Merge tag 'io_uring-5.15-2021-10-01' of git://git.kernel.dk/linux-block

Pull io_uring fixes from Jens Axboe:
"Two fixes in here:

- The signal issue that was discussed start of this week (me).

- Kill dead fasync support in io_uring. Looks like it was broken
since io_uring was initially merged, and given that nobody has ever
complained about it, let's just kill it (Pavel)"

* tag 'io_uring-5.15-2021-10-01' of git://git.kernel.dk/linux-block:
io_uring: kill fasync
io-wq: exclusively gate signal based exit on get_signal() return

fs/io-wq.c

···
 
 			if (!get_signal(&ksig))
 				continue;
-			if (fatal_signal_pending(current) ||
-			    signal_group_exit(current->signal))
-				break;
-			continue;
+			break;
 		}
 		last_timeout = !ret;
 	}

fs/io_uring.c

···
 		struct wait_queue_head	cq_wait;
 		unsigned		cq_extra;
 		atomic_t		cq_timeouts;
-		struct fasync_struct	*cq_fasync;
 		unsigned		cq_last_tm_flush;
 	} ____cacheline_aligned_in_smp;
 
···
 		wake_up(&ctx->sq_data->wait);
 	if (io_should_trigger_evfd(ctx))
 		eventfd_signal(ctx->cq_ev_fd, 1);
-	if (waitqueue_active(&ctx->poll_wait)) {
+	if (waitqueue_active(&ctx->poll_wait))
 		wake_up_interruptible(&ctx->poll_wait);
-		kill_fasync(&ctx->cq_fasync, SIGIO, POLL_IN);
-	}
 }
 
 static void io_cqring_ev_posted_iopoll(struct io_ring_ctx *ctx)
···
 	}
 	if (io_should_trigger_evfd(ctx))
 		eventfd_signal(ctx->cq_ev_fd, 1);
-	if (waitqueue_active(&ctx->poll_wait)) {
+	if (waitqueue_active(&ctx->poll_wait))
 		wake_up_interruptible(&ctx->poll_wait);
-		kill_fasync(&ctx->cq_fasync, SIGIO, POLL_IN);
-	}
 }
 
 /* Returns true if there are no backlogged entries after the flush */
···
 	return mask;
 }
 
-static int io_uring_fasync(int fd, struct file *file, int on)
-{
-	struct io_ring_ctx *ctx = file->private_data;
-
-	return fasync_helper(fd, file, on, &ctx->cq_fasync);
-}
-
 static int io_unregister_personality(struct io_ring_ctx *ctx, unsigned id)
 {
 	const struct cred *creds;
···
 	.mmap_capabilities = io_uring_nommu_mmap_capabilities,
 #endif
 	.poll		= io_uring_poll,
-	.fasync		= io_uring_fasync,
 #ifdef CONFIG_PROC_FS
 	.show_fdinfo	= io_uring_show_fdinfo,
 #endif