From ca9fe1588427f246ad4c389b0170b29a432804b6 Mon Sep 17 00:00:00 2001 From: Julia Lawall Date: Sun, 20 Jun 2010 13:24:35 +0200 Subject: HID: eliminate a double lock in debug code The path around the loop ends with the lock held, so the call to mutex_lock is moved before the beginning of the loop. A simplified version of the semantic match that finds this problem is as follows: (http://coccinelle.lip6.fr/) // @locked@ expression E1; position p; @@ read_lock(E1@p,...); @r exists@ expression x <= locked.E1; expression locked.E1; expression E2; identifier lock; position locked.p,p1,p2; @@ *lock@p1 (E1@p,...); ... when != E1 when != \(x = E2\|&x\) *lock@p2 (E1,...); // Signed-off-by: Julia Lawall Signed-off-by: Jiri Kosina --- drivers/hid/hid-debug.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) (limited to 'drivers/hid') diff --git a/drivers/hid/hid-debug.c b/drivers/hid/hid-debug.c index c94026768570..850d02a7a925 100644 --- a/drivers/hid/hid-debug.c +++ b/drivers/hid/hid-debug.c @@ -949,8 +949,8 @@ static ssize_t hid_debug_events_read(struct file *file, char __user *buffer, int ret = 0, len; DECLARE_WAITQUEUE(wait, current); + mutex_lock(&list->read_mutex); while (ret == 0) { - mutex_lock(&list->read_mutex); if (list->head == list->tail) { add_wait_queue(&list->hdev->debug_wait, &wait); set_current_state(TASK_INTERRUPTIBLE); -- cgit v1.2.3