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authorDmitry Torokhov <dmitry.torokhov@gmail.com>2011-10-11 01:30:26 (GMT)
committerDmitry Torokhov <dmitry.torokhov@gmail.com>2011-10-11 01:34:55 (GMT)
commit843e784afe164ac8c75a97259d54cf489be74bb9 (patch)
treec8f4e97ef6889c780f698729ddfc5eae5d33ef85 /drivers/input
parent7c5bbb2eb7ad047b53c205b1f500bae7b0a88c06 (diff)
downloadlinux-843e784afe164ac8c75a97259d54cf489be74bb9.tar.xz
Input: serio_raw - perform proper locking when adding clients to list
Make sure we hold serio lock when adding clients to client list so that we do not race with serio_raw_release() removing clients from the same list. Reviewed-by: Wanlong Gao <gaowanlong@cn.fujitsu.com> Signed-off-by: Dmitry Torokhov <dtor@mail.ru>
Diffstat (limited to 'drivers/input')
-rw-r--r--drivers/input/serio/serio_raw.c8
1 files changed, 5 insertions, 3 deletions
diff --git a/drivers/input/serio/serio_raw.c b/drivers/input/serio/serio_raw.c
index 6b57ee3..77ce3a6 100644
--- a/drivers/input/serio/serio_raw.c
+++ b/drivers/input/serio/serio_raw.c
@@ -106,7 +106,10 @@ static int serio_raw_open(struct inode *inode, struct file *file)
file->private_data = client;
kref_get(&serio_raw->kref);
+
+ serio_pause_rx(serio_raw->serio);
list_add_tail(&client->node, &serio_raw->client_list);
+ serio_continue_rx(serio_raw->serio);
out:
mutex_unlock(&serio_raw_mutex);
@@ -138,10 +141,9 @@ static int serio_raw_release(struct inode *inode, struct file *file)
static int serio_raw_fetch_byte(struct serio_raw *serio_raw, char *c)
{
- unsigned long flags;
int empty;
- spin_lock_irqsave(&serio_raw->serio->lock, flags);
+ serio_pause_rx(serio_raw->serio);
empty = serio_raw->head == serio_raw->tail;
if (!empty) {
@@ -149,7 +151,7 @@ static int serio_raw_fetch_byte(struct serio_raw *serio_raw, char *c)
serio_raw->tail = (serio_raw->tail + 1) % SERIO_RAW_QUEUE_LEN;
}
- spin_unlock_irqrestore(&serio_raw->serio->lock, flags);
+ serio_continue_rx(serio_raw->serio);
return !empty;
}