X-Git-Url: https://err.no/cgi-bin/gitweb.cgi?a=blobdiff_plain;f=include%2Flinux%2Fusb.h;h=2d1ac5058534cdd8db3ecb86233ab31d247e2c44;hb=d039ba24f135147f60a13bcaa768189a5b773b6e;hp=41d1a644c9d43aa8206cf2b6e708c4a8173b7fd2;hpb=a9e4820c4c170b3df0d2185f7b4130b0b2daed2c;p=linux-2.6

diff --git a/include/linux/usb.h b/include/linux/usb.h
index 41d1a644c9..2d1ac50585 100644
--- a/include/linux/usb.h
+++ b/include/linux/usb.h
@@ -796,6 +796,10 @@ typedef void (*usb_complete_t)(struct urb *, struct pt_regs *);
  * of the iso_frame_desc array, and the number of errors is reported in
  * error_count.  Completion callbacks for ISO transfers will normally
  * (re)submit URBs to ensure a constant transfer rate.
+ *
+ * Note that even fields marked "public" should not be touched by the driver
+ * when the urb is owned by the hcd, that is, since the call to
+ * usb_submit_urb() till the entry into the completion routine.
  */
 struct urb
 {
@@ -803,12 +807,12 @@ struct urb
 	struct kref kref;		/* reference count of the URB */
 	spinlock_t lock;		/* lock for the URB */
 	void *hcpriv;			/* private data for host controller */
-	struct list_head urb_list;	/* list pointer to all active urbs */
 	int bandwidth;			/* bandwidth for INT/ISO request */
 	atomic_t use_count;		/* concurrent submissions counter */
 	u8 reject;			/* submissions will fail */
 
 	/* public, documented fields in the urb that can be used by drivers */
+	struct list_head urb_list;	/* list head for use by the urb owner */
 	struct usb_device *dev; 	/* (in) pointer to associated device */
 	unsigned int pipe;		/* (in) pipe information */
 	int status;			/* (return) non-ISO status */