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Commit 3e6a0d3c authored by Jens Axboe's avatar Jens Axboe
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io_uring: fix -EAGAIN retry with IOPOLL



We no longer revert the iovec on -EIOCBQUEUED, see commit ab2125df,
and this started causing issues for IOPOLL on devies that run out of
request slots. Turns out what outside of needing a revert for those, we
also had a bug where we didn't properly setup retry inside the submission
path. That could cause re-import of the iovec, if any, and that could lead
to spurious results if the application had those allocated on the stack.

Catch -EAGAIN retry and make the iovec stable for IOPOLL, just like we do
for !IOPOLL retries.

Cc: <stable@vger.kernel.org> # 5.9+
Reported-by: default avatarAbaci Robot <abaci@linux.alibaba.com>
Reported-by: default avatarXiaoguang Wang <xiaoguang.wang@linux.alibaba.com>
Signed-off-by: default avatarJens Axboe <axboe@kernel.dk>
parent dc7bbc9e
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