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 e81478bbe7a1 ("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: Kai Vehmanen kai.vehmanen@linux.intel.com Reviewed-by: Kai Vehmanen kai.vehmanen@linux.intel.com Tested-by: Kai Vehmanen kai.vehmanen@linux.intel.com Link: https://lore.kernel.org/r/20211110210307.1172004-1-kai.vehmanen@linux.intel.... Signed-off-by: Takashi Iwai tiwai@suse.de --- sound/pci/hda/hda_intel.c | 10 +++++++++- 1 file changed, 9 insertions(+), 1 deletion(-)
diff --git a/sound/pci/hda/hda_intel.c b/sound/pci/hda/hda_intel.c index fe51163f2d82..45e85180048c 100644 --- a/sound/pci/hda/hda_intel.c +++ b/sound/pci/hda/hda_intel.c @@ -1347,8 +1347,14 @@ static void azx_free(struct azx *chip) if (hda->freed) return;
- if (azx_has_pm_runtime(chip) && chip->running) + if (azx_has_pm_runtime(chip) && chip->running) { pm_runtime_get_noresume(&pci->dev); + pm_runtime_disable(&pci->dev); + pm_runtime_set_suspended(&pci->dev); + pm_runtime_forbid(&pci->dev); + pm_runtime_dont_use_autosuspend(&pci->dev); + } + chip->running = 0;
azx_del_card_list(chip); @@ -2322,6 +2328,8 @@ static int azx_probe_continue(struct azx *chip) if (azx_has_pm_runtime(chip)) { pm_runtime_use_autosuspend(&pci->dev); pm_runtime_allow(&pci->dev); + pm_runtime_set_active(&pci->dev); + pm_runtime_enable(&pci->dev); pm_runtime_put_autosuspend(&pci->dev); }