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usb: gadget: configfs: simplify os_desc_item_to_gadget_info() helper 

since os_desc_group is already a member of struct gadget_info,
we can simply just use container_of() to retrieve the latter,
without needing to dereference the cg_item's parent pointer.

use os_desc_item_to_gadget_info() helper in os_desc (un)link function.

Reviewed-by: Jack Pham <quic_jackp@quicinc.com>
Signed-off-by: Linyu Yuan <quic_linyyuan@quicinc.com>
Link: https://lore.kernel.org/r/1637211213-16400-2-git-send-email-quic_linyyuan@quicinc.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Linyu Yuan 2021-11-18 12:53:30 +08:00 committed by Greg Kroah-Hartman
parent e4ac5a40ce
commit 167a799c6e
1 changed files with 4 additions and 5 deletions
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9
drivers/usb/gadget/configfs.c
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@ -791,7 +791,8 @@ static inline struct os_desc *to_os_desc(struct config_item *item)
static inline struct gadget_info *os_desc_item_to_gadget_info(
struct config_item *item)
{
return to_gadget_info(to_os_desc(item)->group.cg_item.ci_parent);
return container_of(to_config_group(item),
struct gadget_info, os_desc_group);
}
static ssize_t os_desc_use_show(struct config_item *item, char *page)
@ -895,8 +896,7 @@ static void os_desc_attr_release(struct config_item *item)
static int os_desc_link(struct config_item *os_desc_ci,
struct config_item *usb_cfg_ci)
{
struct gadget_info *gi = container_of(to_config_group(os_desc_ci),
struct gadget_info, os_desc_group);
struct gadget_info *gi = os_desc_item_to_gadget_info(os_desc_ci);
struct usb_composite_dev *cdev = &gi->cdev;
struct config_usb_cfg *c_target =
container_of(to_config_group(usb_cfg_ci),
@ -930,8 +930,7 @@ out:
static void os_desc_unlink(struct config_item *os_desc_ci,
struct config_item *usb_cfg_ci)
{
struct gadget_info *gi = container_of(to_config_group(os_desc_ci),
struct gadget_info, os_desc_group);
struct gadget_info *gi = os_desc_item_to_gadget_info(os_desc_ci);
struct usb_composite_dev *cdev = &gi->cdev;
mutex_lock(&gi->lock);