mqueue: only set error codes if they are really necessary

... postponing assignments until they're needed. Doesn't change code size.

Signed-off-by: André Goddard Rosa <andre.goddard@gmail.com>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>

1 files changed, 50 insertions, 27 deletions

diff --git a/ipc/mqueue.c b/ipc/mqueue.c
index 3853116a2ef..547d9c8631f 100644
--- a/ipc/mqueue.c
+++ b/ipc/mqueue.c
@@ -184,7 +184,7 @@ static int mqueue_fill_super(struct super_block *sb, void *data, int silent)
 {
         struct inode *inode;
         struct ipc_namespace *ns = data;
-        int error = 0;
+        int error;
 
         sb->s_blocksize = PAGE_CACHE_SIZE;
         sb->s_blocksize_bits = PAGE_CACHE_SHIFT;
@@ -202,7 +202,9 @@ static int mqueue_fill_super(struct super_block *sb, void *data, int silent)
         if (!sb->s_root) {
                 iput(inode);
                 error = -ENOMEM;
+                goto out;
         }
+        error = 0;
 
 out:
         return error;
@@ -621,9 +623,10 @@ static struct file *do_create(struct ipc_namespace *ipc_ns, struct dentry *dir,
         int ret;
 
         if (attr) {
-                ret = -EINVAL;
-                if (!mq_attr_ok(ipc_ns, attr))
+                if (!mq_attr_ok(ipc_ns, attr)) {
+                        ret = -EINVAL;
                         goto out;
+                }
                 /* store for use during create */
                 dentry->d_fsdata = attr;
         }
@@ -714,9 +717,10 @@ SYSCALL_DEFINE4(mq_open, const char __user *, u_name, int, oflag, mode_t, mode,
         if (oflag & O_CREAT) {
                 if (dentry->d_inode) {  /* entry already exists */
                         audit_inode(name, dentry);
-                        error = -EEXIST;
-                        if (oflag & O_EXCL)
+                        if (oflag & O_EXCL) {
+                                error = -EEXIST;
                                 goto out;
+                        }
                         filp = do_open(ipc_ns, dentry, oflag);
                 } else {
                         filp = do_create(ipc_ns, ipc_ns->mq_mnt->mnt_root,
@@ -724,9 +728,10 @@ SYSCALL_DEFINE4(mq_open, const char __user *, u_name, int, oflag, mode_t, mode,
                                                 u_attr ? &attr : NULL);
                 }
         } else {
-                error = -ENOENT;
-                if (!dentry->d_inode)
+                if (!dentry->d_inode) {
+                        error = -ENOENT;
                         goto out;
+                }
                 audit_inode(name, dentry);
                 filp = do_open(ipc_ns, dentry, oflag);
         }
@@ -873,19 +878,24 @@ SYSCALL_DEFINE5(mq_timedsend, mqd_t, mqdes, const char __user *, u_msg_ptr,
         audit_mq_sendrecv(mqdes, msg_len, msg_prio, p);
         timeout = prepare_timeout(p);
 
-        ret = -EBADF;
         filp = fget(mqdes);
-        if (unlikely(!filp))
+        if (unlikely(!filp)) {
+                ret = -EBADF;
                 goto out;
+        }
 
         inode = filp->f_path.dentry->d_inode;
-        if (unlikely(filp->f_op != &mqueue_file_operations))
+        if (unlikely(filp->f_op != &mqueue_file_operations)) {
+                ret = -EBADF;
                 goto out_fput;
+        }
         info = MQUEUE_I(inode);
         audit_inode(NULL, filp->f_path.dentry);
 
-        if (unlikely(!(filp->f_mode & FMODE_WRITE)))
+        if (unlikely(!(filp->f_mode & FMODE_WRITE))) {
+                ret = -EBADF;
                 goto out_fput;
+        }
 
         if (unlikely(msg_len > info->attr.mq_msgsize)) {
                 ret = -EMSGSIZE;
@@ -962,19 +972,24 @@ SYSCALL_DEFINE5(mq_timedreceive, mqd_t, mqdes, char __user *, u_msg_ptr,
         audit_mq_sendrecv(mqdes, msg_len, 0, p);
         timeout = prepare_timeout(p);
 
