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[83.28.44.95]) by smtp.gmail.com with ESMTPSA id 5b1f17b1804b1-49e2212193esm29745215e9.1.2026.09.10.04.32.06 (version=TLS1_2 cipher=AES128-SHA bits=128/128); Thu, 10 Sep 2026 04:32:07 -0700 (PDT) Date: Thu, 10 Sep 2026 13:32:04 +0200 From: Michal Pecio To: wakasio Cc: Mathias Nyman , Greg Kroah-Hartman , linux-usb@vger.kernel.org, linux-kernel@vger.kernel.org Subject: Re: xhci_hcd / ASMedia ASM4242: Bulk-OUT -EPROTO with Logitec 0789:0308 during DVD+RW recording Message-ID: <20260910133204.3157f83b.michal.pecio@gmail.com> In-Reply-To: <20260910110453.1528072-1-scarabeeta@gmail.com> References: <20260908131046.1fa7034f.michal.pecio@gmail.com> <20260910110453.1528072-1-scarabeeta@gmail.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit On Thu, 10 Sep 2026 20:04:53 +0900, wakasio wrote: > I looked for the offending TRB in the dump, attached is the full log > (dyndbg_capture4_trb_dump.log, 1061 lines). The attachment seems to be missing. > The 11 xhci_dbg lines all say "Transfer error for slot 1 ep 3", same > address ffffd140425178e0, resid 23552, each followed by "Soft-reset ep > 3". After the 11th one the driver printed "event ring:" and dumped it, > then "endpoint ring:" and dumped that too. > > I searched the endpoint ring dump for the DMA address that the event > ring entries point to. I could not find it. The endpoint ring dump > covers two segments, 0xfffc00000 to 0xfffc00ff0 and 0xfffbf0000 to > 0xfffbf0ff0, linked back to each other with a Link TRB. The address in > question, 0xfffbf8e0, falls between these two ranges, not inside > either one. Not sure what happened, I'd like to see the full dump. It's possible that my patch is wrong and logged some addresses incorrectly, but I think it should have logged the correct ring and the events must have matched the ring, or otherwise other errors would be logged. > I also noticed the event ring entries pointing to that address are all > labeled "ep 4", not "ep 3". Yes, 4 is the number used by xHCI, 3 is a driver-internal equivalent. Regards, Michal