On 03/23/12 16:34, Sarah Sharp wrote: > On Thu, Mar 22, 2012 at 09:24:31PM -0500, Larry Finger wrote: >> 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. > Yeah, that's going to cause the out-of-room warning under xHCI. That > should be fixed in the 3.4-rc1 kernel though. Given that I can replicate this issue using several different drivers, should I test using 3.4_rc1 kernel to see if the usb is fixed or using compat-wireless based on 3.4_rc1 to see if the drivers are fixed? Or both? Thanks, Rick > >> 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. > That's because EHCI handles arbitrarily large transfers, and xHCI didn't > until now. > >> I am looking into changing the writes to be synchronous. That should >> clear up any problems. > Yeah, your problem probably was in the bulk large transfer, not the > unfinished canceled URBs. I would suggest getting your reporters to > just try 3.4-rc1 and see if it helps before doing too much work to debug > this. > > Sarah Sharp > -- > To unsubscribe from this list: send the line "unsubscribe linux-wireless" in > the body of a message to majordomo@xxxxxxxxxxxxxxx > More majordomo info at http://vger.kernel.org/majordomo-info.html > -- To unsubscribe from this list: send the line "unsubscribe linux-usb" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
