[PATCH v2 09/10] block: panic if block debugfs dir is not created

[Luis Chamberlain]

If DEBUG_FS is disabled we have another inline
blk_debugfs_register() which just returns 0.

If BLK_DEV_IO_TRACE is enabled we rely on the block debugfs
directory to have been created. If BLK_DEV_IO_TRACE is not enabled
though, but if debugfs is still enabled we will always create a
debugfs directory for a request_queue. Instead of special-casing
this just for BLK_DEV_IO_TRACE, ensure this block debugfs dir is
always created at boot if we have enabled debugfs.

Signed-off-by: Luis Chamberlain <mcgrof@xxxxxxxxxx>
---
 block/blk-debugfs.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/block/blk-debugfs.c b/block/blk-debugfs.c
index 761318dcbf40..d6ec980e7531 100644
--- a/block/blk-debugfs.c
+++ b/block/blk-debugfs.c
@@ -15,6 +15,8 @@ struct dentry *blk_debugfs_root;
 void blk_debugfs_register(void)
 {
 	blk_debugfs_root = debugfs_create_dir("block", NULL);
+	if (!blk_debugfs_root)
+		panic("Failed to create block debugfs directory\n");
 }
 
 int __must_check blk_queue_debugfs_register(struct request_queue *q)
-- 
2.25.1