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| author |   Dmitry Torokhov <dmitry.torokhov@gmail.com> | 2020-08-07 16:41:01 -0700 |
|---|---|---|
| committer | Dmitry Torokhov <dmitry.torokhov@gmail.com> | 2020-08-07 16:41:01 -0700 |
| commit | 9e8238020c5beba64e7ffafbb7ea0fb02fe68270 (patch) | |
| tree | 37c7fd953cfa7ebd3d6c476bc4c7d4de2302cdc3 /kernel/task_work.c | |
| parent | Input: elan_i2c - add more hardware ID for Lenovo laptops (diff) | |
| parent | Input: exc3000 - add support to query model and fw_version (diff) | |
| download | wireguard-linux-9e8238020c5beba64e7ffafbb7ea0fb02fe68270.tar.xz wireguard-linux-9e8238020c5beba64e7ffafbb7ea0fb02fe68270.zip | |
Merge branch 'next' into for-linus
Prepare input updates for 5.9 merge window.
Diffstat (limited to 'kernel/task_work.c')
| -rw-r--r-- | kernel/task_work.c | 18 |
1 files changed, 14 insertions, 4 deletions
diff --git a/kernel/task_work.c b/kernel/task_work.c index 0fef395662a6..825f28259a19 100644 --- a/kernel/task_work.c +++ b/kernel/task_work.c @@ -97,16 +97,26 @@ void task_work_run(void) * work->func() can do task_work_add(), do not set * work_exited unless the list is empty. */ - raw_spin_lock_irq(&task->pi_lock); do { + head = NULL; work = READ_ONCE(task->task_works); - head = !work && (task->flags & PF_EXITING) ? - &work_exited : NULL; + if (!work) { + if (task->flags & PF_EXITING) + head = &work_exited; + else + break; + } } while (cmpxchg(&task->task_works, work, head) != work); - raw_spin_unlock_irq(&task->pi_lock); if (!work) break; + /* + * Synchronize with task_work_cancel(). It can not remove + * the first entry == work, cmpxchg(task_works) must fail. + * But it can remove another entry from the ->next list. + */ + raw_spin_lock_irq(&task->pi_lock); + raw_spin_unlock_irq(&task->pi_lock); do { next = work->next; |