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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 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

finite time.



usb_scuttle_anchored_urbs()

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



All URBs of an anchor are unanchored en masse.



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

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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