mtip32xx: Fix NULL pointer dereference during module unload
An open file-handle to one or more of the driver exported debugfs
nodes causes raciness in recursive removal during module unload;
sometimes a stale parent dentry is dereferenced when more than 1
pci device is present.
Signed-off-by: Sam Bradshaw <sbradshaw@micron.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
diff --git a/drivers/block/mtip32xx/mtip32xx.c b/drivers/block/mtip32xx/mtip32xx.c
index 847107e..e366c74 100644
--- a/drivers/block/mtip32xx/mtip32xx.c
+++ b/drivers/block/mtip32xx/mtip32xx.c
@@ -3002,7 +3002,8 @@
static void mtip_hw_debugfs_exit(struct driver_data *dd)
{
- debugfs_remove_recursive(dd->dfs_node);
+ if (dd->dfs_node)
+ debugfs_remove_recursive(dd->dfs_node);
}