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ALSA: hda - Workaround for unbalanced i915 power refcount by concurrent probe

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The recent addition of on-demand i915 audio component binding in the
codec driver seems leading to the unbalanced i915 power refcount,
according to Intel CI tests.  Typically, it gets a kernel WARNING
like:
  WARNING: CPU: 3 PID: 173 at sound/hda/hdac_i915.c:91 snd_hdac_display_power+0xf1/0x110 [snd_hda_core]()
  Call Trace:
   [<ffffffff813fef15>] dump_stack+0x67/0x92
   [<ffffffff81078a21>] warn_slowpath_common+0x81/0xc0
   [<ffffffff81078b15>] warn_slowpath_null+0x15/0x20
   [<ffffffffa00f77e1>] snd_hdac_display_power+0xf1/0x110 [snd_hda_core]
   [<ffffffffa015039d>] azx_intel_link_power+0xd/0x10 [snd_hda_intel]
   [<ffffffffa011e32a>] azx_link_power+0x1a/0x30 [snd_hda_codec]
   [<ffffffffa00f21f9>] snd_hdac_link_power+0x29/0x40 [snd_hda_core]
   [<ffffffffa01192a6>] hda_codec_runtime_suspend+0x76/0xa0 [snd_hda_codec]
   .....

The scenario is like below:
- HD-audio driver and i915 driver are probed concurrently at the
  (almost) same time; HDA bus tries to bind with i915, but it fails
  because i915 initialization is still being processed.
- Later on, HD-audio probes the HDMI codec, where it again tries to
  bind with i915.  At this time, it succeeds.
- At finishing the probe of HDA, it decreases the refcount as if it
  were already bound at the bus probe, since the component is bound
  now.  This triggers a kernel WARNING due to the unbalance.

As a workaround, in this patch, we just disable the on-demand i915
component binding in the codec driver.  This essentially reverts back
to the state of 4.4 kernel.

We know that this is no real solution, but it's a minimalistic simple
change that can be applied to 4.5.x kernel as stable.

Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=94566
Reported-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Cc: <stable@vger.kernel.org> # v4.5
Signed-off-by: Takashi Iwai <tiwai@suse.de>
This commit is contained in:
Takashi Iwai 2016-03-19 10:40:21 +01:00
parent 93a9ff1517
commit 7169701ad3
1 changed files with 6 additions and 0 deletions
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6
sound/pci/hda/patch_hdmi.c
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@ -2258,9 +2258,15 @@ static int patch_generic_hdmi(struct hda_codec *codec)
/* Try to bind with i915 for Intel HSW+ codecs (if not done yet) */
if ((codec->core.vendor_id >> 16) == 0x8086 &&
is_haswell_plus(codec)) {
#if 0
/* on-demand binding leads to an unbalanced refcount when
* both i915 and hda drivers are probed concurrently;
* disabled temporarily for now
*/
if (!codec->bus->core.audio_component)
if (!snd_hdac_i915_init(&codec->bus->core))
spec->i915_bound = true;
#endif
/* use i915 audio component notifier for hotplug */
if (codec->bus->core.audio_component)
spec->use_acomp_notifier = true;