X-Git-Url: http://git.monstr.eu/?p=linux-2.6-microblaze.git;a=blobdiff_plain;f=block%2Fgenhd.c;h=7b6e5e1cf95642adaa6a6fb53e902b6466d1f0f7;hp=567549a011d18cc3f784042969365030222762b4;hb=b5b65f1398274fd726eca87dbebd39f3e603348a;hpb=7b871c7713d1eafc3a614883bbdf68ab1dffa883

diff --git a/block/genhd.c b/block/genhd.c
index 567549a011d1..7b6e5e1cf956 100644
--- a/block/genhd.c
+++ b/block/genhd.c
@@ -183,6 +183,7 @@ static struct blk_major_name {
 	void (*probe)(dev_t devt);
 } *major_names[BLKDEV_MAJOR_HASH_SIZE];
 static DEFINE_MUTEX(major_names_lock);
+static DEFINE_SPINLOCK(major_names_spinlock);
 
 /* index in the above - for now: assume no multimajor ranges */
 static inline int major_to_index(unsigned major)
@@ -195,11 +196,11 @@ void blkdev_show(struct seq_file *seqf, off_t offset)
 {
 	struct blk_major_name *dp;
 
-	mutex_lock(&major_names_lock);
+	spin_lock(&major_names_spinlock);
 	for (dp = major_names[major_to_index(offset)]; dp; dp = dp->next)
 		if (dp->major == offset)
 			seq_printf(seqf, "%3d %s\n", dp->major, dp->name);
-	mutex_unlock(&major_names_lock);
+	spin_unlock(&major_names_spinlock);
 }
 #endif /* CONFIG_PROC_FS */
 
@@ -271,6 +272,7 @@ int __register_blkdev(unsigned int major, const char *name,
 	p->next = NULL;
 	index = major_to_index(major);
 
+	spin_lock(&major_names_spinlock);
 	for (n = &major_names[index]; *n; n = &(*n)->next) {
 		if ((*n)->major == major)
 			break;
@@ -279,6 +281,7 @@ int __register_blkdev(unsigned int major, const char *name,
 		*n = p;
 	else
 		ret = -EBUSY;
+	spin_unlock(&major_names_spinlock);
 
 	if (ret < 0) {
 		printk("register_blkdev: cannot get major %u for %s\n",
@@ -298,6 +301,7 @@ void unregister_blkdev(unsigned int major, const char *name)
 	int index = major_to_index(major);
 
 	mutex_lock(&major_names_lock);
+	spin_lock(&major_names_spinlock);
 	for (n = &major_names[index]; *n; n = &(*n)->next)
 		if ((*n)->major == major)
 			break;
@@ -307,6 +311,7 @@ void unregister_blkdev(unsigned int major, const char *name)
 		p = *n;
 		*n = p->next;
 	}
+	spin_unlock(&major_names_spinlock);
 	mutex_unlock(&major_names_lock);
 	kfree(p);
 }