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Code Issues Releases Wiki Activity

io_uring: mark task TASK_RUNNING before handling resume/task work

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Just like for task_work, set the task mode to TASK_RUNNING before doing
any potential resume work. We're not holding any locks at this point,
but we may have already set the task state to TASK_INTERRUPTIBLE in
preparation for going to sleep waiting for events. Ensure that we set it
back to TASK_RUNNING if we have work to process, to avoid warnings on
calling blocking operations with !TASK_RUNNING.

Fixes: b5d3ae202f ("io_uring: handle TIF_NOTIFY_RESUME when checking for task_work")
Reported-by: kernel test robot <oliver.sang@intel.com>
Link: https://lore.kernel.org/oe-lkp/202302062208.24d3e563-oliver.sang@intel.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Jens Axboe 2023-02-06 08:20:46 -07:00
parent 0ffae640ad
commit 2f2bb1ffc9
1 changed files with 3 additions and 1 deletions
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4
io_uring/io_uring.h
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@ -281,8 +281,10 @@ static inline int io_run_task_work(void)
* notify work that needs processing.
*/
if (current->flags & PF_IO_WORKER &&
test_thread_flag(TIF_NOTIFY_RESUME))
test_thread_flag(TIF_NOTIFY_RESUME)) {
__set_current_state(TASK_RUNNING);
resume_user_mode_work(NULL);
}
if (task_work_pending(current)) {
__set_current_state(TASK_RUNNING);
task_work_run();