Eric Lee / linux-smarc-t335x-v3.2

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Commit d1b1944085ab2345fae4a5fbb614f1a4d0732d3e

Authored by Oliver Neukum
Committed by Greg Kroah-Hartman
1 parent 4a511bc3f5
Exists in master and in 4 other branches v3.2_AM335xPSP_04.06.00.11, v3.2_NEWT335xPSP_04.06.00.11, v3.2_SBC_SMARTMEN, v3.2_SMARCT335xPSP_04.06.00.11

USB: Documentation/usb/anchors.txt #2 

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>

Showing 1 changed file with 17 additions and 0 deletions Side-by-side Diff

Documentation/usb/anchors.txt
Diff comments   View file @ d1b1944
... ... @@ -52,10 +52,29 @@
52 52 the call returns. They may be unlinked later but will be unlinked in
53 53 finite time.
54 54  
  55 +usb_scuttle_anchored_urbs()
  56 +---------------------------
  57 +
  58 +All URBs of an anchor are unanchored en masse.
  59 +
55 60 usb_wait_anchor_empty_timeout()
56 61 -------------------------------
57 62  
58 63 This function waits for all URBs associated with an anchor to finish
59 64 or a timeout, whichever comes first. Its return value will tell you
60 65 whether the timeout was reached.
  66 +
  67 +usb_anchor_empty()
  68 +------------------
  69 +
  70 +Returns true if no URBs are associated with an anchor. Locking
  71 +is the caller's responsibility.
  72 +
  73 +usb_get_from_anchor()
  74 +---------------------
  75 +
  76 +Returns the oldest anchored URB of an anchor. The URB is unanchored
  77 +and returned with a reference. As you may mix URBs to several
  78 +destinations in one anchor you have no guarantee the chronologically
  79 +first submitted URB is returned.