Hi Sarah and Alan, thank you for your answer. I finally got to look for some current patches and to test them. Confirming that patch 50d0206fcaea3e736f912fd5b00ec6233fb4ce44 applied over linux-3.5.1 fixes my problem and the modem now works fine when attached to USB3 host. Quoting the patch from http://www.spinics.net/lists/stable-commits/msg19131.html below: <quote> Subject: Patch "xhci: Fix bug after deq ptr set to link TRB." has been added to the 3.5-stable tree From: <gregkh@xxxxxxxxxxxxxxxxxxx> Date: Fri, 17 Aug 2012 10:51:27 -0700 Cc: <stable@xxxxxxxxxxxxxxx>, <stable-commits@xxxxxxxxxxxxxxx> Reply-to: linux-kernel@xxxxxxxxxxxxxxx This is a note to let you know that I've just added the patch titled xhci: Fix bug after deq ptr set to link TRB. to the 3.5-stable tree which can be found at: http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary The filename of the patch is: xhci-fix-bug-after-deq-ptr-set-to-link-trb.patch and it can be found in the queue-3.5 subdirectory. If you, or anyone else, feels it should not be added to the stable tree, please let <stable@xxxxxxxxxxxxxxx> know about it. >From 50d0206fcaea3e736f912fd5b00ec6233fb4ce44 Mon Sep 17 00:00:00 2001 From: Sarah Sharp <sarah.a.sharp@xxxxxxxxxxxxxxx> Date: Thu, 26 Jul 2012 12:03:59 -0700 Subject: xhci: Fix bug after deq ptr set to link TRB. From: Sarah Sharp <sarah.a.sharp@xxxxxxxxxxxxxxx> commit 50d0206fcaea3e736f912fd5b00ec6233fb4ce44 upstream. </quote> Thanks, Martin Alan Stern wrote: > On Tue, 14 Aug 2012, Martin Mokrejs wrote: > >> Dear Sarah and Alan, >> would you please help me with fixing the issue of a USB2 modem stick not working via USB3 >> chip from Texas Instruments? This is Dell Vostro 3550. It never worked before and the kernel >> is now plain 3.5.0. Attached are two usbmon traces and corresponding messages snippets. >> In the "broken" mode pppd fires up the interface and sends and receives 7 packets but is stuck >> then. > > This is entirely Sarah's ballpark; I can't be of any help except to > point out that the error occurs at this point in the USB3 log: > > Aug 14 09:10:31 vostro pppd[30105]: Script /etc/ppp/ip-up finished (pid 30779), status = 0x0 > Aug 14 09:10:35 vostro kernel: [ 1168.524795] xhci_hcd 0000:0b:00.0: ERROR Transfer event TRB DMA ptr not part of current TD > > You can try looking through the mailing list archives; there may > already be some patches to fix this problem. > > Alan Stern > > -- 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
