target/linux/bcm27xx/patches-5.4/950-0695-media-bcm2835-unicam-Fix-reference-counting-in-unica.patch

   1 From 3681c556d79797f132e18973611a14681ed47f76 Mon Sep 17 00:00:00 2001
   2 From: Dave Stevenson <dave.stevenson@raspberrypi.com>
   3 Date: Thu, 30 Apr 2020 09:52:50 +0100
   4 Subject: [PATCH] media: bcm2835-unicam: Fix reference counting in
   5  unicam_open
   6
   7 The reference counting of node->open was only incremented after
   8 a check that the node was v4l2_fh_is_singular_file, which resulted
   9 in the counting going wrong and s_power not being called at an
  10 appropriate time.
  11
  12 Signed-off-by: Dave Stevenson <dave.stevenson@raspberrypi.com>
  13 ---
  14  drivers/media/platform/bcm2835/bcm2835-unicam.c | 4 +++-
  15  1 file changed, 3 insertions(+), 1 deletion(-)
  16
  17 --- a/drivers/media/platform/bcm2835/bcm2835-unicam.c
  18 +++ b/drivers/media/platform/bcm2835/bcm2835-unicam.c
  19 @@ -2170,16 +2170,18 @@ static int unicam_open(struct file *file
  20                 goto unlock;
  21         }
  22
  23 +       node->open++;
  24 +
  25         if (!v4l2_fh_is_singular_file(file))
  26                 goto unlock;
  27
  28         ret = v4l2_subdev_call(dev->sensor, core, s_power, 1);
  29         if (ret < 0 && ret != -ENOIOCTLCMD) {
  30                 v4l2_fh_release(file);
  31 +               node->open--;
  32                 goto unlock;
  33         }
  34
  35 -       node->open++;
  36         ret = 0;
  37
  38  unlock: