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authorPeter Hurley <peter@hurleysoftware.com>2013-04-30 19:15:04 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2013-05-01 08:12:57 -0700
commitdaaf74cf0867e3042090d56d10b194d6265b4684 (patch)
tree374a5a8f993417a5a985ba94c3b178ee4e63a389 /ipc
parentd076ac9112797884c0be35f4c93c1517aa352c0c (diff)
downloadlinux-daaf74cf0867e3042090d56d10b194d6265b4684.tar.gz
ipc: refactor msg list search into separate function
[fengguang.wu@intel.com: find_msg can be static] Signed-off-by: Peter Hurley <peter@hurleysoftware.com> Cc: Fengguang Wu <fengguang.wu@intel.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'ipc')
-rw-r--r--ipc/msg.c48
1 files changed, 26 insertions, 22 deletions
diff --git a/ipc/msg.c b/ipc/msg.c
index a9227502313..a80aaf463d9 100644
--- a/ipc/msg.c
+++ b/ipc/msg.c
@@ -807,6 +807,30 @@ static inline void free_copy(struct msg_msg *copy)
}
#endif
+static struct msg_msg *find_msg(struct msg_queue *msq, long *msgtyp, int mode)
+{
+ struct msg_msg *msg;
+ long count = 0;
+
+ list_for_each_entry(msg, &msq->q_messages, m_list) {
+ if (testmsg(msg, *msgtyp, mode) &&
+ !security_msg_queue_msgrcv(msq, msg, current,
+ *msgtyp, mode)) {
+ if (mode == SEARCH_LESSEQUAL && msg->m_type != 1) {
+ *msgtyp = msg->m_type - 1;
+ } else if (mode == SEARCH_NUMBER) {
+ if (*msgtyp == count)
+ return msg;
+ } else
+ return msg;
+ count++;
+ }
+ }
+
+ return ERR_PTR(-EAGAIN);
+}
+
+
long do_msgrcv(int msqid, void __user *buf, size_t bufsz, long msgtyp,
int msgflg,
long (*msg_handler)(void __user *, struct msg_msg *, size_t))
@@ -836,33 +860,13 @@ long do_msgrcv(int msqid, void __user *buf, size_t bufsz, long msgtyp,
for (;;) {
struct msg_receiver msr_d;
- struct msg_msg *walk_msg;
- long msg_counter = 0;
msg = ERR_PTR(-EACCES);
if (ipcperms(ns, &msq->q_perm, S_IRUGO))
goto out_unlock;
- msg = ERR_PTR(-EAGAIN);
- list_for_each_entry(walk_msg, &msq->q_messages, m_list) {
-
- if (testmsg(walk_msg, msgtyp, mode) &&
- !security_msg_queue_msgrcv(msq, walk_msg, current,
- msgtyp, mode)) {
-
- msg = walk_msg;
- if (mode == SEARCH_LESSEQUAL &&
- walk_msg->m_type != 1) {
- msgtyp = walk_msg->m_type - 1;
- } else if (mode == SEARCH_NUMBER) {
- if (msgtyp == msg_counter)
- break;
- msg = ERR_PTR(-EAGAIN);
- } else
- break;
- msg_counter++;
- }
- }
+ msg = find_msg(msq, &msgtyp, mode);
+
if (!IS_ERR(msg)) {
/*
* Found a suitable message.