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| author | Takashi Iwai <[email protected]> | 2022-07-28 12:59:42 +0000 |
|---|---|---|
| committer | Takashi Iwai <[email protected]> | 2022-07-29 10:57:10 +0000 |
| commit | ef34a0ae7a2654bc9e58675e36898217fb2799d8 (patch) | |
| tree | 3444d3d9264ced511f8378bf656b276fe800cc97 /sound/core/timer.c | |
| parent | ACPI: scan: Add CLSA0101 Laptop Support (diff) | |
| download | kernel-ef34a0ae7a2654bc9e58675e36898217fb2799d8.tar.gz kernel-ef34a0ae7a2654bc9e58675e36898217fb2799d8.zip | |
ALSA: core: Add async signal helpers
Currently the call of kill_fasync() from an interrupt handler might
lead to potential spin deadlocks, as spotted by syzkaller.
Unfortunately, it's not so trivial to fix this lock chain as it's
involved with the tasklist_lock that is touched in allover places.
As a temporary workaround, this patch provides the way to defer the
async signal notification in a work. The new helper functions,
snd_fasync_helper() and snd_kill_faync() are replacements for
fasync_helper() and kill_fasync(), respectively. In addition,
snd_fasync_free() needs to be called at the destructor of the relevant
file object.
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Takashi Iwai <[email protected]>
Diffstat (limited to 'sound/core/timer.c')
0 files changed, 0 insertions, 0 deletions