Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jikos/hid

[platform/adaptation/renesas_rcar/renesas_kernel.git] / ipc / msg.c

diff --git a/ipc/msg.c b/ipc/msg.c
index bd60d7e..b65fdf1 100644 (file)
--- a/ipc/msg.c
+++ b/ipc/msg.c
@@ -680,16 +680,18 @@ long do_msgsnd(int msqid, long mtype, void __user *mtext,
                goto out_unlock1;
        }
 
+       ipc_lock_object(&msq->q_perm);
+
        for (;;) {
                struct msg_sender s;
 
                err = -EACCES;
                if (ipcperms(ns, &msq->q_perm, S_IWUGO))
-                       goto out_unlock1;
+                       goto out_unlock0;
 
                err = security_msg_queue_msgsnd(msq, msg, msgflg);
                if (err)
-                       goto out_unlock1;
+                       goto out_unlock0;
 
                if (msgsz + msq->q_cbytes <= msq->q_qbytes &&
                                1 + msq->q_qnum <= msq->q_qbytes) {
@@ -699,10 +701,9 @@ long do_msgsnd(int msqid, long mtype, void __user *mtext,
                /* queue full, wait: */
                if (msgflg & IPC_NOWAIT) {
                        err = -EAGAIN;
-                       goto out_unlock1;
+                       goto out_unlock0;
                }
 
-               ipc_lock_object(&msq->q_perm);
                ss_add(msq, &s);
 
                if (!ipc_rcu_getref(msq)) {
@@ -730,10 +731,7 @@ long do_msgsnd(int msqid, long mtype, void __user *mtext,
                        goto out_unlock0;
                }
 
-               ipc_unlock_object(&msq->q_perm);
        }
-
-       ipc_lock_object(&msq->q_perm);
        msq->q_lspid = task_tgid_vnr(current);
        msq->q_stime = get_seconds();
 
@@ -839,7 +837,7 @@ static inline void free_copy(struct msg_msg *copy)
 
 static struct msg_msg *find_msg(struct msg_queue *msq, long *msgtyp, int mode)
 {
-       struct msg_msg *msg;
+       struct msg_msg *msg, *found = NULL;
        long count = 0;
 
        list_for_each_entry(msg, &msq->q_messages, m_list) {
@@ -848,6 +846,7 @@ static struct msg_msg *find_msg(struct msg_queue *msq, long *msgtyp, int mode)
                                               *msgtyp, mode)) {
                        if (mode == SEARCH_LESSEQUAL && msg->m_type != 1) {
                                *msgtyp = msg->m_type - 1;
+                               found = msg;
                        } else if (mode == SEARCH_NUMBER) {
                                if (*msgtyp == count)
                                        return msg;
@@ -857,7 +856,7 @@ static struct msg_msg *find_msg(struct msg_queue *msq, long *msgtyp, int mode)
                }
        }
 
-       return ERR_PTR(-EAGAIN);
+       return found ?: ERR_PTR(-EAGAIN);
 }
 
 long do_msgrcv(int msqid, void __user *buf, size_t bufsz, long msgtyp, int msgflg,