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io_uring: retry io_uring_submit() if it fails with errno=EINTR 

As recently documented [1], io_uring_enter(2) syscall can return an
error (errno=EINTR) if the operation was interrupted by a delivery
of a signal before it could complete.

This should happen when IORING_ENTER_GETEVENTS flag is used, for
example during io_uring_submit_and_wait() or during io_uring_submit()
when IORING_SETUP_IOPOLL is enabled.

We shouldn't have this problem for now, but it's better to prevent it.

[1] 344355ec66

Signed-off-by: Stefano Garzarella <sgarzare@redhat.com>
Message-id: 20200519133041.112138-1-sgarzare@redhat.com
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
This commit is contained in:
Stefano Garzarella 2020-05-19 15:30:41 +02:00 committed by Stefan Hajnoczi
parent 66234fee9c
commit b4e44c9944
1 changed files with 1 additions and 1 deletions
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2
block/io_uring.c
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@ -231,7 +231,7 @@ static int ioq_submit(LuringState *s)
trace_luring_io_uring_submit(s, ret);
/* Prevent infinite loop if submission is refused */
if (ret <= 0) {
if (ret == -EAGAIN) {
if (ret == -EAGAIN || ret == -EINTR) {
continue;
}
break;