diff options
| author | Takashi Iwai <tiwai@suse.de> | 2026-10-07 19:20:44 +0200 |
|---|---|---|
| committer | Takashi Iwai <tiwai@suse.de> | 2026-10-08 08:47:07 +0200 |
| commit | a6913835735469751f56473f5212eb291a4805e7 (patch) | |
| tree | 1ba1608532b1f530420f43fd514bb8554dc94d05 /tools/lib/python | |
| parent | f224bd39d2bf95ebe5f81e710293cabac3d22636 (diff) | |
ALSA: core: Add missing barriers for power_ref vs card->shutdown
snd_power_ref_and_wait() increments card->power_ref and then reads
card->shutdown (and the power state) locklessly, while
snd_card_disconnect() sets card->shutdown and then waits for
power_ref to drop to zero via snd_power_sync_ref(). Due to the
missing barrier on both sides, the caller proceeds with shutdown still
seen as false, while the disconnect side sees a zero refcount and
continues tearing down incorrectly.
For addressing the potential race, add smp_mb__after_atomic() after
the refcount increment and smp_mb() before snd_power_sync_ref() in
snd_card_disconnect().
Fixes: e94fdbd7b25d ("ALSA: control: Track in-flight control read/write/tlv accesses")
Reported-by: Sashiko <sashiko-bot@kernel.org>
Assisted-by: LLM
Signed-off-by: Takashi Iwai <tiwai@suse.de>
Link: https://patch.msgid.link/20261007172051.13240-9-tiwai@suse.de
Diffstat (limited to 'tools/lib/python')
0 files changed, 0 insertions, 0 deletions