From 00ce99ff506a17882747a7d6874e3f5206a99043 Mon Sep 17 00:00:00 2001 From: Dominik Brodowski Date: Sat, 16 Jan 2010 09:14:11 +0100 Subject: [PATCH] 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 Signed-off-by: Dominik Brodowski --- drivers/pcmcia/cs.c | 2 - drivers/pcmcia/cs_internal.h | 2 - drivers/pcmcia/ds.c | 70 ++++++++++++++--------------------- drivers/pcmcia/pcmcia_ioctl.c | 36 ++++++++---------- drivers/pcmcia/rsrc_mgr.c | 6 +-- drivers/pcmcia/socket_sysfs.c | 5 +-- include/pcmcia/ss.h | 7 ++-- 7 files changed, 51 insertions(+), 77 deletions(-) diff --git a/drivers/pcmcia/cs.c b/drivers/pcmcia/cs.c index cc0ba8aef59e..13277eebe46a 100644 --- a/drivers/pcmcia/cs.c +++ b/drivers/pcmcia/cs.c @@ -175,8 +175,6 @@ int pcmcia_register_socket(struct pcmcia_socket *socket) dev_dbg(&socket->dev, "pcmcia_register_socket(0x%p)\n", socket->ops); - spin_lock_init(&socket->lock); - /* try to obtain a socket number [yes, it gets ugly if we * register more than 2^sizeof(unsigned int) pcmcia * sockets... but the socket number is deprecated diff --git a/drivers/pcmcia/cs_internal.h b/drivers/pcmcia/cs_internal.h index 76ac4444f0e0..bd386d77845e 100644 --- a/drivers/pcmcia/cs_internal.h +++ b/drivers/pcmcia/cs_internal.h @@ -182,8 +182,6 @@ int pccard_get_tuple_data(struct pcmcia_socket *s, tuple_t *tuple); #ifdef CONFIG_PCMCIA_IOCTL /* ds.c */ -extern spinlock_t pcmcia_dev_list_lock; - extern struct pcmcia_device *pcmcia_get_dev(struct pcmcia_device *p_dev); extern void pcmcia_put_dev(struct pcmcia_device *p_dev); diff --git a/drivers/pcmcia/ds.c b/drivers/pcmcia/ds.c index 0eb242cbed17..4c40db8889d9 100644 --- a/drivers/pcmcia/ds.c +++ b/drivers/pcmcia/ds.c @@ -42,8 +42,6 @@ MODULE_DESCRIPTION("PCMCIA Driver Services"); MODULE_LICENSE("GPL"); -spinlock_t pcmcia_dev_list_lock; - /*====================================================================*/ static void pcmcia_check_driver(struct pcmcia_driver *p_drv) @@ -265,7 +263,6 @@ static int pcmcia_device_probe(struct device *dev) struct pcmcia_device_id *did; struct pcmcia_socket *s; cistpl_config_t cis_config; - unsigned long flags; int ret = 0; dev = get_device(dev); @@ -316,11 +313,11 @@ static int pcmcia_device_probe(struct device *dev) goto put_module; } - spin_lock_irqsave(&pcmcia_dev_list_lock, flags); + mutex_lock(&s->ops_mutex); if (did && (did->match_flags & PCMCIA_DEV_ID_MATCH_DEVICE_NO) && (p_dev->socket->device_count == 1) && (p_dev->device_no == 0)) pcmcia_add_device_later(p_dev->socket, 0); - spin_unlock_irqrestore(&pcmcia_dev_list_lock, flags); + mutex_unlock(&s->ops_mutex); put_module: if (ret) @@ -339,28 +336,27 @@ static void pcmcia_card_remove(struct pcmcia_socket *s, struct pcmcia_device *le { struct pcmcia_device *p_dev; struct pcmcia_device *tmp; - unsigned long flags; dev_dbg(leftover ? &leftover->dev : &s->dev, "pcmcia_card_remove(%d) %s\n", s->sock, leftover ? leftover->devname : ""); - spin_lock_irqsave(&pcmcia_dev_list_lock, flags); + mutex_lock(&s->ops_mutex); if (!leftover) s->device_count = 0; else s->device_count = 1; - spin_unlock_irqrestore(&pcmcia_dev_list_lock, flags); + mutex_unlock(&s->ops_mutex); /* unregister all pcmcia_devices registered with this socket, except leftover */ list_for_each_entry_safe(p_dev, tmp, &s->devices_list, socket_device_list) { if (p_dev == leftover) continue; - spin_lock_irqsave(&pcmcia_dev_list_lock, flags); + mutex_lock(&s->ops_mutex); list_del(&p_dev->socket_device_list); p_dev->_removed = 1; - spin_unlock_irqrestore(&pcmcia_dev_list_lock, flags); + mutex_unlock(&s->ops_mutex); dev_dbg(&p_dev->dev, "unregistering