linux-kernel - [RFC PATCH 07/21] pipe: Remove redundant wakeup from pipe

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Message-ID: <157117613252.15019.4979488404301515759.stgit@warthog.procyon.org.uk>
Date:   Tue, 15 Oct 2019 22:48:52 +0100
From:   David Howells <dhowells@...hat.com>
To:     torvalds@...ux-foundation.org
Cc:     dhowells@...hat.com, Casey Schaufler <casey@...aufler-ca.com>,
        Stephen Smalley <sds@...ho.nsa.gov>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        nicolas.dichtel@...nd.com, raven@...maw.net,
        Christian Brauner <christian@...uner.io>, dhowells@...hat.com,
        keyrings@...r.kernel.org, linux-usb@...r.kernel.org,
        linux-block@...r.kernel.org, linux-security-module@...r.kernel.org,
        linux-fsdevel@...r.kernel.org, linux-api@...r.kernel.org,
        linux-security-module@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [RFC PATCH 07/21] pipe: Remove redundant wakeup from pipe_write()

Remove a redundant wakeup from pipe_write().

Signed-off-by: David Howells <dhowells@...hat.com>
---

 fs/pipe.c |    5 -----
 1 file changed, 5 deletions(-)

diff --git a/fs/pipe.c b/fs/pipe.c
index 5a199b249191..289a887f6b5b 100644
--- a/fs/pipe.c
+++ b/fs/pipe.c
@@ -516,11 +516,6 @@ pipe_write(struct kiocb *iocb, struct iov_iter *from)
 				ret = -ERESTARTSYS;
 			break;
 		}
-		if (do_wakeup) {
-			wake_up_interruptible_sync_poll(&pipe->wait, EPOLLIN | EPOLLRDNORM);
-			kill_fasync(&pipe->fasync_readers, SIGIO, POLL_IN);
-			do_wakeup = 0;
-		}
 		pipe->waiting_writers++;
 		pipe_wait(pipe);
 		pipe->waiting_writers--;