unix98 allocated_ptys_lock semaphore to mutex

Convert the unix98 allocated_ptys_lock to a mutex.

Signed-off-by: Daniel Walker <dwalker@mvista.com>
Acked-by: Ingo Molnar <mingo@elte.hu>
Cc: "H. Peter Anvin" <hpa@zytor.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 10 insertions, 10 deletions

diff --git a/drivers/char/tty_io.c b/drivers/char/tty_io.c
index b62bb67c3414..79c86c47947f 100644
--- a/drivers/char/tty_io.c
+++ b/drivers/char/tty_io.c
@@ -138,7 +138,7 @@ EXPORT_SYMBOL(tty_mutex);
 extern struct tty_driver *ptm_driver;   /* Unix98 pty masters; for /dev/ptmx */
 extern int pty_limit;           /* Config limit on Unix98 ptys */
 static DEFINE_IDR(allocated_ptys);
-static DECLARE_MUTEX(allocated_ptys_lock);
+static DEFINE_MUTEX(allocated_ptys_lock);
 static int ptmx_open(struct inode *, struct file *);
 #endif
 
@@ -2571,9 +2571,9 @@ static void release_dev(struct file * filp)
 #ifdef CONFIG_UNIX98_PTYS
         /* Make this pty number available for reallocation */
         if (devpts) {
-                down(&allocated_ptys_lock);
+                mutex_lock(&allocated_ptys_lock);
                 idr_remove(&allocated_ptys, idx);
-                up(&allocated_ptys_lock);
+                mutex_unlock(&allocated_ptys_lock);
         }
 #endif
 
@@ -2737,24 +2737,24 @@ static int ptmx_open(struct inode * inode, struct file * filp)
         nonseekable_open(inode, filp);
 
         /* find a device that is not in use. */
-        down(&allocated_ptys_lock);
+        mutex_lock(&allocated_ptys_lock);
         if (!idr_pre_get(&allocated_ptys, GFP_KERNEL)) {
-                up(&allocated_ptys_lock);
+                mutex_unlock(&allocated_ptys_lock);
                 return -ENOMEM;
         }
         idr_ret = idr_get_new(&allocated_ptys, NULL, &index);
         if (idr_ret < 0) {
-                up(&allocated_ptys_lock);
+                mutex_unlock(&allocated_ptys_lock);
                 if (idr_ret == -EAGAIN)
                         return -ENOMEM;
                 return -EIO;
         }
         if (index >= pty_limit) {
                 idr_remove(&allocated_ptys, index);
-                up(&allocated_ptys_lock);
+                mutex_unlock(&allocated_ptys_lock);
                 return -EIO;
         }
-        up(&allocated_ptys_lock);
+        mutex_unlock(&allocated_ptys_lock);
 
         mutex_lock(&tty_mutex);
         retval = init_dev(ptm_driver, index, &tty);
@@ -2781,9 +2781,9 @@ out1:
         release_dev(filp);
         return retval;
 out:
-        down(&allocated_ptys_lock);
+        mutex_lock(&allocated_ptys_lock);
         idr_remove(&allocated_ptys, index);
-        up(&allocated_ptys_lock);
+        mutex_unlock(&allocated_ptys_lock);
         return retval;
 }
 #endif