Hi,
this series is another attempt to address the potential deadlocks via kill_fasync() calls that have been reported by syzbot for long time. Instead of the previous series to drop the async handler[*], this tries to defer the kill_fasync() call. A few new common helpers are introduced at first, then the actual usages are replaced in the following patches.
The patches passed the quick tests with alsa-lib test cases.
Takashi
[*] https://lore.kernel.org/r/20220717070549.5993-1-tiwai@suse.de
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Takashi Iwai (4): ALSA: core: Add async signal helpers ALSA: timer: Use deferred fasync helper ALSA: pcm: Use deferred fasync helper ALSA: control: Use deferred fasync helper
include/sound/control.h | 2 +- include/sound/core.h | 8 ++++ include/sound/pcm.h | 2 +- sound/core/control.c | 7 ++-- sound/core/misc.c | 93 +++++++++++++++++++++++++++++++++++++++++ sound/core/pcm.c | 1 + sound/core/pcm_lib.c | 2 +- sound/core/pcm_native.c | 2 +- sound/core/timer.c | 11 ++--- 9 files changed, 116 insertions(+), 12 deletions(-)