[PATCH 5.2 041/144] usb: typec: tcpm: free log buf memory when remove debug file

[Greg Kroah-Hartman]

From: Li Jun <jun.li@xxxxxxx>

commit fd5da3e2cc61b4a7c877172fdc9348c82cf6ccfc upstream.

The logbuffer memory should be freed when remove debug file.

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>
Link: https://lore.kernel.org/r/20190717080646.30421-1-jun.li@xxxxxxx
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>

---
 drivers/usb/typec/tcpm/tcpm.c |    9 +++++++++
 1 file changed, 9 insertions(+)

--- a/drivers/usb/typec/tcpm/tcpm.c
+++ b/drivers/usb/typec/tcpm/tcpm.c
@@ -586,6 +586,15 @@ static void tcpm_debugfs_init(struct tcp
 
 static void tcpm_debugfs_exit(struct tcpm_port *port)
 {
+	int i;
+
+	mutex_lock(&port->logbuffer_lock);
+	for (i = 0; i < LOG_BUFFER_ENTRIES; i++) {
+		kfree(port->logbuffer[i]);
+		port->logbuffer[i] = NULL;
+	}
+	mutex_unlock(&port->logbuffer_lock);
+
 	debugfs_remove(port->dentry);
 }