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USB: introduce usb_anchor

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- introduction of usb_anchor and its methods

Signed-off-by: Oliver Neukum <oneukum@suse.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
This commit is contained in:
Oliver Neukum
2007-05-25 13:40:56 +02:00
committed by Greg Kroah-Hartman
parent ffcdc18d64
commit 51a2f077c4
3 changed files with 123 additions and 3 deletions
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22
include/linux/usb.h
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@ -1000,11 +1000,26 @@ struct usb_iso_packet_descriptor {
struct urb;
struct usb_anchor {
struct list_head urb_list;
wait_queue_head_t wait;
spinlock_t lock;
};
static inline void init_usb_anchor(struct usb_anchor *anchor)
{
INIT_LIST_HEAD(&anchor->urb_list);
init_waitqueue_head(&anchor->wait);
spin_lock_init(&anchor->lock);
}
typedef void (*usb_complete_t)(struct urb *);
/**
* struct urb - USB Request Block
* @urb_list: For use by current owner of the URB.
* @anchor_list: membership in the list of an anchor
* @anchor: to anchor URBs to a common mooring
* @pipe: Holds endpoint number, direction, type, and more.
* Create these values with the eight macros available;
* usb_{snd,rcv}TYPEpipe(dev,endpoint), where the TYPE is "ctrl"
@ -1177,6 +1192,8 @@ struct urb
/* public: documented fields in the urb that can be used by drivers */
struct list_head urb_list; /* list head for use by the urb's
* current owner */
struct list_head anchor_list; /* the URB may be anchored by the driver */
struct usb_anchor *anchor;
struct usb_device *dev; /* (in) pointer to associated device */
unsigned int pipe; /* (in) pipe information */
int status; /* (return) non-ISO status */
@ -1312,6 +1329,11 @@ extern struct urb *usb_get_urb(struct urb *urb);
extern int usb_submit_urb(struct urb *urb, gfp_t mem_flags);
extern int usb_unlink_urb(struct urb *urb);
extern void usb_kill_urb(struct urb *urb);
extern void usb_kill_anchored_urbs(struct usb_anchor *anchor);
extern void usb_anchor_urb(struct urb *urb, struct usb_anchor *anchor);
extern void usb_unanchor_urb(struct urb *urb);
extern int usb_wait_anchor_empty_timeout(struct usb_anchor *anchor,
unsigned int timeout);
void *usb_buffer_alloc (struct usb_device *dev, size_t size,
gfp_t mem_flags, dma_addr_t *dma);