[haiku-development] Re: Haiku USB: actual_length returned from send_request() is differ than amount of transferred data.
- From: "Michael Lotz" <mmlr@xxxxxxxx>
- To: haiku-development@xxxxxxxxxxxxx
- Date: Sat, 19 Jul 2008 18:04:57 +0200
On Fri, 18 Jul 2008 22:51:05 +0200, Siarzhuk Zharski wrote
> Hi!
>
> During work on some USB2Ethernet BeOS/Haiku driver I have observed
> that send_request call behaves a bit differently on Haiku than on
>
> ...
>
> The "write register value" call on Haiku returns 10 as actual_length
> of transferred data. On R5 this code returns only 2. I have quickly
> browse through Haiku USB implementation and found that this
> parameter is set by corresponding transfer callback to size of _all_
> data transferred during this send_request call. I thought that usual
> user want only transferred data size here. Am I right? :-)
Yes, that's right, fixed in r26508. It should have happened only for the
outgoing requests, not for the incoming ones, as another codepath is taken
there.
> By the way, the driver code is currently available at
> http://sis4be.cvs.sourceforge.net/sis4be/usb_asix/. It inherits
> skeleton functionality from Haiku's usb_ecm one and support ASIX
> AX88172/AX88772/AX88178-based USB2Ethernet adapters. It is also
> known as "if_axe" on FreeBSD and as "asix" on Linux. May it be
> useful to beautify Haiku's Tree too? ;-)
Nice work! I would say there's no reason not to include it, so from my
perspective feel free to add it.
Regards
Michael
Other related posts:
