ASoC: sdw_utils: clear stale RT711 device reference on exit

asoc_sdw_rt711_exit() drops the reference held in ctx->headset_codec_dev
but leaves the pointer populated. If the card cleanup path reaches the
exit hook more than once after a failed or deferred probe, a later
invocation reuses the stale pointer and calls put_device() again,
underflowing the refcount and leading to oopses when later probe,
driver bind, or suspend paths walk the SoundWire bus after the device
reference was released. Observed as boot- and suspend-time oopses on an
arm64 platform with an RT712 headset codec, reproducible
deterministically by repeated machine-driver probe cycling with the
codec drivers unloaded.

Clear the pointer after put_device() so repeated cleanup becomes a
no-op, which also makes the existing NULL check at the top of the exit
hook effective. This matches what commit 046173b98de3 ("ASoC: sdw_utils:
fix double put_device() on aggregated amps") did for the aggregated amp
references.

Fixes: 811648340707 ("ASoC: Intel: sof_sdw: avoid oops in error handling")
Cc: stable@vger.kernel.org
Signed-off-by: David Cemin <dcemin@nvidia.com>
Link: https://patch.msgid.link/20260912182131.1156475-1-dcemin@nvidia.com
Signed-off-by: Mark Brown <broonie@kernel.org>

0 files changed, 0 insertions, 0 deletions