io_uring: acquire 'mm' for task_work for SQPOLL

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If we're unlucky with timing, we could be running task_work after
having dropped the memory context in the sq thread. Since dropping
the context requires a runnable task state, we cannot reliably drop
it as part of our check-for-work loop in io_sq_thread(). Instead,
abstract out the mm acquire for the sq thread into a helper, and call
it from the async task work handler.

Cc: stable@vger.kernel.org # v5.7
Signed-off-by: Jens Axboe <axboe@kernel.dk>

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Jens Axboe 2020-06-16 18:42:49 -06:00

parent bbde017a32

commit 9d8426a091

1 changed files with 29 additions and 15 deletions

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fs/io_uring.c

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