From: Pavel Begunkov <asml.silence@gmail.com>
Date: Thu, 30 Jul 2020 15:43:48 +0000 (+0300)
Subject: io_uring: fix stalled deferred requests
X-Git-Url: http://git.maquefel.me/?a=commitdiff_plain;h=dd9dfcdf5a603680458f5e7b0d2273c66e5417db;p=linux.git

io_uring: fix stalled deferred requests

Always do io_commit_cqring() after completing a request, even if it was
accounted as overflowed on the CQ side. Failing to do that may lead to
not to pushing deferred requests when needed, and so stalling the whole
ring.

Signed-off-by: Pavel Begunkov <asml.silence@gmail.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
---

diff --git a/fs/io_uring.c b/fs/io_uring.c
index 6e2322525da64..11c1abe8bd1a6 100644
--- a/fs/io_uring.c
+++ b/fs/io_uring.c
@@ -7849,6 +7849,7 @@ static void io_uring_cancel_files(struct io_ring_ctx *ctx,
 			}
 			WRITE_ONCE(ctx->rings->cq_overflow,
 				atomic_inc_return(&ctx->cached_cq_overflow));
+			io_commit_cqring(ctx);
 			spin_unlock_irq(&ctx->completion_lock);
 
 			/*