diff options
author | Dominik Brodowski <linux@dominikbrodowski.net> | 2010-01-16 08:14:11 (GMT) |
---|---|---|
committer | Dominik Brodowski <linux@dominikbrodowski.net> | 2010-02-17 16:48:20 (GMT) |
commit | 00ce99ff506a17882747a7d6874e3f5206a99043 (patch) | |
tree | 571f5b106f25f35f326d456123c4af85147c3bce /drivers/pcmcia/ds.c | |
parent | 3d3de32fad19e37695e6649136e4cb17f9d46329 (diff) | |
download | linux-fsl-qoriq-00ce99ff506a17882747a7d6874e3f5206a99043.tar.xz |
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>
Diffstat (limited to 'drivers/pcmcia/ds.c')
-rw-r--r-- | drivers/pcmcia/ds.c | 70 |
1 files changed, 27 insertions, 43 deletions
diff --git a/drivers/pcmcia/ds.c b/drivers/pcmcia/ds.c index 0eb242c..4c40db8 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); |