device\n"); device_unregister(&p_dev->dev); @@ -507,7 +503,6 @@ static DEFINE_MUTEX(device_add_lock); struct pcmcia_device *pcmcia_device_add(struct pcmcia_socket *s, unsigned int function) { struct pcmcia_device *p_dev, *tmp_dev; - unsigned long flags; s = pcmcia_get_socket(s); if (!s) @@ -521,9 +516,9 @@ struct pcmcia_device *pcmcia_device_add(struct pcmcia_socket *s, unsigned int fu if (!p_dev) goto err_put; - spin_lock_irqsave(&pcmcia_dev_list_lock, flags); + mutex_lock(&s->ops_mutex); p_dev->device_no = (s->device_count++); - spin_unlock_irqrestore(&pcmcia_dev_list_lock, flags); + mutex_unlock(&s->ops_mutex); /* max of 4 devices per card */ if (p_dev->device_no >= 4) @@ -546,7 +541,7 @@ struct pcmcia_device *pcmcia_device_add(struct pcmcia_socket *s, unsigned int fu goto err_free; dev_dbg(&p_dev->dev, "devname is %s\n", p_dev->devname); - spin_lock_irqsave(&pcmcia_dev_list_lock, flags); + mutex_lock(&s->ops_mutex); /* * p_dev->function_config must be the same for all card functions. @@ -564,7 +559,7 @@ struct pcmcia_device *pcmcia_device_add(struct pcmcia_socket *s, unsigned int fu /* Add to the list in pcmcia_bus_socket */ list_add(&p_dev->socket_device_list, &s->devices_list); - spin_unlock_irqrestore(&pcmcia_dev_list_lock, flags); + mutex_unlock(&s->ops_mutex); if (!p_dev->function_config) { dev_dbg(&p_dev->dev, "creating config_t\n"); @@ -589,14 +584,14 @@ struct pcmcia_device *pcmcia_device_add(struct pcmcia_socket *s, unsigned int fu return p_dev; err_unreg: - spin_lock_irqsave(&pcmcia_dev_list_lock, flags); + mutex_lock(&s->ops_mutex); list_del(&p_dev->socket_device_list); - spin_unlock_irqrestore(&pcmcia_dev_list_lock, flags); + mutex_unlock(&s->ops_mutex); err_free: - spin_lock_irqsave(&pcmcia_dev_list_lock, flags); + mutex_lock(&s->ops_mutex); s->device_count--; - spin_unlock_irqrestore(&pcmcia_dev_list_lock, flags); + mutex_unlock(&s->ops_mutex); kfree(p_dev->devname); kfree(p_dev); @@ -650,13 +645,12 @@ static void pcmcia_delayed_add_device(struct work_struct *work) struct pcmcia_socket *s = container_of(work, struct pcmcia_socket, device_add); u8 mfc_pfc; - unsigned long flags; - spin_lock_irqsave(&pcmcia_dev_list_lock, flags); + mutex_lock(&s->ops_mutex); mfc_pfc = s->pcmcia_state.mfc_pfc; s->pcmcia_state.device_add_pending = 0; s->pcmcia_state.mfc_pfc = 0; - spin_unlock_irqrestore(&pcmcia_dev_list_lock, flags); + mutex_unlock(&s->ops_mutex); dev_dbg(&s->dev, "adding additional device to %d\n", s->sock); pcmcia_device_add(s, mfc_pfc); @@ -677,15 +671,14 @@ static void pcmcia_bus_rescan(struct pcmcia_socket *skt, int new_cis) { int no_devices = 0; int ret = 0; - unsigned long flags; /* must be called with skt_mutex held */ dev_dbg(&skt->dev, "re-scanning socket %d\n", skt->sock); - spin_lock_irqsave(&pcmcia_dev_list_lock, flags); + mutex_lock(&skt->ops_mutex); if (list_empty(&skt->devices_list)) no_devices = 1; - spin_unlock_irqrestore(&pcmcia_dev_list_lock, flags); + mutex_unlock(&skt->ops_mutex); /* If this is because of a CIS override, start over */ if (new_cis && !no_devices) @@ -769,11 +762,9 @@ static int pcmcia_load_firmware(struct pcmcia_device *dev, char * filename) if (old_funcs > no_funcs) pcmcia_card_remove(s, dev); else if (no_funcs > old_funcs) { - unsigned long flags; - - spin_lock_irqsave(&pcmcia_dev_list_lock, flags); + mutex_lock(&s->ops_mutex); pcmcia_add_device_later(s, 1); - spin_unlock_irqrestore(&pcmcia_dev_list_lock, flags); + mutex_unlock(&s->ops_mutex); } } release: @@ -1248,7 +1239,6 @@ static int pcmcia_bus_suspend(struct pcmcia_socket *skt) static int ds_event(struct pcmcia_socket *skt, event_t event, int