1. 13 Oct, 2020 1 commit
    • Kai Vehmanen's avatar
      ALSA: hda/hdmi: fix incorrect locking in hdmi_pcm_close · ce1558c2
      Kai Vehmanen authored
      A race exists between closing a PCM and update of ELD data. In
      hdmi_pcm_close(), hinfo->nid value is modified without taking
      spec->pcm_lock. If this happens concurrently while processing an ELD
      update in hdmi_pcm_setup_pin(), converter assignment may be done
      incorrectly.
      
      This bug was found by hitting a WARN_ON in snd_hda_spdif_ctls_assign()
      in a HDMI receiver connection stress test:
      
      [2739.684569] WARNING: CPU: 5 PID: 2090 at sound/pci/hda/patch_hdmi.c:1898 check_non_pcm_per_cvt+0x41/0x50 [snd_hda_codec_hdmi]
      ...
      [2739.684707] Call Trace:
      [2739.684720]  update_eld+0x121/0x5a0 [snd_hda_codec_hdmi]
      [2739.684736]  hdmi_present_sense+0x21e/0x3b0 [snd_hda_codec_hdmi]
      [2739.684750]  check_presence_and_report+0x81/0xd0 [snd_hda_codec_hdmi]
      [2739.684842]  intel_audio_codec_enable+0x122/0x190 [i915]
      
      Fixes: 42b29870 ("ALSA: hda - hdmi playback without monitor in dynamic pcm bind mode")
      Signed-off-by: default avatarKai Vehmanen <kai.vehmanen@linux.intel.com>
      Cc: <stable@vger.kernel.org>
      Link: https://lore.kernel.org/r/20201013152628.920764-1-kai.vehmanen@linux.intel.comSigned-off-by: default avatarTakashi Iwai <tiwai@suse.de>
      ce1558c2
  2. 12 Oct, 2020 5 commits
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