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Commit 4f66a9ef authored by Takashi Iwai's avatar Takashi Iwai
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ALSA: hda: intel: More comprehensive PM runtime setup for controller driver



Currently we haven't explicitly enable and allow/forbid the runtime PM
at the probe and the remove phases of HD-audio controller driver, and
this was the reason of a GPF mentioned in the commit e81478bb
("ALSA: hda: fix general protection fault in azx_runtime_idle");
namely, even after the resources are released, the runtime PM might be
still invoked by the bound graphics driver during the remove of the
controller driver.  Although we've fixed it by clearing the drvdata
reference, it'd be also better to cover the runtime PM issue more
properly.

This patch adds a few more pm_runtime_*() calls at the probe and the
remove time for setting and cleaning up the runtime PM.  Particularly,
now more explicitly pm_runtime_enable() and _disable() get called as
well as pm_runtime_forbid() call at the remove callback, so that a
use-after-free should be avoided.

Reported-by: default avatarKai Vehmanen <kai.vehmanen@linux.intel.com>
Reviewed-by: default avatarKai Vehmanen <kai.vehmanen@linux.intel.com>
Tested-by: default avatarKai Vehmanen <kai.vehmanen@linux.intel.com>
Link: https://lore.kernel.org/r/20211110210307.1172004-1-kai.vehmanen@linux.intel.com
Link: https://lore.kernel.org/r/20211115075944.6972-1-tiwai@suse.de


Signed-off-by: default avatarTakashi Iwai <tiwai@suse.de>
parent fa55b7dc
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