io_uring: prevent sq_thread from spinning when it should stop

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commit 7143b5ac57 upstream.

This patch drops 'cur_mm' before calling cond_resched(), to prevent
the sq_thread from spinning even when the user process is finished.

Before this patch, if the user process ended without closing the
io_uring fd, the sq_thread continues to spin until the
'sq_thread_idle' timeout ends.

In the worst case where the 'sq_thread_idle' parameter is bigger than
INT_MAX, the sq_thread will spin forever.

Fixes: 6c271ce2f1 ("io_uring: add submission polling")
Signed-off-by: Stefano Garzarella <sgarzare@redhat.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

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Stefano Garzarella 2020-02-21 16:42:16 +01:00 • committed by Greg Kroah-Hartman

parent 8083cc0459

commit 2ac6220a33

1 changed files with 12 additions and 12 deletions

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fs/io_uring.c

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