• Jens Axboe's avatar
    io_uring: acquire 'mm' for task_work for SQPOLL · 9d8426a0
    Jens Axboe authored
    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: default avatarJens Axboe <axboe@kernel.dk>
    9d8426a0
io_uring.c 193 KB