-----Original Message----- From: Takashi Iwai [mailto:tiwai@suse.de] Sent: Wednesday, July 29, 2015 12:03 AM To: Eoff, Ullysses A Cc: alsa-devel@alsa-project.org; Lee, Zhuo-hao; Yang, Libin; dgreid@chromium.org Subject: Re: [PATCH] ALSA: hda - Fix race between PM ops and HDA init/probe
On Tue, 28 Jul 2015 22:29:56 +0200, U. Artie Eoff wrote:
PM ops could be triggered before HDA is done initializing and cause PM to set HDA controller to D3Hot. This can result in "CORB reset timeout#2, CORBRP = 65535" and "no codecs initialized". Additionally, PM ops can be triggered before azx_probe_continue finishes (async probe). This can result in a NULL deref kernel crash.
To fix this, avoid PM ops if !chip->running.
Signed-off-by: U. Artie Eoff ullysses.a.eoff@intel.com
sound/pci/hda/hda_intel.c | 6 +++--- 1 file changed, 3 insertions(+), 3 deletions(-)
diff --git a/sound/pci/hda/hda_intel.c b/sound/pci/hda/hda_intel.c index 735bdcb04ce8..c38c68f57938 100644 --- a/sound/pci/hda/hda_intel.c +++ b/sound/pci/hda/hda_intel.c @@ -867,7 +867,7 @@ static int azx_suspend(struct device *dev)
chip = card->private_data; hda = container_of(chip, struct hda_intel, chip);
- if (chip->disabled || hda->init_failed)
- if (chip->disabled || hda->init_failed || !chip->running)
This is superfluous, as azx_runtime_idle() returns -EBUSY.
This is the sleep suspend, not runtime. Runtime idle result does not influence sleep pm ops.
return 0;bus = azx_bus(chip); @@ -902,7 +902,7 @@ static int azx_resume(struct device *dev)
chip = card->private_data; hda = container_of(chip, struct hda_intel, chip);
- if (chip->disabled || hda->init_failed)
- if (chip->disabled || hda->init_failed || !chip->running)
Ditto.
Similar here... not runtime.
Takashi
return 0;if (chip->driver_caps & AZX_DCAPS_I915_POWERWELL @@ -1027,7 +1027,7 @@ static int azx_runtime_idle(struct device *dev) return 0;
if (!power_save_controller || !azx_has_pm_runtime(chip) ||
azx_bus(chip)->codec_powered)
azx_bus(chip)->codec_powered || !chip->running)return -EBUSY;
return 0;
-- 2.1.0