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authorDominik Brodowski <linux@dominikbrodowski.net>2010-01-16 01:34:06 +0100
committerDominik Brodowski <linux@dominikbrodowski.net>2010-02-17 17:48:18 +0100
commite6e4f397e5d0970ee1bb7a5591ac93b37cfa524a (patch)
tree8e20dc8b8281ee4a6e7782554825212d93983de7 /drivers/pcmcia
parent64d8d46f5f501a19aec4db7ff93faf1b831d05ed (diff)
downloadlinux-e6e4f397e5d0970ee1bb7a5591ac93b37cfa524a.tar.bz2
pcmcia: protect s->device_count
Tested-by: Wolfram Sang <w.sang@pengutronix.de> Signed-off-by: Dominik Brodowski <linux@dominikbrodowski.net>
Diffstat (limited to 'drivers/pcmcia')
-rw-r--r--drivers/pcmcia/ds.c25
1 files changed, 18 insertions, 7 deletions
diff --git a/drivers/pcmcia/ds.c b/drivers/pcmcia/ds.c
index 4f7308df22c8..bcb9ef103427 100644
--- a/drivers/pcmcia/ds.c
+++ b/drivers/pcmcia/ds.c
@@ -265,6 +265,7 @@ 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);
@@ -315,9 +316,11 @@ static int pcmcia_device_probe(struct device *dev)
goto put_module;
}
+ spin_lock_irqsave(&pcmcia_dev_list_lock, flags);
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);
put_module:
if (ret)
@@ -342,10 +345,12 @@ static void pcmcia_card_remove(struct pcmcia_socket *s, struct pcmcia_device *le
"pcmcia_card_remove(%d) %s\n", s->sock,
leftover ? leftover->devname : "");
+ spin_lock_irqsave(&pcmcia_dev_list_lock, flags);
if (!leftover)
s->device_count = 0;
else
s->device_count = 1;
+ spin_unlock_irqrestore(&pcmcia_dev_list_lock, flags);
/* unregister all pcmcia_devices registered with this socket, except leftover */
list_for_each_entry_safe(p_dev, tmp, &s->devices_list, socket_device_list) {
@@ -382,7 +387,7 @@ static int pcmcia_device_remove(struct device *dev)
*/
did = dev_get_drvdata(&p_dev->dev);
if (did && (did->match_flags & PCMCIA_DEV_ID_MATCH_DEVICE_NO) &&
- (p_dev->socket->device_count != 0) &&
+ (p_dev->socket->device_count > 0) &&
(p_dev->device_no == 0))
pcmcia_card_remove(p_dev->socket, p_dev);
@@ -512,16 +517,19 @@ struct pcmcia_device *pcmcia_device_add(struct pcmcia_socket *s, unsigned int fu
pr_debug("adding device to %d, function %d\n", s->sock, function);
- /* max of 4 devices per card */
- if (s->device_count == 4)
- goto err_put;
-
p_dev = kzalloc(sizeof(struct pcmcia_device), GFP_KERNEL);
if (!p_dev)
goto err_put;
- p_dev->socket = s;
+ spin_lock_irqsave(&pcmcia_dev_list_lock, flags);
p_dev->device_no = (s->device_count++);
+ spin_unlock_irqrestore(&pcmcia_dev_list_lock, flags);
+
+ /* max of 4 devices per card */
+ if (p_dev->device_no >= 4)
+ goto err_free;
+
+ p_dev->socket = s;
p_dev->func = function;
p_dev->dev.bus = &pcmcia_bus_type;
@@ -586,9 +594,12 @@ struct pcmcia_device *pcmcia_device_add(struct pcmcia_socket *s, unsigned int fu
spin_unlock_irqrestore(&pcmcia_dev_list_lock, flags);
err_free:
+ spin_lock_irqsave(&pcmcia_dev_list_lock, flags);
+ s->device_count--;
+ spin_unlock_irqrestore(&pcmcia_dev_list_lock, flags);
+
kfree(p_dev->devname);
kfree(p_dev);
- s->device_count--;
err_put:
mutex_unlock(&device_add_lock);
pcmcia_put_socket(s);