ALSA: hda - Handle pm failure during hotplug
Obtaining the runtime pm wakeref can fail, especially in a hotplug scenario where i915.ko has been unloaded. If we do not catch the failure, we end up with an unbalanced pm. v2 additions by tiwai: hdmi_present_sense() checks the return value and handle only a negative error case and bails out only if it's really still suspended. Also, snd_hda_power_down() is called at the error path so that the refcount is balanced. Along with it, the spec->pcm_lock is taken outside hdmi_present_sense() in the caller side, so that it won't cause deadlock at reentrace via runtime resume. v3 fix by tiwai: Missing linux/pm_runtime.h is included. References: 222bde03 ("ALSA: hda - Fix mutex deadlock at HDMI/DP hotplug") Signed-off-by:Chris Wilson <chris@chris-wilson.co.uk> Cc: <stable@vger.kernel.org> Signed-off-by:
Takashi Iwai <tiwai@suse.de>
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c9a4c638
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