mqueue: remove unneeded info->messages initialization

... and abort earlier if we couldn't allocate the message pointers array,
avoiding the u->mq_bytes accounting logic.

It reduces code size:
   text    data     bss     dec     hex filename
   9949      72      16   10037    2735 ipc/mqueue-BEFORE.o
   9941      72      16   10029    272d ipc/mqueue-AFTER.o

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

1 files changed, 5 insertions, 8 deletions

diff --git a/ipc/mqueue.c b/ipc/mqueue.c
index 04985a7256c2..3660c334ee6b 100644
--- a/ipc/mqueue.c
+++ b/ipc/mqueue.c
@@ -134,7 +134,6 @@ static struct inode *mqueue_get_inode(struct super_block *sb,
                         init_waitqueue_head(&info->wait_q);
                         INIT_LIST_HEAD(&info->e_wait_q[0].list);
                         INIT_LIST_HEAD(&info->e_wait_q[1].list);
-                        info->messages = NULL;
                         info->notify_owner = NULL;
                         info->qsize = 0;
                         info->user = NULL;      /* set when all is ok */
@@ -146,6 +145,10 @@ static struct inode *mqueue_get_inode(struct super_block *sb,
                                 info->attr.mq_msgsize = attr->mq_msgsize;
                         }
                         mq_msg_tblsz = info->attr.mq_maxmsg * sizeof(struct msg_msg *);
+                        info->messages = kmalloc(mq_msg_tblsz, GFP_KERNEL);
+                        if (!info->messages)
+                                goto out_inode;
+
                         mq_bytes = (mq_msg_tblsz +
                                 (info->attr.mq_maxmsg * info->attr.mq_msgsize));
 
@@ -154,18 +157,12 @@ static struct inode *mqueue_get_inode(struct super_block *sb,
                             u->mq_bytes + mq_bytes >
                             p->signal->rlim[RLIMIT_MSGQUEUE].rlim_cur) {
                                 spin_unlock(&mq_lock);
+                                kfree(info->messages);
                                 goto out_inode;
                         }
                         u->mq_bytes += mq_bytes;
                         spin_unlock(&mq_lock);
 
-                        info->messages = kmalloc(mq_msg_tblsz, GFP_KERNEL);
-                        if (!info->messages) {
-                                spin_lock(&mq_lock);
-                                u->mq_bytes -= mq_bytes;
-                                spin_unlock(&mq_lock);
-                                goto out_inode;
-                        }
                         /* all is ok */
                         info->user = get_uid(u);
                 } else if (S_ISDIR(mode)) {