From e0deb6a025ae8c850dc8685be39fb27b06c88736 Mon Sep 17 00:00:00 2001 From: Pavel Begunkov Date: Fri, 13 May 2022 11:24:56 +0100 Subject: io_uring: avoid io-wq -EAGAIN looping for !IOPOLL If an opcode handler semi-reliably returns -EAGAIN, io_wq_submit_work() might continue busily hammer the same handler over and over again, which is not ideal. The -EAGAIN handling in question was put there only for IOPOLL, so restrict it to IOPOLL mode only where there is no other recourse than to retry as we cannot wait. Fixes: def596e9557c9 ("io_uring: support for IO polling") Signed-off-by: Pavel Begunkov Link: https://lore.kernel.org/r/f168b4f24181942f3614dd8ff648221736f572e6.1652433740.git.asml.silence@gmail.com Signed-off-by: Jens Axboe --- fs/io_uring.c | 2 ++ 1 file changed, 2 insertions(+) diff --git a/fs/io_uring.c b/fs/io_uring.c index 362189819898..f5f38329c823 100644 --- a/fs/io_uring.c +++ b/fs/io_uring.c @@ -7573,6 +7573,8 @@ fail: * wait for request slots on the block side. */ if (!needs_poll) { + if (!(req->ctx->flags & IORING_SETUP_IOPOLL)) + break; cond_resched(); continue; } -- cgit v1.2.3