-        ret = -EBADF;
         filp = fget(mqdes);
-        if (unlikely(!filp))
+        if (unlikely(!filp)) {
+                ret = -EBADF;
                 goto out;
+        }
 
         inode = filp->f_path.dentry->d_inode;
-        if (unlikely(filp->f_op != &mqueue_file_operations))
+        if (unlikely(filp->f_op != &mqueue_file_operations)) {
+                ret = -EBADF;
                 goto out_fput;
+        }
         info = MQUEUE_I(inode);
         audit_inode(NULL, filp->f_path.dentry);
 
-        if (unlikely(!(filp->f_mode & FMODE_READ)))
+        if (unlikely(!(filp->f_mode & FMODE_READ))) {
+                ret = -EBADF;
                 goto out_fput;
+        }
 
         /* checks if buffer is big enough */
         if (unlikely(msg_len < info->attr.mq_msgsize)) {
@@ -1064,13 +1079,14 @@ SYSCALL_DEFINE2(mq_notify, mqd_t, mqdes,
 
                         /* create the notify skb */
                         nc = alloc_skb(NOTIFY_COOKIE_LEN, GFP_KERNEL);
-                        ret = -ENOMEM;
-                        if (!nc)
+                        if (!nc) {
+                                ret = -ENOMEM;
                                 goto out;
-                        ret = -EFAULT;
+                        }
                         if (copy_from_user(nc->data,
                                         notification.sigev_value.sival_ptr,
                                         NOTIFY_COOKIE_LEN)) {
+                                ret = -EFAULT;
                                 goto out;
                         }
 
@@ -1079,9 +1095,10 @@ SYSCALL_DEFINE2(mq_notify, mqd_t, mqdes,
                         /* and attach it to the socket */
 retry:
                         filp = fget(notification.sigev_signo);
-                        ret = -EBADF;
-                        if (!filp)
+                        if (!filp) {
+                                ret = -EBADF;
                                 goto out;
+                        }
                         sock = netlink_getsockbyfilp(filp);
                         fput(filp);
                         if (IS_ERR(sock)) {
@@ -1093,7 +1110,7 @@ retry:
                         timeo = MAX_SCHEDULE_TIMEOUT;
                         ret = netlink_attachskb(sock, nc, &timeo, NULL);
                         if (ret == 1)
-                                goto retry;
+                                goto retry;
                         if (ret) {
                                 sock = NULL;
                                 nc = NULL;
@@ -1102,14 +1119,17 @@ retry:
                 }
         }
 
-        ret = -EBADF;
         filp = fget(mqdes);
-        if (!filp)
+        if (!filp) {
+                ret = -EBADF;
                 goto out;
+        }
 
         inode = filp->f_path.dentry->d_inode;
-        if (unlikely(filp->f_op != &mqueue_file_operations))
+        if (unlikely(filp->f_op != &mqueue_file_operations)) {
+                ret = -EBADF;
                 goto out_fput;
+        }
         info = MQUEUE_I(inode);
 
         ret = 0;
@@ -1172,14 +1192,17 @@ SYSCALL_DEFINE3(mq_getsetattr, mqd_t, mqdes,
                         return -EINVAL;
         }
 
-        ret = -EBADF;
         filp = fget(mqdes);
-        if (!filp)
+        if (!filp) {
+                ret = -EBADF;
                 goto out;
+        }
 
         inode = filp->f_path.dentry->d_inode;
-        if (unlikely(filp->f_op != &mqueue_file_operations))
+        if (unlikely(filp->f_op != &mqueue_file_operations)) {
+                ret = -EBADF;
                 goto out_fput;
+        }
         info = MQUEUE_I(inode);
 
         spin_lock(&info->lock);