priority) { struct pcmcia_socket *s = pcmcia_get_socket(skt); - unsigned long flags; if (!s) { dev_printk(KERN_ERR, &skt->dev, @@ -1262,9 +1252,9 @@ static int ds_event(struct pcmcia_socket *skt, event_t event, int priority) switch (event) { case CS_EVENT_CARD_REMOVAL: - spin_lock_irqsave(&pcmcia_dev_list_lock, flags); + mutex_lock(&s->ops_mutex); s->pcmcia_state.present = 0; - spin_unlock_irqrestore(&pcmcia_dev_list_lock, flags); + mutex_unlock(&s->ops_mutex); pcmcia_card_remove(skt, NULL); handle_event(skt, event); mutex_lock(&s->ops_mutex); @@ -1273,10 +1263,8 @@ static int ds_event(struct pcmcia_socket *skt, event_t event, int priority) break; case CS_EVENT_CARD_INSERTION: - spin_lock_irqsave(&pcmcia_dev_list_lock, flags); - s->pcmcia_state.present = 1; - spin_unlock_irqrestore(&pcmcia_dev_list_lock, flags); mutex_lock(&s->ops_mutex); + s->pcmcia_state.present = 1; destroy_cis_cache(s); /* to be on the safe side... */ mutex_unlock(&s->ops_mutex); pcmcia_card_add(skt); @@ -1321,13 +1309,12 @@ struct pcmcia_device *pcmcia_dev_present(struct pcmcia_device *_p_dev) { struct pcmcia_device *p_dev; struct pcmcia_device *ret = NULL; - unsigned long flags; p_dev = pcmcia_get_dev(_p_dev); if (!p_dev) return NULL; - spin_lock_irqsave(&pcmcia_dev_list_lock, flags); + mutex_lock(&p_dev->socket->ops_mutex); if (!p_dev->socket->pcmcia_state.present) goto out; @@ -1342,7 +1329,7 @@ struct pcmcia_device *pcmcia_dev_present(struct pcmcia_device *_p_dev) ret = p_dev; out: - spin_unlock_irqrestore(&pcmcia_dev_list_lock, flags); + mutex_unlock(&p_dev->socket->ops_mutex); pcmcia_put_dev(p_dev); return ret; } @@ -1406,14 +1393,13 @@ static void pcmcia_bus_remove_socket(struct device *dev, struct class_interface *class_intf) { struct pcmcia_socket *socket = dev_get_drvdata(dev); - unsigned long flags; if (!socket) return; - spin_lock_irqsave(&pcmcia_dev_list_lock, flags); + mutex_lock(&socket->ops_mutex); socket->pcmcia_state.dead = 1; - spin_unlock_irqrestore(&pcmcia_dev_list_lock, flags); + mutex_unlock(&socket->ops_mutex); pccard_register_pcmcia(socket, NULL); @@ -1455,8 +1441,6 @@ static int __init init_pcmcia_bus(void) { int ret; - spin_lock_init(&pcmcia_dev_list_lock); - ret = bus_register(&pcmcia_bus_type); if (ret < 0) { printk(KERN_WARNING "pcmcia: bus_register error: %d\n", ret); diff --git a/drivers/pcmcia/pcmcia_ioctl.c b/drivers/pcmcia/pcmcia_ioctl.c index f73fd5beaa37..db2e3db8008b 100644 --- a/drivers/pcmcia/pcmcia_ioctl.c +++ b/drivers/pcmcia/pcmcia_ioctl.c @@ -62,16 +62,15 @@ static struct pcmcia_device *get_pcmcia_device(struct pcmcia_socket *s, unsigned int function) { struct pcmcia_device *p_dev = NULL; - unsigned long flags; - spin_lock_irqsave(&pcmcia_dev_list_lock, flags); + mutex_lock(&s->ops_mutex); list_for_each_entry(p_dev, &s->devices_list, socket_device_list) { if (p_dev->func == function) { - spin_unlock_irqrestore(&pcmcia_dev_list_lock, flags); + mutex_unlock(&s->ops_mutex); return pcmcia_get_dev(p_dev); } } - spin_unlock_irqrestore(&pcmcia_dev_list_lock, flags); + mutex_unlock(&s->ops_mutex); return NULL; } @@ -169,7 +168,6 @@ static int pcmcia_adjust_resource_info(adjust_t *adj) { struct pcmcia_socket *s; int ret = -ENOSYS; - unsigned long flags; down_read(&pcmcia_socket_list_rwsem); list_for_each_entry(s, &pcmcia_socket_list, socket_list) { @@ -182,14 +180,14 @@ static int pcmcia_adjust_resource_info(adjust_t *adj) /* you can't use the old interface if the new * one was used before */ - spin_lock_irqsave(&s->lock, flags); + mutex_lock(&s->ops_mutex); if ((s->resource_setup_new) && !