From: Mohan Kumar mkumard@nvidia.com
commit 636aa8807b5780b76609b40cd3d3e1b5a225471c upstream.
With jackpoll_in_suspend flag set, there is a possibility that jack poll worker thread will run even after system suspend was completed. Any register access after system pm callback flow will result in kernel crash as still jack poll worker thread tries to access registers.
To fix the crash issue during system flow, cancel the jack poll worker thread during system pm prepare callback and cancel the worker thread at start of runtime suspend callback and re-schedule at last to avoid any unwarranted access of register by worker thread during suspend flow.
Signed-off-by: Mohan Kumar mkumard@nvidia.com Fixes: b33115bd05af ("ALSA: hda: Jack detection poll in suspend state") Link: https://lore.kernel.org/r/20220811052704.2944-1-mkumard@nvidia.com Signed-off-by: Takashi Iwai tiwai@suse.de Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- sound/pci/hda/hda_codec.c | 14 +++++++++----- 1 file changed, 9 insertions(+), 5 deletions(-)
--- a/sound/pci/hda/hda_codec.c +++ b/sound/pci/hda/hda_codec.c @@ -2935,8 +2935,7 @@ static int hda_codec_runtime_suspend(str if (!codec->card) return 0;
- if (!codec->bus->jackpoll_in_suspend) - cancel_delayed_work_sync(&codec->jackpoll_work); + cancel_delayed_work_sync(&codec->jackpoll_work);
state = hda_call_codec_suspend(codec); if (codec->link_down_at_suspend || @@ -2944,6 +2943,11 @@ static int hda_codec_runtime_suspend(str (state & AC_PWRST_CLK_STOP_OK))) snd_hdac_codec_link_down(&codec->core); snd_hda_codec_display_power(codec, false); + + if (codec->bus->jackpoll_in_suspend && + (dev->power.power_state.event != PM_EVENT_SUSPEND)) + schedule_delayed_work(&codec->jackpoll_work, + codec->jackpoll_interval); return 0; }
@@ -2967,6 +2971,9 @@ static int hda_codec_runtime_resume(stru #ifdef CONFIG_PM_SLEEP static int hda_codec_pm_prepare(struct device *dev) { + struct hda_codec *codec = dev_to_hda_codec(dev); + + cancel_delayed_work_sync(&codec->jackpoll_work); dev->power.power_state = PMSG_SUSPEND; return pm_runtime_suspended(dev); } @@ -2986,9 +2993,6 @@ static void hda_codec_pm_complete(struct
static int hda_codec_pm_suspend(struct device *dev) { - struct hda_codec *codec = dev_to_hda_codec(dev); - - cancel_delayed_work_sync(&codec->jackpoll_work); dev->power.power_state = PMSG_SUSPEND; return pm_runtime_force_suspend(dev); }