From: Larry Finger <Larry.Finger@lwfinger.net>
To: Sarah Sharp <sarah.a.sharp@linux.intel.com>
Cc: jerome huang <jerome.syno@gmail.com>,
"Xu, Andiry" <Andiry.Xu@amd.com>,
linux-usb@vger.kernel.org, linux-wireless@vger.kernel.org
Subject: Re: rt8192cu on USB3
Date: Thu, 22 Mar 2012 21:24:31 -0500 [thread overview]
Message-ID: <4F6BDEDF.2020907@lwfinger.net> (raw)
In-Reply-To: <20120322223107.GA8877@xanatos>
On 03/22/2012 05:31 PM, Sarah Sharp wrote:
> Larry, if the driver doesn't cancel an URB that the device doesn't
> respond to, then it will just be left on the endpoint ring. If the
> driver then tries to queue new transfers to that same endpoint, but the
> device keeps NAKing the uncancelled transfer, then the endpoint ring
> would fill up with unanswered transfers.
>
> Perhaps some userspace or kernel portion is forgetting to cancel URBs
> before moving onto the next thing? You said you moved to asynchronous
> transfers, so maybe the problem lies there?
The writes have always been asynchronous and reads are synchronous. The only
change was to convert the firmware uploading writes from 32-bits at a time into
block writes of 1000+ 32-bit words.
Would xhci be worse that ohci or ehci in terms of the device not responding to
URBs? We only see problems with USB3.0 hubs, never with 2.0 or 1.1.
I am looking into changing the writes to be synchronous. That should clear up
any problems.
Larry
next prev parent reply other threads:[~2012-03-23 2:24 UTC|newest]
Thread overview: 21+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-03-08 2:03 rt8192cu on USB3 jerome huang
2012-03-08 2:16 ` jerome huang
2012-03-08 2:35 ` Larry Finger
2012-03-08 6:35 ` jerome huang
2012-03-08 7:06 ` Andiry Xu
2012-03-08 7:11 ` Andiry Xu
[not found] ` <2A76B9D36150BE4293842BC2FE8FF165016A31@SCYBEXDAG04.amd.com>
2012-03-08 10:32 ` jerome huang
2012-03-08 11:26 ` jerome huang
2012-03-08 17:56 ` Larry Finger
2012-03-09 3:28 ` jerome huang
2012-03-09 3:59 ` Larry Finger
2012-03-09 7:39 ` jerome huang
2012-03-09 15:04 ` Larry Finger
2012-03-09 16:02 ` jerome huang
2012-03-22 22:31 ` Sarah Sharp
2012-03-23 2:24 ` Larry Finger [this message]
2012-03-23 20:34 ` Sarah Sharp
2012-03-24 2:16 ` Richard Farina
2012-03-24 4:59 ` Larry Finger
2012-04-05 22:49 ` Sarah Sharp
2012-03-24 4:55 ` Larry Finger
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