block: drop references taken by class_find_device()

Otherwise we leak references, which is not a good thing to do.

Signed-off-by: Kay Sievers <kay.sievers@vrfy.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

diff --git a/block/genhd.c b/block/genhd.c
index f34befc5484737a446f66da8afd81cf1b993b499..656c2c7abf999628e1232024b71c4af2f22a1ac9 100644 (file)
--- a/block/genhd.c
+++ b/block/genhd.c
@@ -313,8 +313,10 @@ static void *part_start(struct seq_file *part, loff_t *pos)
 
        mutex_lock(&block_class_lock);
        dev = class_find_device(&block_class, NULL, &k, find_start);
-       if (dev)
+       if (dev) {
+               put_device(dev);
                return dev_to_disk(dev);
+       }
        return NULL;
 }
 
@@ -331,8 +333,10 @@ static void *part_next(struct seq_file *part, void *v, loff_t *pos)
        struct device *dev;
        ++*pos;
        dev = class_find_device(&block_class, &gp->dev, NULL, find_next);
-       if (dev)
+       if (dev) {
+               put_device(dev);
                return dev_to_disk(dev);
+       }
        return NULL;
 }
 
@@ -573,8 +577,10 @@ static void *diskstats_start(struct seq_file *part, loff_t *pos)
 
        mutex_lock(&block_class_lock);
        dev = class_find_device(&block_class, NULL, &k, find_start);
-       if (dev)
+       if (dev) {
+               put_device(dev);
                return dev_to_disk(dev);
+       }
        return NULL;
 }
 
@@ -585,8 +591,10 @@ static void *diskstats_next(struct seq_file *part, void *v, loff_t *pos)
 
        ++*pos;
        dev = class_find_device(&block_class, &gp->dev, NULL, find_next);
-       if (dev)
+       if (dev) {
+               put_device(dev);
                return dev_to_disk(dev);
+       }
        return NULL;
 }
 
@@ -714,10 +722,12 @@ dev_t blk_lookup_devt(const char *name, int part)
        mutex_lock(&block_class_lock);
        find.name = name;
        find.part = part;
-       dev = class_find_device(&block_class, NULL, (void *)&find, match_id);
-       if (dev)
+       dev = class_find_device(&block_class, NULL, &find, match_id);
+       if (dev) {
+               put_device(dev);
                devt = MKDEV(MAJOR(dev->devt),
                             MINOR(dev->devt) + part);
+       }
        mutex_unlock(&block_class_lock);
 
        return devt;