linux-kernel - [PATCH 3/6] mqueue: simplify do

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Date:	Tue, 23 Feb 2010 04:04:25 -0300
From:	André Goddard Rosa <andre.goddard@...il.com>
To:	André Goddard Rosa <andre.goddard@...il.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	"Serge E . Hallyn" <serue@...ibm.com>,
	Cedric Le Goater <clg@...ibm.com>,
	Al Viro <viro@...iv.linux.org.uk>, linux-kernel@...r.kernel.org
Cc:	André Goddard Rosa <andre.goddard@...il.com>
Subject: [PATCH 3/6] mqueue: simplify do_open() error handling

It reduces code size:
text    data     bss     dec     hex filename
9925      72      16   10013    271d ipc/mqueue-BEFORE.o
9885      72      16    9973    26f5 ipc/mqueue-AFTER.o

Signed-off-by: André Goddard Rosa <andre.goddard@...il.com>
---
 ipc/mqueue.c |   16 ++++++++++------
 1 files changed, 10 insertions(+), 6 deletions(-)

diff --git a/ipc/mqueue.c b/ipc/mqueue.c
index 04403fd..2cddf93 100644
--- a/ipc/mqueue.c
+++ b/ipc/mqueue.c
@@ -657,24 +657,28 @@ out:
 static struct file *do_open(struct ipc_namespace *ipc_ns,
 				struct dentry *dentry, int oflag)
 {
+	int ret;
 	const struct cred *cred = current_cred();
 
 	static const int oflag2acc[O_ACCMODE] = { MAY_READ, MAY_WRITE,
 						  MAY_READ | MAY_WRITE };
 
 	if ((oflag & O_ACCMODE) == (O_RDWR | O_WRONLY)) {
-		dput(dentry);
-		mntput(ipc_ns->mq_mnt);
-		return ERR_PTR(-EINVAL);
+		ret = -EINVAL;
+		goto err;
 	}
 
 	if (inode_permission(dentry->d_inode, oflag2acc[oflag & O_ACCMODE])) {
-		dput(dentry);
-		mntput(ipc_ns->mq_mnt);
-		return ERR_PTR(-EACCES);
+		ret = -EACCES;
+		goto err;
 	}
 
 	return dentry_open(dentry, ipc_ns->mq_mnt, oflag, cred);
+
+err:
+	dput(dentry);
+	mntput(ipc_ns->mq_mnt);
+	return ERR_PTR(ret);
 }
 
 SYSCALL_DEFINE4(mq_open, const char __user *, u_name, int, oflag, mode_t, mode,
-- 
1.7.0.87.g0901d

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