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soundwire: Intel: test bus.bpt_stream before assigning it

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[ Upstream commit b2c9f1d5a7 ]

We only allow up to 1 bpt stream running on a SoundWire bus.
bus.bpt_stream will be assigned when it is opened and will be set to
NULL when it is closed. We do check bus->bpt_stream_refcount if the
stream type is SDW_STREAM_BPT in sdw_master_rt_alloc(), but at that
moment the bpt stream is allocated and set to bus.bpt_stream. It will
lead to the original bus.bpt_stream be changed to the new and not used
bpt stream. And it will be released and set to NULL when
sdw_slave_bpt_stream_add() return error as it supposed to. Then the
original stream will try to use the NULL bus.bpt_stream.

Fixes: 4c1ce9f37d ("soundwire: intel_ace2x: add BPT send_async/wait callbacks")
Reported-by: Simon Trimmer <simont@opensource.cirrus.com>
Signed-off-by: Bard Liao <yung-chuan.liao@linux.intel.com>
Reviewed-by: Simon Trimmer <simont@opensource.cirrus.com>
Reviewed-by: Ranjani Sridharan <ranjani.sridharan@linux.intel.com>
Link: https://patch.msgid.link/20260126054045.2504103-1-yung-chuan.liao@linux.intel.com
Signed-off-by: Vinod Koul <vkoul@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Bard Liao
2026-05-23 13:06:49 +02:00
committed by Greg Kroah-Hartman
parent 03d56c4c38
commit 4cafee50af
1 changed files with 5 additions and 0 deletions
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drivers/soundwire/intel_ace2x.c
+5
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@@ -68,6 +68,11 @@ static int intel_ace2x_bpt_open_stream(struct sdw_intel *sdw, struct sdw_slave *
int dir;
int i;
if (cdns->bus.bpt_stream) {
dev_err(cdns->dev, "%s: BPT stream already exists\n", __func__);
return -EAGAIN;
}
stream = sdw_alloc_stream("BPT", SDW_STREAM_BPT);
if (!stream)
return -ENOMEM;