On Mon, 02 Jul 2018 16:10:00 +0200, kbuild test robot wrote:

tree: https://git.kernel.org/pub/scm/linux/kernel/git/tiwai/sound.git for-linus head: b0526c9f124fa2eada1c262743bf09edc3799a20 commit: b0526c9f124fa2eada1c262743bf09edc3799a20 [15/15] ALSA: hda - Handle pm failure during hotplug config: x86_64-randconfig-x010-201826 (attached as .config) compiler: gcc-7 (Debian 7.3.0-16) 7.3.0 reproduce: git checkout b0526c9f124fa2eada1c262743bf09edc3799a20 # save the attached .config to linux build tree make ARCH=x86_64

All errors (new ones prefixed by >>):

In file included from include/linux/init.h:5:0, from sound/pci/hda/patch_hdmi.c:32: sound/pci/hda/patch_hdmi.c: In function 'hdmi_present_sense':

...

...

sound/pci/hda/patch_hdmi.c:1638:18: error: implicit declaration of function 'pm_runtime_suspended'; did you mean 'pm_generic_suspend'? [-Werror=implicit-function-declaration]

  if (ret < 0 && pm_runtime_suspended(hda_codec_dev(codec))) {
                 ^

include/linux/compiler.h:58:30: note: in definition of macro '__trace_if' if (__builtin_constant_p(!!(cond)) ? !!(cond) : \ ^~~~ sound/pci/hda/patch_hdmi.c:1638:3: note: in expansion of macro 'if' if (ret < 0 && pm_runtime_suspended(hda_codec_dev(codec))) { ^~ cc1: some warnings being treated as errors

Looks like the missing inclusion of linux/pm_runtime.h.

The revised patch is below.

Takashi

-- 8< -- From: Chris Wilson chris@chris-wilson.co.uk Subject: [PATCH v3] 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: 222bde03881c ("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 --- sound/pci/hda/patch_hdmi.c | 19 ++++++++++++++----- 1 file changed, 14 insertions(+), 5 deletions(-)

diff --git a/sound/pci/hda/patch_hdmi.c b/sound/pci/hda/patch_hdmi.c index 98e1c411c56a..8a49415aebac 100644 --- a/sound/pci/hda/patch_hdmi.c +++ b/sound/pci/hda/patch_hdmi.c @@ -33,6 +33,7 @@ #include <linux/delay.h> #include <linux/slab.h> #include <linux/module.h> +#include <linux/pm_runtime.h> #include <sound/core.h> #include <sound/jack.h> #include <sound/asoundef.h> @@ -764,8 +765,10 @@ static void check_presence_and_report(struct hda_codec *codec, hda_nid_t nid,

if (pin_idx < 0) return; + mutex_lock(&spec->pcm_lock); if (hdmi_present_sense(get_pin(spec, pin_idx), 1)) snd_hda_jack_report_sync(codec); + mutex_unlock(&spec->pcm_lock); }

static void jack_callback(struct hda_codec *codec, @@ -1628,21 +1631,23 @@ static void sync_eld_via_acomp(struct hda_codec *codec, static bool hdmi_present_sense(struct hdmi_spec_per_pin *per_pin, int repoll) { struct hda_codec *codec = per_pin->codec; - struct hdmi_spec *spec = codec->spec; int ret;

/* no temporary power up/down needed for component notifier */ - if (!codec_has_acomp(codec)) - snd_hda_power_up_pm(codec); + if (!codec_has_acomp(codec)) { + ret = snd_hda_power_up_pm(codec); + if (ret < 0 && pm_runtime_suspended(hda_codec_dev(codec))) { + snd_hda_power_down_pm(codec); + return false; + } + }

- mutex_lock(&spec->pcm_lock); if (codec_has_acomp(codec)) { sync_eld_via_acomp(codec, per_pin); ret = false; /* don't call snd_hda_jack_report_sync() */ } else { ret = hdmi_present_sense_via_verbs(per_pin, repoll); } - mutex_unlock(&spec->pcm_lock);

if (!codec_has_acomp(codec)) snd_hda_power_down_pm(codec); @@ -1654,12 +1659,16 @@ static void hdmi_repoll_eld(struct work_struct *work) { struct hdmi_spec_per_pin *per_pin = container_of(to_delayed_work(work), struct hdmi_spec_per_pin, work); + struct hda_codec *codec = per_pin->codec; + struct hdmi_spec *spec = codec->spec;

if (per_pin->repoll_count++ > 6) per_pin->repoll_count = 0;

+ mutex_lock(&spec->pcm_lock); if (hdmi_present_sense(per_pin, per_pin->repoll_count)) snd_hda_jack_report_sync(per_pin->codec); + mutex_unlock(&spec->pcm_lock); }

static void intel_haswell_fixup_connect_list(struct hda_codec *codec,