On Tue, Jun 04, 2019 at 11:32:58AM +0200, Greg Kroah-Hartman wrote:
> The USB gadget subsystem wants to use the USB debugfs root directory, so
> move it to the common "core" USB code so that it is properly initialized
> and removed as needed.
>
> Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
>
> ---
>
> This should be the "correct" version of this, Chunfeng, can you test
> this to verify it works for you?
>
>
> diff --git a/drivers/usb/common/common.c b/drivers/usb/common/common.c
> index 18f5dcf58b0d..3b5e4263ffef 100644
> --- a/drivers/usb/common/common.c
> +++ b/drivers/usb/common/common.c
> @@ -15,6 +15,7 @@
> #include <linux/usb/of.h>
> #include <linux/usb/otg.h>
> #include <linux/of_platform.h>
> +#include <linux/debugfs.h>
>
> static const char *const ep_type_names[] = {
> [USB_ENDPOINT_XFER_CONTROL] = "ctrl",
> @@ -291,4 +292,21 @@ struct device *usb_of_get_companion_dev(struct device *dev)
> EXPORT_SYMBOL_GPL(usb_of_get_companion_dev);
> #endif
>
> +struct dentry *usb_debug_root;
> +EXPORT_SYMBOL_GPL(usb_debug_root);
> +
> +static int usb_common_init(void)
> +{
> + usb_debug_root = debugfs_create_dir("usb", NULL);
> + return 0;
> +}
> +
> +static void usb_common_exit(void)
> +{
> + debugfs_remove_recursive(usb_debug_root);
> +}
> +
> +module_init(usb_common_init);
> +module_exit(usb_common_exit);
> +
> MODULE_LICENSE("GPL");
> diff --git a/drivers/usb/core/usb.c b/drivers/usb/core/usb.c
> index 7fcb9f782931..f3d6b1ab80cb 100644
> --- a/drivers/usb/core/usb.c
> +++ b/drivers/usb/core/usb.c
> @@ -1185,19 +1185,17 @@ static struct notifier_block usb_bus_nb = {
> .notifier_call = usb_bus_notify,
> };
>
> -struct dentry *usb_debug_root;
> -EXPORT_SYMBOL_GPL(usb_debug_root);
> +static struct dentry *usb_devices_root;
>
> static void usb_debugfs_init(void)
> {
> - usb_debug_root = debugfs_create_dir("usb", NULL);
> - debugfs_create_file("devices", 0444, usb_debug_root, NULL,
> - &usbfs_devices_fops);
> + usb_devices_root = debugfs_create_file("devices", 0444, usb_debug_root,
> + NULL, &usbfs_devices_fops);
> }
>
> static void usb_debugfs_cleanup(void)
> {
> - debugfs_remove_recursive(usb_debug_root);
> + debugfs_remove_recursive(usb_devices_root);
That should just be debugfs_remove();
I'll fix it up after someone tests this :)
thanks,
greg k-h
