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ALSA: hda - Fix broken PM due to incomplete i915 initialization 

When the initialization of Intel HDMI controller fails due to missing
i915 kernel symbols (e.g. HD-audio is built in while i915 is module),
the driver discontinues the probe.  However, since the probe was done
asynchronously, the driver object still remains, thus the relevant PM
ops are still called at suspend/resume. This results in the bad access
to the incomplete audio card object, eventually leads to Oops or stall
at PM.

This patch adds the missing checks of chip->init_failed flag at each
PM callback in order to fix the problem above.

Bugzilla: https://bugzilla.kernel.org/show_bug.cgi?id=79561
Cc: <stable@vger.kernel.org>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
This commit is contained in:
Takashi Iwai 2014-07-15 15:19:43 +02:00
parent cd50065b3b
commit 4da63c6fc4
1 changed files with 5 additions and 5 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

10
sound/pci/hda/hda_intel.c
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@ -596,7 +596,7 @@ static int azx_suspend(struct device *dev)
struct azx *chip = card->private_data;
struct azx_pcm *p;
if (chip->disabled)
if (chip->disabled || chip->init_failed)
return 0;
snd_power_change_state(card, SNDRV_CTL_POWER_D3hot);
@ -628,7 +628,7 @@ static int azx_resume(struct device *dev)
struct snd_card *card = dev_get_drvdata(dev);
struct azx *chip = card->private_data;
if (chip->disabled)
if (chip->disabled || chip->init_failed)
return 0;
if (chip->driver_caps & AZX_DCAPS_I915_POWERWELL) {
@ -665,7 +665,7 @@ static int azx_runtime_suspend(struct device *dev)
struct snd_card *card = dev_get_drvdata(dev);
struct azx *chip = card->private_data;
if (chip->disabled)
if (chip->disabled || chip->init_failed)
return 0;
if (!(chip->driver_caps & AZX_DCAPS_PM_RUNTIME))
@ -692,7 +692,7 @@ static int azx_runtime_resume(struct device *dev)
struct hda_codec *codec;
int status;
if (chip->disabled)
if (chip->disabled || chip->init_failed)
return 0;
if (!(chip->driver_caps & AZX_DCAPS_PM_RUNTIME))
@ -729,7 +729,7 @@ static int azx_runtime_idle(struct device *dev)
struct snd_card *card = dev_get_drvdata(dev);
struct azx *chip = card->private_data;
if (chip->disabled)
if (chip->disabled || chip->init_failed)
return 0;
if (!power_save_controller ||