device-dax: fix 'dax' device filesystem inode destruction crash

[uclinux-h8/linux.git] / drivers / dax / super.c

diff --git a/drivers/dax/super.c b/drivers/dax/super.c
index 6ed32aa..922d082 100644 (file)
--- a/drivers/dax/super.c
+++ b/drivers/dax/super.c
@@ -210,9 +210,12 @@ EXPORT_SYMBOL_GPL(kill_dax);
 static struct inode *dax_alloc_inode(struct super_block *sb)
 {
        struct dax_device *dax_dev;
+       struct inode *inode;
 
        dax_dev = kmem_cache_alloc(dax_cache, GFP_KERNEL);
-       return &dax_dev->inode;
+       inode = &dax_dev->inode;
+       inode->i_rdev = 0;
+       return inode;
 }
 
 static struct dax_device *to_dax_dev(struct inode *inode)
@@ -227,7 +230,8 @@ static void dax_i_callback(struct rcu_head *head)
 
        kfree(dax_dev->host);
        dax_dev->host = NULL;
-       ida_simple_remove(&dax_minor_ida, MINOR(inode->i_rdev));
+       if (inode->i_rdev)
+               ida_simple_remove(&dax_minor_ida, MINOR(inode->i_rdev));
        kmem_cache_free(dax_cache, dax_dev);
 }
 
@@ -423,6 +427,7 @@ static void init_once(void *_dax_dev)
        struct dax_device *dax_dev = _dax_dev;
        struct inode *inode = &dax_dev->inode;
 
+       memset(dax_dev, 0, sizeof(*dax_dev));
        inode_init_once(inode);
 }