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authorDavid Henningsson <david.henningsson@canonical.com>2013-12-18 10:46:04 +0100
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2014-01-29 05:06:18 -0800
commitd112bace4521ff50b40b68bf1375fb5e8feed217 (patch)
tree456987ee892ea51392f1496053f7a838a8a61d1c
parentf4d566d8de432c1bf94f8f26dd99871601775203 (diff)
ALSA: hda - Explicitly keep codec powered up in hdmi_present_sense
commit da4a7a3926d09c13ae052ede67feb7285e01e3f5 upstream. This should help us avoid the following mutex deadlock: [] mutex_lock+0x2a/0x50 [] hdmi_present_sense+0x53/0x3a0 [snd_hda_codec_hdmi] [] generic_hdmi_resume+0x5a/0x70 [snd_hda_codec_hdmi] [] hda_call_codec_resume+0xec/0x1d0 [snd_hda_codec] [] snd_hda_power_save+0x1e4/0x280 [snd_hda_codec] [] codec_exec_verb+0x5f/0x290 [snd_hda_codec] [] snd_hda_codec_read+0x5b/0x90 [snd_hda_codec] [] snd_hdmi_get_eld_size+0x1e/0x20 [snd_hda_codec_hdmi] [] snd_hdmi_get_eld+0x2c/0xd0 [snd_hda_codec_hdmi] [] hdmi_present_sense+0x9a/0x3a0 [snd_hda_codec_hdmi] [] hdmi_repoll_eld+0x34/0x50 [snd_hda_codec_hdmi] Signed-off-by: David Henningsson <david.henningsson@canonical.com> Fixes: cbbaa603a03c ('ALSA: hda - Fix possible races in HDMI driver') Signed-off-by: Takashi Iwai <tiwai@suse.de> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
-rw-r--r--sound/pci/hda/patch_hdmi.c6
1 files changed, 5 insertions, 1 deletions
diff --git a/sound/pci/hda/patch_hdmi.c b/sound/pci/hda/patch_hdmi.c
index f281c8068557..314b77eb1216 100644
--- a/sound/pci/hda/patch_hdmi.c
+++ b/sound/pci/hda/patch_hdmi.c
@@ -1496,11 +1496,14 @@ static bool hdmi_present_sense(struct hdmi_spec_per_pin *per_pin, int repoll)
* specification worked this way. Hence, we just ignore the data in
* the unsolicited response to avoid custom WARs.
*/
- int present = snd_hda_pin_sense(codec, pin_nid);
+ int present;
bool update_eld = false;
bool eld_changed = false;
bool ret;
+ snd_hda_power_up(codec);
+ present = snd_hda_pin_sense(codec, pin_nid);
+
mutex_lock(&per_pin->lock);
pin_eld->monitor_present = !!(present & AC_PINSENSE_PRESENCE);
if (pin_eld->monitor_present)
@@ -1573,6 +1576,7 @@ static bool hdmi_present_sense(struct hdmi_spec_per_pin *per_pin, int repoll)
jack->block_report = !ret;
mutex_unlock(&per_pin->lock);
+ snd_hda_power_down(codec);
return ret;
}