
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if (p_dev->func == bind_info->function) {
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if ((p_dev->dev.driver == &p_drv->drv)) {
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@ -499,7 +496,7 @@ static int bind_request(struct pcmcia_socket *s, bind_info_t *bind_info)
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* registered, and it was registered
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* by userspace before, we need to
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* return the "instance". */
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spin_unlock_irqrestore(&pcmcia_dev_list_lock, flags);
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mutex_unlock(&s->ops_mutex);
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bind_info->instance = p_dev;
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ret = -EBUSY;
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goto err_put_module;
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@ -507,7 +504,7 @@ static int bind_request(struct pcmcia_socket *s, bind_info_t *bind_info)
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/* the correct driver managed to bind
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* itself magically to the correct
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* device. */
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spin_unlock_irqrestore(&pcmcia_dev_list_lock, flags);
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mutex_unlock(&s->ops_mutex);
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p_dev->cardmgr = p_drv;
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ret = 0;
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goto err_put_module;
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@ -516,12 +513,12 @@ static int bind_request(struct pcmcia_socket *s, bind_info_t *bind_info)
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/* there's already a device available where
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* no device has been bound to yet. So we don't
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* need to register a device! */
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spin_unlock_irqrestore(&pcmcia_dev_list_lock, flags);
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mutex_unlock(&s->ops_mutex);
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goto rescan;
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}
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}
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}
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spin_unlock_irqrestore(&pcmcia_dev_list_lock, flags);
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mutex_unlock(&s->ops_mutex);
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p_dev = pcmcia_device_add(s, bind_info->function);
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if (!p_dev) {
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@ -578,7 +575,6 @@ static int get_device_info(struct pcmcia_socket *s, bind_info_t *bind_info, int
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dev_node_t *node;
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struct pcmcia_device *p_dev;
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struct pcmcia_driver *p_drv;
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unsigned long flags;
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int ret = 0;
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#ifdef CONFIG_CARDBUS
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@ -617,7 +613,7 @@ static int get_device_info(struct pcmcia_socket *s, bind_info_t *bind_info, int
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}
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#endif
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spin_lock_irqsave(&pcmcia_dev_list_lock, flags);
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mutex_lock(&s->ops_mutex);
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list_for_each_entry(p_dev, &s->devices_list, socket_device_list) {
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if (p_dev->func == bind_info->function) {
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p_dev = pcmcia_get_dev(p_dev);
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@ -626,11 +622,11 @@ static int get_device_info(struct pcmcia_socket *s, bind_info_t *bind_info, int
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|||
goto found;
|
||||
}
|
||||
}
|
||||
spin_unlock_irqrestore(&pcmcia_dev_list_lock, flags);
|
||||
mutex_unlock(&s->ops_mutex);
|
||||
return -ENODEV;
|
||||
|
||||
found:
|
||||
spin_unlock_irqrestore(&pcmcia_dev_list_lock, flags);
|
||||
mutex_unlock(&s->ops_mutex);
|
||||
|
||||
p_drv = to_pcmcia_drv(p_dev->dev.driver);
|
||||
if (p_drv && !p_dev->_locked) {
|
||||
|
|
|
|||
|
|
@ -23,14 +23,12 @@
|
|||
|
||||
static int static_init(struct pcmcia_socket *s)
|
||||
{
|
||||
unsigned long flags;
|
||||
|
||||
/* the good thing about SS_CAP_STATIC_MAP sockets is
|
||||
* that they don't need a resource database */
|
||||
|
||||
spin_lock_irqsave(&s->lock, flags);
|
||||
mutex_lock(&s->ops_mutex);
|
||||
s->resource_setup_done = 1;
|
||||
spin_unlock_irqrestore(&s->lock, flags);
|
||||
mutex_unlock(&s->ops_mutex);
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
|
|
|||
|
|
@ -189,16 +189,15 @@ static ssize_t pccard_store_resource(struct device *dev,
|
|||
struct device_attribute *attr,
|
||||
const char *buf, size_t count)
|
||||
{
|
||||
unsigned long flags;
|
||||
struct pcmcia_socket *s = to_socket(dev);
|
||||
|
||||
if (!count)
|
||||
return -EINVAL;
|
||||
|
||||
spin_lock_irqsave(&s->lock, flags);
|
||||
mutex_lock(&s->ops_mutex);
|
||||
if (!s->resource_setup_done)
|
||||
s->resource_setup_done = 1;
|
||||
spin_unlock_irqrestore(&s->lock, flags);
|
||||
mutex_unlock(&s->ops_mutex);
|
||||
|
||||
mutex_lock(&s->skt_mutex);
|
||||
if ((s->callback) &&
|
||||
|
|
|
|||
|
|
@ -134,7 +134,6 @@ struct pccard_operations {
|
|||
|
||||
struct pcmcia_socket {
|
||||
struct module *owner;
|
||||
spinlock_t lock;
|
||||
socket_state_t socket;
|
||||
u_int state;
|
||||
u_int suspended_state; /* state before suspend */
|
||||
|
|
@ -201,10 +200,12 @@ struct pcmcia_socket {
|
|||
struct task_struct *thread;
|
||||
struct completion thread_done;
|
||||
unsigned int thread_events;
|
||||
/* protects socket h/w state */
|
||||
|
||||
/* For the non-trivial interaction between these locks,
|
||||
* see Documentation/pcmcia/locking.txt */
|
||||
struct mutex skt_mutex;
|
||||
/* protects PCMCIA state */
|
||||
struct mutex ops_mutex;
|
||||
|
||||
/* protects thread_events */
|
||||
spinlock_t thread_lock;
|
||||
|
||||
|
|
|
|||
Loading…
Reference in a new issue