[PATCH 1/3] usb: typec: tcpm: Use usb_debug_root as root for our debugfs entry

[Hans de Goede]

Use usb_debug_root as root for our debugfs entry instead of creating our
own subdirectory under the debugfs root.

Another patch in this series will make the same change to the fusb302
driver, which also uses dev_name() (on the same device) for the debugfs
entry name. So we also prefix dev_name() with "tcpm-" here to avoid a
name conflict.

Signed-off-by: Hans de Goede <hdego...@redhat.com>
---
 drivers/usb/typec/tcpm/tcpm.c | 17 +++++------------
 1 file changed, 5 insertions(+), 12 deletions(-)

diff --git a/drivers/usb/typec/tcpm/tcpm.c b/drivers/usb/typec/tcpm/tcpm.c
index 15abe1d9958f..5241d17c3399 100644
--- a/drivers/usb/typec/tcpm/tcpm.c
+++ b/drivers/usb/typec/tcpm/tcpm.c
@@ -19,6 +19,7 @@
 #include <linux/seq_file.h>
 #include <linux/slab.h>
 #include <linux/spinlock.h>
+#include <linux/usb.h>
 #include <linux/usb/pd.h>
 #include <linux/usb/pd_ado.h>
 #include <linux/usb/pd_bdo.h>
@@ -571,17 +572,13 @@ static int tcpm_debug_show(struct seq_file *s, void *v)
 }
 DEFINE_SHOW_ATTRIBUTE(tcpm_debug);
 
-static struct dentry *rootdir;
-
 static void tcpm_debugfs_init(struct tcpm_port *port)
 {
-       mutex_init(&port->logbuffer_lock);
-       /* /sys/kernel/debug/tcpm/usbcX */
-       if (!rootdir)
-               rootdir = debugfs_create_dir("tcpm", NULL);
+       char name[NAME_MAX];
 
-       port->dentry = debugfs_create_file(dev_name(port->dev),
-                                          S_IFREG | 0444, rootdir,
+       mutex_init(&port->logbuffer_lock);
+       snprintf(name, NAME_MAX, "tcpm-%s", dev_name(port->dev));
+       port->dentry = debugfs_create_file(name, S_IFREG | 0444, usb_debug_root,
                                           port, &tcpm_debug_fops);
 }
 
@@ -597,10 +594,6 @@ 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
-- 
2.23.0.rc2