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USB: Documentation/usb/anchors.txt #2

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This adds Documentation for the extensions of the anchor API.

Signed-off-by: Oliver Neukum <oneukum@suse.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
This commit is contained in:
Oliver Neukum 2008-09-02 14:16:11 +02:00 committed by Greg Kroah-Hartman
parent 4a511bc3f5
commit d1b1944085
1 changed files with 17 additions and 0 deletions
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17
Documentation/usb/anchors.txt
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@ -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.