usb: gadget: configfs: remove os_desc_attr_release()

it is not allow to create sub group under os_desc,

/sys/kernel/config/usb_gadget/dummy/os_desc # mkdir dummy
mkdir: can't create directory 'dummy': Operation not permitted

no one will kmalloc() os_desc entry and kfree(os_desc) will never be called.
static void os_desc_attr_release(struct config_item *item)
{
       struct os_desc *os_desc = to_os_desc(item);
       kfree(os_desc);
}

remove struct os_desc definition, to_os_desc() and os_desc_attr_release().

Reviewed-by: Jack Pham <quic_jackp@quicinc.com>
Signed-off-by: Linyu Yuan <quic_linyyuan@quicinc.com>
Link: https://lore.kernel.org/r/1637211213-16400-3-git-send-email-quic_linyyuan@quicinc.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/usb/gadget/configfs.c b/drivers/usb/gadget/configfs.c
index ac35fea..ae0890a 100644 (file)
--- a/drivers/usb/gadget/configfs.c
+++ b/drivers/usb/gadget/configfs.c
@@ -89,10 +89,6 @@ struct gadget_strings {
        struct list_head list;
 };
 
-struct os_desc {
-       struct config_group group;
-};
-
 struct gadget_config_name {
        struct usb_gadget_strings stringtab_dev;
        struct usb_string strings;
@@ -783,11 +779,6 @@ static void gadget_strings_attr_release(struct config_item *item)
 USB_CONFIG_STRING_RW_OPS(gadget_strings);
 USB_CONFIG_STRINGS_LANG(gadget_strings, gadget_info);
 
-static inline struct os_desc *to_os_desc(struct config_item *item)
-{
-       return container_of(to_config_group(item), struct os_desc, group);
-}
-
 static inline struct gadget_info *os_desc_item_to_gadget_info(
                struct config_item *item)
 {
@@ -887,12 +878,6 @@ static struct configfs_attribute *os_desc_attrs[] = {
        NULL,
 };
 
-static void os_desc_attr_release(struct config_item *item)
-{
-       struct os_desc *os_desc = to_os_desc(item);
-       kfree(os_desc);
-}
-
 static int os_desc_link(struct config_item *os_desc_ci,
                        struct config_item *usb_cfg_ci)
 {
@@ -942,7 +927,6 @@ static void os_desc_unlink(struct config_item *os_desc_ci,
 }
 
 static struct configfs_item_operations os_desc_ops = {
-       .release                = os_desc_attr_release,
        .allow_link             = os_desc_link,
        .drop_link              = os_desc_unlink,
 };