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@gmail.com>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>

diff --git a/ipc/mqueue.c b/ipc/mqueue.c
index 15eabf9..3853116 100644 (file)
--- 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,