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Commit d1b19440 authored by Oliver Neukum's avatar Oliver Neukum Committed by Greg Kroah-Hartman
Browse files

USB: Documentation/usb/anchors.txt #2 



This adds Documentation for the extensions of the anchor API.

Signed-off-by: default avatarOliver Neukum <oneukum@suse.de>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@suse.de>
parent 4a511bc3

Documentation/usb/anchors.txt

+17 −0
Original line number Original line Diff line number Diff line
@@ -52,6 +52,11 @@ Therefore no guarantee is made that the URBs have been unlinked when 
the call returns. They may be unlinked later but will be unlinked in

the call returns. They may be unlinked later but will be unlinked in

finite time.

finite time.





usb_scuttle_anchored_urbs()

---------------------------



All URBs of an anchor are unanchored en masse.



usb_wait_anchor_empty_timeout()

usb_wait_anchor_empty_timeout()

-------------------------------

-------------------------------
@@ -59,4 +64,16 @@ This function waits for all URBs associated with an anchor to finish 
or a timeout, whichever comes first. Its return value will tell you

or a timeout, whichever comes first. Its return value will tell you

whether the timeout was reached.

whether the timeout was reached.





usb_anchor_empty()

------------------



Returns true if no URBs are associated with an anchor. Locking

is the caller's responsibility.



usb_get_from_anchor()

---------------------





Returns the oldest anchored URB of an anchor. The URB is unanchored

and returned with a reference. As you may mix URBs to several

destinations in one anchor you have no guarantee the chronologically

first submitted URB is returned.
 
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