> -----Original Message----- > From: linux-usb-owner@xxxxxxxxxxxxxxx [mailto:linux-usb- > owner@xxxxxxxxxxxxxxx] On Behalf Of Sarah Sharp > Sent: Friday, July 27, 2012 4:22 AM > To: Matthew Hall > Cc: linux-usb@xxxxxxxxxxxxxxx; gem@xxxxxxxxxx > Subject: Re: the dreaded "needs XHCI_TRUST_TX_LENGTH quirk" returns > > On Thu, Jul 26, 2012 at 07:16:38AM -0700, Sarah Sharp wrote: > > On Wed, Jul 25, 2012 at 10:24:26PM -0700, Matthew Hall wrote: > > > On Wed, Jul 25, 2012 at 10:46:37AM -0700, Sarah Sharp wrote: > > > I think I'm in the same state as Gary only different. ;) I am > > > getting weird behavior with the quirk patch. The device popped up > > > for about half a minute, then went haywire and disappeared after the > > > exfat FUSE FS tried to mount it and begin reading the volume > successfully for a short moment. > > > > I think now that your host is working, you're running into a separate > > bug that several other people have discovered. Your mass storage > > device stalls a lot of SCSI commands (which is fine), and that > > eventually hits a bug when the stall happens just before the end of a > > transfer ring segment boundary. > > > > The bug causes this message to appear: > > ERROR Transfer event TRB DMA ptr not part of current TD > > Ok, I think I have the root cause of this message, and it's a nasty little > bug. Can you apply the attached patch (instead of the previous debug patch) > and test? I think your disk will work once it's applied, but please double > check that you don't see any more of that ERROR message. > I have one question about the patch - why does the issue not occur without ring expansion patches? If there is only one ring segment and the dequeue pointer is pointed to the Link TRB, the inc_deq() will also move dequeue pointer out of the segment, and it will not even wrap back, which is worse. Thanks, Andiry -- 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
