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

Signed-off-by: Mauro Carvalho Chehab <mchehab@infradead.org>

diff --git a/drivers/media/video/em28xx/em28xx-video.c b/drivers/media/video/em28xx/em28xx-video.c
index d3dd6a0..0906bc5 100644 (file)
--- 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 = {