netdev - [PATCH v2 04/11] net/smc: smc_splice_read: always request MSG

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Date: Thu, 21 Dec 2023 04:09:00 +0100
From: 
	Ahelenia Ziemiańska <nabijaczleweli@...ijaczleweli.xyz>
Cc: Jens Axboe <axboe@...nel.dk>, Christian Brauner <brauner@...nel.org>, 
	Alexander Viro <viro@...iv.linux.org.uk>, linux-fsdevel@...r.kernel.org, 
	Wenjia Zhang <wenjia@...ux.ibm.com>, Jan Karcher <jaka@...ux.ibm.com>, 
	"D. Wythe" <alibuda@...ux.alibaba.com>, Tony Lu <tonylu@...ux.alibaba.com>, 
	Wen Gu <guwen@...ux.alibaba.com>, "David S. Miller" <davem@...emloft.net>, 
	Eric Dumazet <edumazet@...gle.com>, Jakub Kicinski <kuba@...nel.org>, 
	Paolo Abeni <pabeni@...hat.com>, linux-s390@...r.kernel.org, netdev@...r.kernel.org, 
	linux-kernel@...r.kernel.org
Subject: [PATCH v2 04/11] net/smc: smc_splice_read: always request
 MSG_DONTWAIT

Otherwise we risk sleeping with the pipe locked for indeterminate
lengths of time ‒ this meant that splice(smc -> pipe) with no data
would hold the pipe lock, and any open/read/write/close on the pipe
would enter uninterruptible sleep.

Signed-off-by: Ahelenia Ziemiańska <nabijaczleweli@...ijaczleweli.xyz>
---
 net/smc/af_smc.c | 6 +-----
 1 file changed, 1 insertion(+), 5 deletions(-)

diff --git a/net/smc/af_smc.c b/net/smc/af_smc.c
index 73eebddbbf41..a11a966d031a 100644
--- a/net/smc/af_smc.c
+++ b/net/smc/af_smc.c
@@ -3248,12 +3248,8 @@ static ssize_t smc_splice_read(struct socket *sock, loff_t *ppos,
 			rc = -ESPIPE;
 			goto out;
 		}
-		if (flags & SPLICE_F_NONBLOCK)
-			flags = MSG_DONTWAIT;
-		else
-			flags = 0;
 		SMC_STAT_INC(smc, splice_cnt);
-		rc = smc_rx_recvmsg(smc, NULL, pipe, len, flags);
+		rc = smc_rx_recvmsg(smc, NULL, pipe, len, MSG_DONTWAIT);
 	}
 out:
 	release_sock(sk);
-- 
2.39.2

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