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 <[email protected]>
Signed-off-by: Jens Axboe <[email protected]>

Author: isilence

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);
 
 			/*