io_uring: don't attempt re-add of multishot poll request if racing

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We currently allow racy updates to multishot requests, but we can end up
double adding the poll request if both completion and update does it.
Ensure that we skip re-add on the update side if someone else is
completing it.

Fixes: b69de288e9 ("io_uring: allow events and user_data update of running poll requests")
Reported-by: Joakim Hassila <joj@mac.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>

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Jens Axboe 2021-04-06 09:49:31 -06:00

parent 417b5052be

commit cb3b200e4f

1 changed files with 20 additions and 10 deletions

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fs/io_uring.c

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