drivers/usb/gadget/function/u_ether_configfs.h

File Facts

System

Linux kernel

Corpus path

drivers/usb/gadget/function/u_ether_configfs.h

Extension

.h

Size

5590 bytes

Lines

201

Domain

Driver Families

Bucket

drivers/usb

Inferred role

Driver Families: implementation source

Status

source implementation candidate

Why This File Exists

Repeatable hardware-adapter layer. Deep compatibility for every driver is out of scope; this atlas records patterns, probe lifecycles, bus glue, IRQ/DMA usage, and links back to core abstractions.

• Repeatable hardware-adapter layer. Deep compatibility for every driver is out of scope; this atlas records patterns, probe lifecycles, bus glue, IRQ/DMA usage, and links back to core abstractions.
• Uses kernel synchronization; read lock ordering, sleepability, and interrupt context assumptions before translating.
• Defines or uses C structs; map object ownership, embedded links, reference counts, and lock ownership.

Dependency Surface

• No C-style include directives detected by the generator.

Detected Declarations

• No top-level syscall, struct, function, initcall, or export declaration detected by the generator.

Annotated Snippet

if (opts->refcnt) {					\
			mutex_unlock(&opts->lock);			\
			return -EBUSY;					\
		}							\
									\
		ret = gether_set_dev_addr(opts->net, page);		\
		mutex_unlock(&opts->lock);				\
		if (!ret)						\
			ret = len;					\
		return ret;						\
	}								\
									\
	CONFIGFS_ATTR(_f_##_opts_, dev_addr)

#define USB_ETHERNET_CONFIGFS_ITEM_ATTR_HOST_ADDR(_f_)			\
	static ssize_t _f_##_opts_host_addr_show(struct config_item *item, \
						 char *page)		\
	{								\
		struct f_##_f_##_opts *opts = to_f_##_f_##_opts(item);	\
		int result;						\
									\
		mutex_lock(&opts->lock);				\
		result = gether_get_host_addr(opts->net, page, PAGE_SIZE); \
		mutex_unlock(&opts->lock);				\
									\
		return result;						\
	}								\
									\
	static ssize_t _f_##_opts_host_addr_store(struct config_item *item, \
						  const char *page, size_t len)\
	{								\
		struct f_##_f_##_opts *opts = to_f_##_f_##_opts(item);	\
		int ret;						\
									\
		mutex_lock(&opts->lock);				\
		if (opts->refcnt) {					\
			mutex_unlock(&opts->lock);			\
			return -EBUSY;					\
		}							\
									\
		ret = gether_set_host_addr(opts->net, page);		\
		mutex_unlock(&opts->lock);				\
		if (!ret)						\
			ret = len;					\
		return ret;						\
	}								\
									\
	CONFIGFS_ATTR(_f_##_opts_, host_addr)

#define USB_ETHERNET_CONFIGFS_ITEM_ATTR_QMULT(_f_)			\
	static ssize_t _f_##_opts_qmult_show(struct config_item *item,	\
					     char *page)		\
	{								\
		struct f_##_f_##_opts *opts = to_f_##_f_##_opts(item);	\
		unsigned qmult;						\
									\
		mutex_lock(&opts->lock);				\
		qmult = gether_get_qmult(opts->net);			\
		mutex_unlock(&opts->lock);				\
		return sprintf(page, "%d\n", qmult);			\
	}								\
									\
	static ssize_t _f_##_opts_qmult_store(struct config_item *item, \
					      const char *page, size_t len)\
	{								\
		struct f_##_f_##_opts *opts = to_f_##_f_##_opts(item);	\
		u8 val;							\
		int ret;						\
									\
		mutex_lock(&opts->lock);				\
		if (opts->refcnt) {					\
			ret = -EBUSY;					\
			goto out;					\
		}							\
									\
		ret = kstrtou8(page, 0, &val);				\
		if (ret)						\
			goto out;					\
									\
		gether_set_qmult(opts->net, val);			\
		ret = len;						\
out:									\
		mutex_unlock(&opts->lock);				\
		return ret;						\
	}								\
									\
	CONFIGFS_ATTR(_f_##_opts_, qmult)

#define USB_ETHERNET_CONFIGFS_ITEM_ATTR_IFNAME(_f_)			\
	static ssize_t _f_##_opts_ifname_show(struct config_item *item, \

Annotation

• Atlas domain: Driver Families / drivers/usb.
• Implementation status: source implementation candidate.
• Synchronization appears in or near this file; preserve lock ordering, sleepability, and interrupt-context constraints.

Implementation Notes

• This generated page is the file-by-file coverage layer; curated subsystem chapters should link here when they synthesize a multi-file control flow.
• Core OS pages should be promoted from atlas-only to deep-reviewed when they explain data structures, invariants, locking, lifecycle, and C implementation snippets.
• Driver-family pages are intentionally pattern-oriented unless they are part of the selected PCIe/NVMe representative device path.