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USB: update documentation for URB_ISO_ASAP

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This patch (as1611) updates the USB documentation and kerneldoc to
give a more precise meaning for the URB_ISO_ASAP flag and to explain
more of the details of scheduling for isochronous URBs.

Signed-off-by: Alan Stern <stern@rowland.harvard.edu>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Alan Stern
2012-10-01 10:31:53 -04:00
committed by Greg Kroah-Hartman
parent 7267547992
commit a03bede5c7
3 changed files with 37 additions and 17 deletions
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Documentation/usb/error-codes.txt
+2 -3
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@@ -35,9 +35,8 @@ USB-specific:
d) ISO: number_of_packets is < 0
e) various other cases
-EAGAIN a) specified ISO start frame too early
b) (using ISO-ASAP) too much scheduled for the future
wait some time and try again.
-EXDEV ISO: URB_ISO_ASAP wasn't specified and all the frames
the URB would be scheduled in have already expired.
-EFBIG Host controller driver can't schedule that many ISO frames.