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Date: Sat, 6 Sep 2008 21:32:56 -0700 From: David Brownell <david-b@...bell.net> To: Alan Stern <stern@...land.harvard.edu> Cc: sangsu <sangsu@...il.com>, linux-usb@...r.kernel.org, linux-kernel@...r.kernel.org, gregkh@...e.de Subject: Re: [PATCH] USB: g_file_storage: fix handling zero-length packet On Saturday 06 September 2008, Alan Stern wrote: > Secondly, the patch is not needed. g_file_storage doesn't have to > check whether the data size is a multiple of MaxPacketSize because the > device controller driver already is supposed to make that check. Exactly. The only fuzziness here is what to do if the host misbehaves and sends another IN packet when all its data has been sent, instead of the OUT/STATUS packet. (Host error...) Most peripheral controller hardware is well enough designed that it can detect this and send a zero length packet rather than STALL the transfer. It's polite to do so, because that host bug isn't exactly unknown. (Some old versions of Linux did that...) -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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