ipc: rename ids->rw_mutex

Since in some situations the lock can be shared for readers, we shouldn't
be calling it a mutex, rename it to rwsem.

Signed-off-by: Davidlohr Bueso <davidlohr.bueso@hp.com>
Tested-by: Sedat Dilek <sedat.dilek@gmail.com>
Cc: Rik van Riel <riel@redhat.com>
Cc: Manfred Spraul <manfred@colorfullife.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 14 insertions, 14 deletions

diff --git a/ipc/util.c b/ipc/util.c
index 2c8a93b380ba..9a1d779a20e2 100644
--- a/ipc/util.c
+++ b/ipc/util.c
@@ -119,7 +119,7 @@ __initcall(ipc_init);
  
 void ipc_init_ids(struct ipc_ids *ids)
 {
-        init_rwsem(&ids->rw_mutex);
+        init_rwsem(&ids->rwsem);
 
         ids->in_use = 0;
         ids->seq = 0;
@@ -174,7 +174,7 @@ void __init ipc_init_proc_interface(const char *path, const char *header,
  *      @ids: Identifier set
  *      @key: The key to find
  *      
- *      Requires ipc_ids.rw_mutex locked.
+ *      Requires ipc_ids.rwsem locked.
  *      Returns the LOCKED pointer to the ipc structure if found or NULL
  *      if not.
  *      If key is found ipc points to the owning ipc structure
@@ -208,7 +208,7 @@ static struct kern_ipc_perm *ipc_findkey(struct ipc_ids *ids, key_t key)
  *      ipc_get_maxid   -       get the last assigned id
  *      @ids: IPC identifier set
  *
- *      Called with ipc_ids.rw_mutex held.
+ *      Called with ipc_ids.rwsem held.
  */
 
 int ipc_get_maxid(struct ipc_ids *ids)
@@ -246,7 +246,7 @@ int ipc_get_maxid(struct ipc_ids *ids)
  *      is returned. The 'new' entry is returned in a locked state on success.
  *      On failure the entry is not locked and a negative err-code is returned.
  *
- *      Called with writer ipc_ids.rw_mutex held.
+ *      Called with writer ipc_ids.rwsem held.
  */
 int ipc_addid(struct ipc_ids* ids, struct kern_ipc_perm* new, int size)
 {
@@ -312,9 +312,9 @@ static int ipcget_new(struct ipc_namespace *ns, struct ipc_ids *ids,
 {
         int err;
 
-        down_write(&ids->rw_mutex);
+        down_write(&ids->rwsem);
         err = ops->getnew(ns, params);
-        up_write(&ids->rw_mutex);
+        up_write(&ids->rwsem);
         return err;
 }
 
@@ -331,7 +331,7 @@ static int ipcget_new(struct ipc_namespace *ns, struct ipc_ids *ids,
  *
  *      On success, the IPC id is returned.
  *
- *      It is called with ipc_ids.rw_mutex and ipcp->lock held.
+ *      It is called with ipc_ids.rwsem and ipcp->lock held.
  */
 static int ipc_check_perms(struct ipc_namespace *ns,
                            struct kern_ipc_perm *ipcp,
@@ -376,7 +376,7 @@ static int ipcget_public(struct ipc_namespace *ns, struct ipc_ids *ids,
          * Take the lock as a writer since we are potentially going to add
          * a new entry + read locks are not "upgradable"
          */
-        down_write(&ids->rw_mutex);
+        down_write(&ids->rwsem);
         ipcp = ipc_findkey(ids, params->key);
         if (ipcp == NULL) {
                 /* key not used */
@@ -402,7 +402,7 @@ static int ipcget_public(struct ipc_namespace *ns, struct ipc_ids *ids,
                 }
                 ipc_unlock(ipcp);
         }
-        up_write(&ids->rw_mutex);
+        up_write(&ids->rwsem);
 
         return err;
 }
@@ -413,7 +413,7 @@ static int ipcget_public(struct ipc_namespace *ns, struct ipc_ids *ids,
  *      @ids: IPC identifier set
  *      @ipcp: ipc perm structure containing the identifier to remove
  *
- *      ipc_ids.rw_mutex (as a writer) and the spinlock for this ID are held
+ *      ipc_ids.rwsem (as a writer) and the spinlock for this ID are held
  *      before this function is called, and remain locked on the exit.
  */
  
@@ -621,7 +621,7 @@ struct kern_ipc_perm *ipc_obtain_object(struct ipc_ids *ids, int id)
 }
 
 /**
- * ipc_lock - Lock an ipc structure without rw_mutex held
+ * ipc_lock - Lock an ipc structure without rwsem held
  * @ids: IPC identifier set
  * @id: ipc id to look for
  *
@@ -748,7 +748,7 @@ int ipc_update_perm(struct ipc64_perm *in, struct kern_ipc_perm *out)
  *  - performs some audit and permission check, depending on the given cmd
  *  - returns a pointer to the ipc object or otherwise, the corresponding error.
  *
- * Call holding the both the rw_mutex and the rcu read lock.
+ * Call holding the both the rwsem and the rcu read lock.
  */
 struct kern_ipc_perm *ipcctl_pre_down_nolock(struct ipc_namespace *ns,
                                         struct ipc_ids *ids, int id, int cmd,
@@ -868,7 +868,7 @@ static void *sysvipc_proc_start(struct seq_file *s, loff_t *pos)
          * Take the lock - this will be released by the corresponding
          * call to stop().
          */
-        down_read(&ids->rw_mutex);
+        down_read(&ids->rwsem);
 
         /* pos < 0 is invalid */
         if (*pos < 0)
@@ -895,7 +895,7 @@ static void sysvipc_proc_stop(struct seq_file *s, void *it)
 
         ids = &iter->ns->ids[iface->ids];
         /* Release the lock we took in start() */
-        up_read(&ids->rw_mutex);
+        up_read(&ids->rwsem);
 }
 
 static int sysvipc_proc_show(struct seq_file *s, void *it)