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ALSA: hda - Fix link power unbalance at device removal 

snd_hdac_link_power() has to be called after unregistering the codec
device.  Otherwise the device might be already runtime-suspended, thus
the refcount goes under zero, triggering a warning like:

  WARNING: CPU: 7 PID: 2014 at sound/hda/hdac_i915.c:63 snd_hdac_display_power+0x106/0x120 [snd_hda_core]()
  CPU: 7 PID: 2014 Comm: modprobe Not tainted 4.1.0-rc7-test+ #1
  Call Trace:
   [<ffffffff81697fe3>] dump_stack+0x4c/0x6e
   [<ffffffff810696da>] warn_slowpath_common+0x8a/0xc0
   [<ffffffff810697ca>] warn_slowpath_null+0x1a/0x20
   [<ffffffffa02dd526>] snd_hdac_display_power+0x106/0x120 [snd_hda_core]
   [<ffffffffa030b422>] azx_intel_link_power+0x12/0x20 [snd_hda_intel]
   [<ffffffffa037139f>] azx_link_power+0x1f/0x30 [snd_hda_codec]
   [<ffffffffa02d89fe>] snd_hdac_link_power+0x2e/0x40 [snd_hda_core]
   [<ffffffffa0368524>] snd_hda_codec_dev_free+0x34/0x50 [snd_hda_codec]
   [<ffffffffa0252061>] __snd_device_free+0x51/0xa0 [snd]
   .....

Signed-off-by: Takashi Iwai <tiwai@suse.de>
This commit is contained in:
Takashi Iwai 2015-06-11 14:02:49 +02:00
parent df203a4e46
commit a457782a1c
1 changed files with 1 additions and 1 deletions
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2
sound/pci/hda/hda_codec.c
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@ -886,8 +886,8 @@ static int snd_hda_codec_dev_free(struct snd_device *device)
struct hda_codec *codec = device->device_data;
codec->in_freeing = 1;
snd_hdac_link_power(&codec->core, false);
snd_hdac_device_unregister(&codec->core);
snd_hdac_link_power(&codec->core, false);
put_device(hda_codec_dev(codec));
return 0;
}