On 7/17/19 1:06 AM, jun.li@xxxxxxx wrote:
From: Li Jun <jun.li@xxxxxxx>
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@xxxxxxxxxxxxxxx # v4.15+
Fixes: 4b4e02c83167 ("typec: tcpm: Move out of staging")
Signed-off-by: Li Jun <jun.li@xxxxxxx>
Reviewed-by: Guenter Roeck <linux@xxxxxxxxxxxx>
---
drivers/usb/typec/tcpm/tcpm.c | 4 ++++
1 file changed, 4 insertions(+)
diff --git a/drivers/usb/typec/tcpm/tcpm.c b/drivers/usb/typec/tcpm/tcpm.c
index 1249d8e..86e4552 100644
--- a/drivers/usb/typec/tcpm/tcpm.c
+++ b/drivers/usb/typec/tcpm/tcpm.c
@@ -596,6 +596,10 @@ static void tcpm_debugfs_exit(struct tcpm_port *port)
mutex_unlock(&port->logbuffer_lock);
debugfs_remove(port->dentry);
+ if (list_empty(&rootdir->d_subdirs)) {
+ debugfs_remove(rootdir);
+ rootdir = NULL;
+ }
}
#else
