linux-kernel - [PATCH 4.19 28/91] usb: typec: tcpm: remove tcpm dir if no children

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Date:   Wed, 14 Aug 2019 19:00:51 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Li Jun <jun.li@....com>,
        Guenter Roeck <linux@...ck-us.net>
Subject: [PATCH 4.19 28/91] usb: typec: tcpm: remove tcpm dir if no children

From: Li Jun <jun.li@....com>

commit 12ca7297b8855c0af1848503d37196159b24e6b9 upstream.

If config tcpm as module, module unload will not remove tcpm dir,
then the next module load will have problem: the rootdir is NULL
but tcpm dir is still there, so tcpm_debugfs_init() will create
tcpm dir again with failure, fix it by remove the tcpm dir if no
children.

Cc: stable@...r.kernel.org # v4.15+
Fixes: 4b4e02c83167 ("typec: tcpm: Move out of staging")
Signed-off-by: Li Jun <jun.li@....com>
Reviewed-by: Guenter Roeck <linux@...ck-us.net>
Link: https://lore.kernel.org/r/20190717080646.30421-2-jun.li@nxp.com
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 drivers/usb/typec/tcpm.c |    4 ++++
 1 file changed, 4 insertions(+)

--- a/drivers/usb/typec/tcpm.c
+++ b/drivers/usb/typec/tcpm.c
@@ -595,6 +595,10 @@ static void tcpm_debugfs_exit(struct tcp
 	mutex_unlock(&port->logbuffer_lock);
 
 	debugfs_remove(port->dentry);
+	if (list_empty(&rootdir->d_subdirs)) {
+		debugfs_remove(rootdir);
+		rootdir = NULL;
+	}
 }
 
 #else