(s->resource_setup_old)) { - spin_unlock_irqrestore(&s->lock, flags); + mutex_unlock(&s->ops_mutex); continue; } else if (!(s->resource_setup_old)) s->resource_setup_old = 1; - spin_unlock_irqrestore(&s->lock, flags); + mutex_unlock(&s->ops_mutex); switch (adj->Resource) { case RES_MEMORY_RANGE: @@ -208,9 +206,9 @@ static int pcmcia_adjust_resource_info(adjust_t *adj) * last call to adjust_resource_info, we * always need to assume this is the latest * one... */ - 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); } } } @@ -470,7 +468,6 @@ static int bind_request(struct pcmcia_socket *s, bind_info_t *bind_info) struct pcmcia_driver *p_drv; struct pcmcia_device *p_dev; int ret = 0; - unsigned long flags; s = pcmcia_get_socket(s); if (!s) @@ -490,7 +487,7 @@ static int bind_request(struct pcmcia_socket *s, bind_info_t *bind_info) goto err_put_driver; } - spin_lock_irqsave(&pcmcia_dev_list_lock, flags); + mutex_lock(&s->ops_mutex); list_for_each_entry(p_dev, &s->devices_list, socket_device_list) { if (p_dev->func == bind_info->function) { if ((p_dev->dev.driver == &p_drv->drv)) { @@ -499,7 +496,7 @@ static int bind_request(struct pcmcia_socket *s, bind_info_t *bind_info) * registered, and it was registered * by userspace before, we need to * return the "instance". */ - spin_unlock_irqrestore(&pcmcia_dev_list_lock, flags); + mutex_unlock(&s->ops_mutex); bind_info->instance = p_dev; ret = -EBUSY; goto err_put_module; @@ -507,7 +504,7 @@ static int bind_request(struct pcmcia_socket *s, bind_info_t *bind_info) /* the correct driver managed to bind * itself magically to the correct * device. */ - spin_unlock_irqrestore(&pcmcia_dev_list_lock, flags); + mutex_unlock(&s->ops_mutex); p_dev->cardmgr = p_drv; ret = 0; goto err_put_module; @@ -516,12 +513,12 @@ static int bind_request(struct pcmcia_socket *s, bind_info_t *bind_info) /* there's already a device available where * no device has been bound to yet. So we don't * need to register a device! */ - spin_unlock_irqrestore(&pcmcia_dev_list_lock, flags); + mutex_unlock(&s->ops_mutex); goto rescan; } } } - spin_unlock_irqrestore(&pcmcia_dev_list_lock, flags); + mutex_unlock(&s->ops_mutex); p_dev = pcmcia_device_add(s, bind_info->function); if (!p_dev) { @@ -578,7 +575,6 @@ static int get_device_info(struct pcmcia_socket *s, bind_info_t *bind_info, int dev_node_t *node; struct pcmcia_device *p_dev; struct pcmcia_driver *p_drv; - unsigned long flags; int ret = 0; #ifdef CONFIG_CARDBUS @@ -617,7 +613,7 @@ static int get_device_info(struct pcmcia_socket *s, bind_info_t *bind_info, int } #endif - spin_lock_irqsave(&pcmcia_dev_list_lock, flags); + mutex_lock(&s->ops_mutex); list_for_each_entry(p_dev, &s->devices_list, socket_device_list) { if (p_dev->func == bind_info->function) { p_dev = pcmcia_get_dev(p_dev); @@ -626,11 +622,11 @@ static int get_device_info(struct pcmcia_socket *s, bind_info_t *bind_info, int 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) { diff --git a/drivers/pcmcia/rsrc_mgr.c b/drivers/pcmcia/rsrc_mgr.c index cdd30c180066..b81586622d02 100644 --- a/drivers/pcmcia/rsrc_mgr.c +++ b/drivers/pcmcia/rsrc_mgr.c @@ -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; } diff --git a/drivers/pcmcia/socket_sysfs.c b/drivers/pcmcia/socket_sysfs.c index 1cba9d38d813..e8826df00a36 100644 --- a/drivers/pcmcia/socket_sysfs.c +++ b/drivers/pcmcia/socket_sysfs.c @@ -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) && diff --git a/include/pcmcia/ss.h b/include/pcmcia/ss.h index e756069859b5..cfaccc224b50 100644 --- a/include/pcmcia/ss.h +++ b/include/pcmcia/ss.h @@ -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;