diff options
| author | Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com> | 2021-06-14 13:08:12 -0500 |
|---|---|---|
| committer | Mark Brown <broonie@kernel.org> | 2021-06-21 13:00:43 +0100 |
| commit | 60888ef827e354d7a3611288d86629e5f1824613 (patch) | |
| tree | 5acdf04dec32359615160ef98f5bc832dd84f30d /sound/soc/codecs/rt700.c | |
| parent | d38ebaf2c88442a830d402fa7805ddbb60c4cd0c (diff) | |
ASoC: rt700-sdw: fix race condition on system suspend
In previous commits we cancelled deferred work, but there is still a
window of time where a new interrupt could result in new deferred work
executed after the link is disabled, leading to an IO error.
This patch uses an 'disable_irq_lock' mutex to prevent new interrupts
from happening after the start of the system suspend. The choice of a
mutex v. a spinlock is mainly due to the time required to clear
interrupts, which requires a command to be transmitted by the
SoundWire host IP and acknowledged with an interrupt. The
'interrupt_callback' routine is also not meant to be called from an
interrupt context.
An additional 'disable_irq' flag prevents race conditions where the
status changes before the interrupts are disabled, but the workqueue
handling status changes is scheduled after the completion of the
system suspend. On resume the interrupts are re-enabled already by the
io_init routine so we only clear the flag.
BugLink: https://github.com/thesofproject/linux/issues/2943
Fixes: 5f2df2a4583b ('ASoC: rt700: wait for the delayed work to finish when the system suspends')
Signed-off-by: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>
Reviewed-by: Bard Liao <bard.liao@intel.com>
Reviewed-by: Péter Ujfalusi <peter.ujfalusi@linux.intel.com>
Link: https://lore.kernel.org/r/20210614180815.153711-3-pierre-louis.bossart@linux.intel.com
Signed-off-by: Mark Brown <broonie@kernel.org>
Diffstat (limited to 'sound/soc/codecs/rt700.c')
| -rw-r--r-- | sound/soc/codecs/rt700.c | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/sound/soc/codecs/rt700.c b/sound/soc/codecs/rt700.c index 01af9d9dd3ca..921382724f9c 100644 --- a/sound/soc/codecs/rt700.c +++ b/sound/soc/codecs/rt700.c @@ -1112,6 +1112,8 @@ int rt700_init(struct device *dev, struct regmap *sdw_regmap, rt700->sdw_regmap = sdw_regmap; rt700->regmap = regmap; + mutex_init(&rt700->disable_irq_lock); + /* * Mark hw_init to false * HW init will be performed when device reports present @@ -1133,6 +1135,8 @@ int rt700_io_init(struct device *dev, struct sdw_slave *slave) { struct rt700_priv *rt700 = dev_get_drvdata(dev); + rt700->disable_irq = false; + if (rt700->hw_init) return 0; |