From: Mauro Carvalho Chehab <mchehab@infradead.org>
Date: Sat, 10 Nov 2007 13:26:20 +0000 (-0300)
Subject: V4L/DVB (6581): Fix: avoids negative vma usage count
X-Git-Tag: v2.6.24-rc6~97
X-Git-Url: https://err.no/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=63337dd3f5506628e4831b08e39e09d7f1407769;p=linux-2.6

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 d3dd6a0fc8..0906bc5766 100644
--- 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 = {