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soundwire: fix enumeration completion 

commit c40d6b3249 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: fb9469e54f ("soundwire: bus: fix race condition with enumeration_complete signaling")
Fixes: a90def0681 ("soundwire: bus: fix race condition with initialization_complete signaling")
Cc: stable@vger.kernel.org      # 5.7
Cc: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>
Cc: Rander Wang <rander.wang@linux.intel.com>
Signed-off-by: Johan Hovold <johan+linaro@kernel.org>
Reviewed-by: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>
Link: https://lore.kernel.org/r/20230705123018.30903-2-johan+linaro@kernel.org
Signed-off-by: Vinod Koul <vkoul@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Johan Hovold 2023-07-05 14:30:11 +02:00 committed by Greg Kroah-Hartman
parent c9491c0b24
commit c5265691cd
1 changed files with 4 additions and 4 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

8
drivers/soundwire/bus.c
View File

@ -908,8 +908,8 @@ 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)) {
@ -917,7 +917,7 @@ 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);
@ -1941,7 +1941,7 @@ 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