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soundwire: stream: sdw_stream_remove_slave(): Check stream is valid

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In sdw_stream_remove_slave() check that stream is a valid pointer
before passing it to functions that dereference it. Return 0 if the
pointer is invalid.

This is a convenience for callers. They can safely call this function
during cleanup code without needing a pointer validity check duplicated
at every call point.

Signed-off-by: Richard Fitzgerald <rf@opensource.cirrus.com>
Reviewed-by: Pierre-Louis Bossart <pierre-louis.bossart@linux.dev>
Link: https://patch.msgid.link/20260430143353.2702714-1-rf@opensource.cirrus.com
Signed-off-by: Vinod Koul <vkoul@kernel.org>
This commit is contained in:
Richard Fitzgerald 2026-04-30 15:33:53 +01:00 committed by Vinod Koul
parent 254f49634e
commit 9a0afdd19a
1 changed files with 5 additions and 1 deletions
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6
drivers/soundwire/stream.c
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@ -2229,11 +2229,15 @@ EXPORT_SYMBOL(sdw_stream_add_slave);
* @slave: SDW Slave instance
* @stream: SoundWire stream
*
* This removes and frees port_rt and slave_rt from a stream
* This removes and frees port_rt and slave_rt from a stream.
* If stream is NULL or an ERR_PTR, do nothing and return 0.
*/
int sdw_stream_remove_slave(struct sdw_slave *slave,
struct sdw_stream_runtime *stream)
{
if (IS_ERR_OR_NULL(stream))
return 0;
mutex_lock(&slave->bus->bus_lock);
sdw_slave_port_free(slave, stream);