On Wed, 2016-12-21 at 12:54 +0100, Hans de Goede wrote: > Hi, > > On 21-12-16 12:42, Oliver Neukum wrote: > > On Wed, 2016-12-21 at 17:09 +0530, George Cherian wrote: > >> Hi Oliver, > >> > >> I was working with this JMicron device and using the uas driver. > >> I am seeing the following 2 issues. > >> > >> 1) On connect I see the following messages. > > > > Thanks. Do you want to submit it to Greg? > > The patch is fine. > > > >> 2) On disconnect I am seeing the following issue > >> > >> scsi host4: uas_post_reset: alloc streams error -19 after reset > >> sd 4:0:0:0: [sdb] Synchronizing SCSI cache > >> > >> This is more fatal because after these messages the USB port becomes > >> unusable. Even an lsusb invocation hangs for ever. > > > > Ouch. That points to a logic error. We should not reset if > > a device is gone. > > Ah good point, so instead of just seeing a disconnect, something > is triggering a reset, and then we try to alloc stream on the > disconnected usb port and that apparently makes the xhci controller > quite unhappy. It is problematic because there is a window we cannot avoid. This needs a full dmesg to say anything more about it. Regards Oliver -- 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
