1. 20 Apr, 2020 1 commit
    • Jerome Brunet's avatar
      ASoC: meson: axg-card: fix codec-to-codec link setup · 11642842
      Jerome Brunet authored
      Since the addition of commit 9b5db059 ("ASoC: soc-pcm: dpcm: Only allow
      playback/capture if supported"), meson-axg cards which have codec-to-codec
      links fail to init and Oops:
      
        Unable to handle kernel NULL pointer dereference at virtual address 0000000000000128
        Internal error: Oops: 96000044 [#1] PREEMPT SMP
        CPU: 3 PID: 1582 Comm: arecord Not tainted 5.7.0-rc1
        pc : invalidate_paths_ep+0x30/0xe0
        lr : snd_soc_dapm_dai_get_connected_widgets+0x170/0x1a8
        Call trace:
         invalidate_paths_ep+0x30/0xe0
         snd_soc_dapm_dai_get_connected_widgets+0x170/0x1a8
         dpcm_path_get+0x38/0xd0
         dpcm_fe_dai_open+0x70/0x920
         snd_pcm_open_substream+0x564/0x840
         snd_pcm_open+0xfc/0x228
         snd_pcm_capture_open+0x4c/0x78
         snd_open+0xac/0x1a8
         ...
      
      While initiliazing the links, ASoC treats the codec-to-codec links of this
      card type as a DPCM backend. This error eventually leads to the Oops.
      
      Most of the card driver code is shared between DPCM backends and
      codec-to-codec links. The property "no_pcm" marking DCPM BE was left set on
      codec-to-codec links, leading to this problem. This commit fixes that.
      
      Fixes: 0a8f1117 ("ASoC: meson: axg-card: add basic codec-to-codec link support")
      Signed-off-by: default avatarJerome Brunet <jbrunet@baylibre.com>
      Link: https://lore.kernel.org/r/20200420114511.450560-2-jbrunet@baylibre.comSigned-off-by: default avatarMark Brown <broonie@kernel.org>
      11642842
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