linux-kernel - Re: [RFC]Documentation:accounting:getdelays.c Fix: warning: variable ‘i’ set but not used

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Date:	Tue, 12 Apr 2011 17:26:27 -0700
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	"Justin P. Mattock" <justinmattock@...il.com>
Cc:	rdunlap@...otime.net, linux-doc@...r.kernel.org,
	linux-kernel@...r.kernel.org, Balbir Singh <balbir@...ibm.com>
Subject: Re: [RFC]Documentation:accounting:getdelays.c Fix: warning:
 variable ‘i’ set but not used

On Tue,  5 Apr 2011 09:02:50 -0700
"Justin P. Mattock" <justinmattock@...il.com> wrote:

> Keep in mind there is another warning with this file, but need am unsure what might be the best solution:
> Documentation/accounting/getdelays.c: In function ___get_family_id___:
> Documentation/accounting/getdelays.c:172:14: warning: variable ___rc___ set but not used [-Wunused-but-set-variable]

this?


Subject: Documentation/accounting/getdelays.c: handle sendto() failures
From: Andrew Morton <akpm@...ux-foundation.org>

Documentation/accounting/getdelays.c: In function `get_family_id':
Documentation/accounting/getdelays.c:172:14: warning: variable `rc' set but not used [-Wunused-but-set-variable]

Reported-by: "Justin P. Mattock" <justinmattock@...il.com>
Cc: Balbir Singh <balbir@...ibm.com>
Signed-off-by: Andrew Morton <akpm@...ux-foundation.org>
---

 Documentation/accounting/getdelays.c |    2 ++
 1 file changed, 2 insertions(+)

diff -puN Documentation/accounting/getdelays.c~documentation-accounting-getdelaysc-handle-sendto-failures Documentation/accounting/getdelays.c
--- a/Documentation/accounting/getdelays.c~documentation-accounting-getdelaysc-handle-sendto-failures
+++ a/Documentation/accounting/getdelays.c
@@ -177,6 +177,8 @@ static int get_family_id(int sd)
 	rc = send_cmd(sd, GENL_ID_CTRL, getpid(), CTRL_CMD_GETFAMILY,
 			CTRL_ATTR_FAMILY_NAME, (void *)name,
 			strlen(TASKSTATS_GENL_NAME)+1);
+	if (rc < 0)
+		return 0;	/* sendto() failure? */
 
 	rep_len = recv(sd, &ans, sizeof(ans), 0);
 	if (ans.n.nlmsg_type == NLMSG_ERROR ||
_

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