[PATCH] ASoC: soc-compress: Reposition and add pcm_mutex

[강신형]

   commit a385cc2614c17ba3002b263c0ca47dfbf6395c78 (HEAD -> fix_compr,
   master)
   Author: s47.kang <[1]s47.kang at samsung.com>
   Date:   Fri Dec 2 15:45:16 2022 +0900

       ASoC: soc-compress.c: Reposition and add pcm_mutex.

       If panic_on_warn is set and compress stream(DPCM) is started,
       then kernel panic will occurs because card->pcm_mutex isn't held
   appropriately in
       soc_compr_set_params_fe, soc_compr_open_fe and soc_compr_free_fe.
       So, I reposition and add pcm_mutex to resolve lockdep error.

       Signed-off-by: Shinhyung Kang <[2]s47.kang at samsung.com>

   diff --git a/sound/soc/soc-compress.c b/sound/soc/soc-compress.c
   index 870f13e1d389..7bce5088b455 100644
   --- a/sound/soc/soc-compress.c
   +++ b/sound/soc/soc-compress.c
   @@ -149,6 +149,8 @@ static int soc_compr_open_fe(struct
   snd_compr_stream *cstream)
           if (ret < 0)
                   goto be_err;

   +       mutex_lock_nested(&fe->card->pcm_mutex,
   fe->card->pcm_subclass);
   +
           /* calculate valid and active FE <-> BE dpcms */
           dpcm_process_paths(fe, stream, &list, 1);
           fe->dpcm[stream].runtime = fe_substream->runtime;
   @@ -184,7 +186,6 @@ static int soc_compr_open_fe(struct
   snd_compr_stream *cstream)
           fe->dpcm[stream].state = SND_SOC_DPCM_STATE_OPEN;
           fe->dpcm[stream].runtime_update = SND_SOC_DPCM_UPDATE_NO;

   -       mutex_lock_nested(&fe->card->pcm_mutex,
   fe->card->pcm_subclass);
           snd_soc_runtime_activate(fe, stream);
           mutex_unlock(&fe->card->pcm_mutex);

   @@ -215,7 +216,6 @@ static int soc_compr_free_fe(struct
   snd_compr_stream *cstream)

           mutex_lock_nested(&fe->card->pcm_mutex,
   fe->card->pcm_subclass);
           snd_soc_runtime_deactivate(fe, stream);
   -       mutex_unlock(&fe->card->pcm_mutex);

           fe->dpcm[stream].runtime_update = SND_SOC_DPCM_UPDATE_FE;

   @@ -234,6 +234,8 @@ static int soc_compr_free_fe(struct
   snd_compr_stream *cstream)

           dpcm_be_disconnect(fe, stream);

   +       mutex_unlock(&fe->card->pcm_mutex);
   +
           fe->dpcm[stream].runtime = NULL;

           snd_soc_link_compr_shutdown(cstream, 0);
   @@ -409,8 +411,9 @@ static int soc_compr_set_params_fe(struct
   snd_compr_stream *cstream,
           ret = snd_soc_link_compr_set_params(cstream);
           if (ret < 0)
                   goto out;
   -
   +       mutex_lock_nested(&fe->card->pcm_mutex,
   fe->card->pcm_subclass);
           dpcm_dapm_stream_event(fe, stream, SND_SOC_DAPM_STREAM_START);
   +       mutex_unlock(&fe->card->pcm_mutex);
           fe->dpcm[stream].state = SND_SOC_DPCM_STATE_PREPARE;

    out:


   [cid:cafe_image_0 at s-core.co.kr]

   [update?userid=s47.kang&do=bWFpbElEPTIwMjIxMjAyMDgwMDMyZXBjbXMycDY4ZjU2
   YTZiNDNkN2Q2YTRmMGQyZGU5Mjk1YzBlNGFiNCZyZWNpcGllbnRBZGRyZXNzPWFsc2EtZGV
   2ZWxAYWxzYS1wcm9qZWN0Lm9yZw__]

References

   1. mailto:s47.kang at samsung.com
   2. mailto:s47.kang at samsung.com
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