[PATCH] SELinux: convert sbsec semaphore to a mutex

This patch converts the semaphore in the superblock security struct to a
mutex.  No locking changes or other code changes are done.
Signed-off-by: NEric Paris <eparis@redhat.com>
Acked-by: NStephen Smalley <sds@tycho.nsa.gov>
Acked-by: NJames Morris <jmorris@namei.org>
Signed-off-by: NAndrew Morton <akpm@osdl.org>
Signed-off-by: NLinus Torvalds <torvalds@osdl.org>

security/selinux/hooks.c

@@ -51,7 +51,6 @@
 #include <net/ip.h>		/* for sysctl_local_port_range[] */
 #include <net/tcp.h>		/* struct or_callable used in sock_rcv_skb */
 #include <asm/uaccess.h>
-#include <asm/semaphore.h>
 #include <asm/ioctls.h>
 #include <linux/bitops.h>
 #include <linux/interrupt.h>
@@ -243,7 +242,7 @@ static int superblock_alloc_security(struct super_block *sb)
 	if (!sbsec)
 		return -ENOMEM;
 
-	init_MUTEX(&sbsec->sem);
+	mutex_init(&sbsec->lock);
 	INIT_LIST_HEAD(&sbsec->list);
 	INIT_LIST_HEAD(&sbsec->isec_head);
 	spin_lock_init(&sbsec->isec_lock);
@@ -595,7 +594,7 @@ static int superblock_doinit(struct super_block *sb, void *data)
 	struct inode *inode = root->d_inode;
 	int rc = 0;
 
-	down(&sbsec->sem);
+	mutex_lock(&sbsec->lock);
 	if (sbsec->initialized)
 		goto out;
 
@@ -690,7 +689,7 @@ static int superblock_doinit(struct super_block *sb, void *data)
 	}
 	spin_unlock(&sbsec->isec_lock);
 out:
-	up(&sbsec->sem);
+	mutex_unlock(&sbsec->lock);
 	return rc;
 }
 

security/selinux/include/objsec.h

@@ -63,7 +63,7 @@ struct superblock_security_struct {
 	unsigned int behavior;          /* labeling behavior */
 	unsigned char initialized;      /* initialization flag */
 	unsigned char proc;             /* proc fs */
-	struct semaphore sem;
+	struct mutex lock;
 	struct list_head isec_head;
 	spinlock_t isec_lock;
 };