V4L/DVB (6581): Fix: avoids negative vma usage count

Signed-off-by: Mauro Carvalho Chehab <mchehab@infradead.org>
git-mirror · Dec 11, 2007 · 63337dd · 63337dd
1 parent 33f7771
commit 63337dd
Showing 1 changed file with 3 additions and 1 deletion.
diff --git a/drivers/media/video/em28xx/em28xx-video.c b/drivers/media/video/em28xx/em28xx-video.c
@@ -571,7 +571,9 @@ static void em28xx_vm_close(struct vm_area_struct *vma)
 {
 	/* NOTE: buffers are not freed here */
 	struct em28xx_frame_t *f = vma->vm_private_data;
-	f->vma_use_count--;
+
+	if (f->vma_use_count)
+		f->vma_use_count--;
 }
 
 static struct vm_operations_struct em28xx_vm_ops = {