target/linux/brcm2708/patches-4.19/950-0293-ASoC-pcm512x-Fix-a-double-unlock-in-pcm512x_digital_.patch

   1 From 26001d54a7f803258b161f25f457ce11523695d7 Mon Sep 17 00:00:00 2001
   2 From: Dan Carpenter <dan.carpenter@oracle.com>
   3 Date: Fri, 21 Dec 2018 12:11:20 +0300
   4 Subject: [PATCH] ASoC: pcm512x: Fix a double unlock in
   5  pcm512x_digital_mute()
   6
   7 [ Upstream commit 28b698b7342c7d5300cfe217cd77ff7d2a55e03d ]
   8
   9 We accidentally call mutex_unlock(&pcm512x->mutex); twice in a row.
  10
  11 I re-wrote the error handling to use "goto unlock;" instead of returning
  12 directly.  Hopefully, it makes the code a little simpler.
  13
  14 Fixes: 3500f1c589e9 ("ASoC: pcm512x: Implement the digital_mute interface")
  15 Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
  16 Reviwed-by: Dimitris Papavasiliou <dpapavas@gmail.com>
  17 Signed-off-by: Mark Brown <broonie@kernel.org>
  18 ---
  19  sound/soc/codecs/pcm512x.c | 11 ++++-------
  20  1 file changed, 4 insertions(+), 7 deletions(-)
  21
  22 --- a/sound/soc/codecs/pcm512x.c
  23 +++ b/sound/soc/codecs/pcm512x.c
  24 @@ -1404,24 +1404,20 @@ static int pcm512x_digital_mute(struct s
  25                 if (ret != 0) {
  26                         dev_err(component->dev,
  27                                 "Failed to set digital mute: %d\n", ret);
  28 -                       mutex_unlock(&pcm512x->mutex);
  29 -                       return ret;
  30 +                       goto unlock;
  31                 }
  32
  33                 regmap_read_poll_timeout(pcm512x->regmap,
  34                                          PCM512x_ANALOG_MUTE_DET,
  35                                          mute_det, (mute_det & 0x3) == 0,
  36                                          200, 10000);
  37 -
  38 -               mutex_unlock(&pcm512x->mutex);
  39         } else {
  40                 pcm512x->mute &= ~0x1;
  41                 ret = pcm512x_update_mute(pcm512x);
  42                 if (ret != 0) {
  43                         dev_err(component->dev,
  44                                 "Failed to update digital mute: %d\n", ret);
  45 -                       mutex_unlock(&pcm512x->mutex);
  46 -                       return ret;
  47 +                       goto unlock;
  48                 }
  49
  50                 regmap_read_poll_timeout(pcm512x->regmap,
  51 @@ -1432,9 +1428,10 @@ static int pcm512x_digital_mute(struct s
  52                                          200, 10000);
  53         }
  54
  55 +unlock:
  56         mutex_unlock(&pcm512x->mutex);
  57
  58 -       return 0;
  59 +       return ret;
  60  }
  61
  62  static int pcm512x_set_tdm_slot(struct snd_soc_dai *dai,