From: Julia Lawall <julia@xxxxxxx> If ov is NULL, it will not be possible to take the lock in the first place, so move the test up earlier. The semantic match that finds the problem is as follows: (http://coccinelle.lip6.fr/) // <smpl> @r exists@ expression E, E1; identifier f; statement S1,S3; iterator iter; @@ if ((E == NULL && ...) || ...) { ... when != false ((E == NULL && ...) || ...) when != true ((E != NULL && ...) || ...) when != iter(E,...) S1 when != E = E1 ( sizeof(E->f) | * E->f ) ... when any return ...; } else S3 // </smpl> Signed-off-by: Julia Lawall <julia@xxxxxxx> --- drivers/media/video/ov511.c | 8 +++----- 1 files changed, 3 insertions(+), 5 deletions(-) diff --git a/drivers/media/video/ov511.c b/drivers/media/video/ov511.c index e0bce8d..2357218 100644 --- a/drivers/media/video/ov511.c +++ b/drivers/media/video/ov511.c @@ -5913,14 +5913,12 @@ ov51x_disconnect(struct usb_interface *intf) PDEBUG(3, ""); + if (!ov) + return; + mutex_lock(&ov->lock); usb_set_intfdata (intf, NULL); - if (!ov) { - mutex_unlock(&ov->lock); - return; - } - /* Free device number */ ov511_devused &= ~(1 << ov->nr); -- To unsubscribe from this list: send the line "unsubscribe linux-media" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
