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-rw-r--r--Documentation/usb/anchors.txt17
1 files changed, 17 insertions, 0 deletions
diff --git a/Documentation/usb/anchors.txt b/Documentation/usb/anchors.txt
index 5e6b64c20d25..6f24f566955a 100644
--- a/Documentation/usb/anchors.txt
+++ b/Documentation/usb/anchors.txt
@@ -52,6 +52,11 @@ Therefore no guarantee is made that the URBs have been unlinked when
52the call returns. They may be unlinked later but will be unlinked in 52the call returns. They may be unlinked later but will be unlinked in
53finite time. 53finite time.
54 54
55usb_scuttle_anchored_urbs()
56---------------------------
57
58All URBs of an anchor are unanchored en masse.
59
55usb_wait_anchor_empty_timeout() 60usb_wait_anchor_empty_timeout()
56------------------------------- 61-------------------------------
57 62
@@ -59,4 +64,16 @@ This function waits for all URBs associated with an anchor to finish
59or a timeout, whichever comes first. Its return value will tell you 64or a timeout, whichever comes first. Its return value will tell you
60whether the timeout was reached. 65whether the timeout was reached.
61 66
67usb_anchor_empty()
68------------------
69
70Returns true if no URBs are associated with an anchor. Locking
71is the caller's responsibility.
72
73usb_get_from_anchor()
74---------------------
62 75
76Returns the oldest anchored URB of an anchor. The URB is unanchored
77and returned with a reference. As you may mix URBs to several
78destinations in one anchor you have no guarantee the chronologically
79first submitted URB is returned. \ No newline at end of file