pinctrl: free debugfs entries when unloading a pinmux driver

We were not cleaning up properly after unloading a pinmux
driver compiled as module.

Signed-off-by: Tony Lindgren <tony@atomide.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>

2 files changed, 16 insertions, 1 deletions

diff --git a/drivers/pinctrl/core.c b/drivers/pinctrl/core.c
index 569bdb3ef10..d9d35fcbfc6 100644
--- a/drivers/pinctrl/core.c
+++ b/drivers/pinctrl/core.c
@@ -510,10 +510,12 @@ static struct dentry *debugfs_root;
 
 static void pinctrl_init_device_debugfs(struct pinctrl_dev *pctldev)
 {
-        static struct dentry *device_root;
+        struct dentry *device_root;
 
         device_root = debugfs_create_dir(dev_name(pctldev->dev),
                                          debugfs_root);
+        pctldev->device_root = device_root;
+
         if (IS_ERR(device_root) || !device_root) {
                 pr_warn("failed to create debugfs directory for %s\n",
                         dev_name(pctldev->dev));
@@ -529,6 +531,11 @@ static void pinctrl_init_device_debugfs(struct pinctrl_dev *pctldev)
         pinconf_init_device_debugfs(device_root, pctldev);
 }
 
+static void pinctrl_remove_device_debugfs(struct pinctrl_dev *pctldev)
+{
+        debugfs_remove_recursive(pctldev->device_root);
+}
+
 static void pinctrl_init_debugfs(void)
 {
         debugfs_root = debugfs_create_dir("pinctrl", NULL);
@@ -553,6 +560,10 @@ static void pinctrl_init_debugfs(void)
 {
 }
 
+static void pinctrl_remove_device_debugfs(struct pinctrl_dev *pctldev)
+{
+}
+
 #endif
 
 /**
@@ -641,6 +652,7 @@ void pinctrl_unregister(struct pinctrl_dev *pctldev)
         if (pctldev == NULL)
                 return;
 
+        pinctrl_remove_device_debugfs(pctldev);
         pinmux_unhog_maps(pctldev);
         /* TODO: check that no pinmuxes are still active? */
         mutex_lock(&pinctrldev_list_mutex);
diff --git a/drivers/pinctrl/core.h b/drivers/pinctrl/core.h
index 177a3310547..cfa86da6b4b 100644
--- a/drivers/pinctrl/core.h
+++ b/drivers/pinctrl/core.h
@@ -41,6 +41,9 @@ struct pinctrl_dev {
         struct device *dev;
         struct module *owner;
         void *driver_data;
+#ifdef CONFIG_DEBUG_FS
+        struct dentry *device_root;
+#endif
 #ifdef CONFIG_PINMUX
         struct mutex pinmux_hogs_lock;
         struct list_head pinmux_hogs;