netdev - [PATCH RFC v1] 9p/trans_fd: Use common error handling code in p9_fd_create

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Date:   Tue, 7 Nov 2017 17:21:25 +0100
From:   SF Markus Elfring <elfring@...rs.sourceforge.net>
To:     v9fs-developer@...ts.sourceforge.net, netdev@...r.kernel.org,
        "David S. Miller" <davem@...emloft.net>,
        Eric Van Hensbergen <ericvh@...il.com>,
        Latchesar Ionkov <lucho@...kov.net>,
        Ron Minnich <rminnich@...dia.gov>
Cc:     LKML <linux-kernel@...r.kernel.org>,
        kernel-janitors@...r.kernel.org
Subject: [PATCH RFC v1] 9p/trans_fd: Use common error handling code in
 p9_fd_create_tcp()

From: Markus Elfring <elfring@...rs.sourceforge.net>
Date: Tue, 7 Nov 2017 10:05:20 +0100

Add a jump target so that a bit of exception handling can be better reused
at the end of this function.

This issue was detected by using the Coccinelle software.

Signed-off-by: Markus Elfring <elfring@...rs.sourceforge.net>
---

v1 - Request for comments:
I can offer another bit of information for a software development discussion. 💭

The affected source file can be compiled for the processor architecture “x86_64”
by a tool like “GCC 6.4.1+r251631-1.3” from the software distribution
“openSUSE Tumbleweed” with the following command example.

my_cc=/usr/bin/gcc-6 \
&& my_module=net/9p/trans_fd.o \
&& for XYZ in 0 s 3; do echo "   _____ $XYZ _____" \
&& my_extra="-O$XYZ" \
&& git checkout next-20171102 \
&& make -j4 CC="${my_cc}" HOSTCC="${my_cc}" EXTRA_CFLAGS="${my_extra}" allmodconfig "${my_module}" \
&& size "${my_module}" \
&& git checkout ':/^9p/trans_fd: Use common error handling code in p9_fd_create_tcp' \
&& make -j4 CC="${my_cc}" HOSTCC="${my_cc}" EXTRA_CFLAGS="${my_extra}" allmodconfig "${my_module}" \
&& size "${my_module}"; done


🔮 Do you find the following differences worth for further clarification?

╔═════════╤══════╗
║ setting │ text ║
╠═════════╪══════╣
║   O0    │ -14  ║
║   Os    │ +13  ║
║   O3    │  0   ║
╚═════════╧══════╝


 net/9p/trans_fd.c | 10 ++++++----
 1 file changed, 6 insertions(+), 4 deletions(-)

diff --git a/net/9p/trans_fd.c b/net/9p/trans_fd.c
index 903a190319b9..161c2249ca2a 100644
--- a/net/9p/trans_fd.c
+++ b/net/9p/trans_fd.c
@@ -974,8 +974,7 @@ p9_fd_create_tcp(struct p9_client *client, const char *addr, char *args)
 		if (err < 0) {
 			pr_err("%s (%d): problem binding to privport\n",
 			       __func__, task_pid_nr(current));
-			sock_release(csocket);
-			return err;
+			goto release_socket;
 		}
 	}
 
@@ -985,11 +984,14 @@ p9_fd_create_tcp(struct p9_client *client, const char *addr, char *args)
 	if (err < 0) {
 		pr_err("%s (%d): problem connecting socket to %s\n",
 		       __func__, task_pid_nr(current), addr);
-		sock_release(csocket);
-		return err;
+		goto release_socket;
 	}
 
 	return p9_socket_open(client, csocket);
+
+release_socket:
+	sock_release(csocket);
+	return err;
 }
 
 static int
-- 
2.15.0