From e1d54962a63b6ec04ed0204a3ecca942fde3a6fe Mon Sep 17 00:00:00 2001 From: Johan Hovold Date: Wed, 5 Jul 2023 14:30:11 +0200 Subject: [PATCH] soundwire: fix enumeration completion commit c40d6b3249b11d60e09d81530588f56233d9aa44 upstream. The soundwire subsystem uses two completion structures that allow drivers to wait for soundwire device to become enumerated on the bus and initialised by their drivers, respectively. The code implementing the signalling is currently broken as it does not signal all current and future waiters and also uses the wrong reinitialisation function, which can potentially lead to memory corruption if there are still waiters on the queue. Not signalling future waiters specifically breaks sound card probe deferrals as codec drivers can not tell that the soundwire device is already attached when being reprobed. Some codec runtime PM implementations suffer from similar problems as waiting for enumeration during resume can also timeout despite the device already having been enumerated. Fixes: fb9469e54fa7 ("soundwire: bus: fix race condition with enumeration_complete signaling") Fixes: a90def068127 ("soundwire: bus: fix race condition with initialization_complete signaling") Cc: stable@vger.kernel.org # 5.7 Cc: Pierre-Louis Bossart Cc: Rander Wang Signed-off-by: Johan Hovold Reviewed-by: Pierre-Louis Bossart Link: https://lore.kernel.org/r/20230705123018.30903-2-johan+linaro@kernel.org Signed-off-by: Vinod Koul Signed-off-by: Greg Kroah-Hartman --- drivers/soundwire/bus.c | 8 ++++---- 1 file changed, 4 insertions(+), 4 deletions(-) diff --git a/drivers/soundwire/bus.c b/drivers/soundwire/bus.c index 4fd221d0cc81..f7b3e6a6975b 100644 --- a/drivers/soundwire/bus.c +++ b/drivers/soundwire/bus.c @@ -884,8 +884,8 @@ static void sdw_modify_slave_status(struct sdw_slave *slave, "initializing enumeration and init completion for Slave %d\n", slave->dev_num); - init_completion(&slave->enumeration_complete); - init_completion(&slave->initialization_complete); + reinit_completion(&slave->enumeration_complete); + reinit_completion(&slave->initialization_complete); } else if ((status == SDW_SLAVE_ATTACHED) && (slave->status == SDW_SLAVE_UNATTACHED)) { @@ -893,7 +893,7 @@ static void sdw_modify_slave_status(struct sdw_slave *slave, "signaling enumeration completion for Slave %d\n", slave->dev_num); - complete(&slave->enumeration_complete); + complete_all(&slave->enumeration_complete); } slave->status = status; mutex_unlock(&bus->bus_lock); @@ -1916,7 +1916,7 @@ int sdw_handle_slave_status(struct sdw_bus *bus, "signaling initialization completion for Slave %d\n", slave->dev_num); - complete(&slave->initialization_complete); + complete_all(&slave->initialization_complete); /* * If the manager became pm_runtime active, the peripherals will be -- 2.34.1