On Thu, 17 Jul 2014, Gavin Guo wrote: > When using USB 3.0 pen drive with the [AMD] FCH USB XHCI Controller > [1022:7814], the second hotplugging will experience the USB 3.0 pen > drive is recognized as high-speed device. After bisecting the kernel, > I found the commit number 41e7e056cdc662f704fa9262e5c6e213b4ab45dd > (USB: Allow USB 3.0 ports to be disabled.) causes the bug. After doing > some experiments, the bug can be fixed by avoiding executing the function > hub_usb3_port_disable(). Because the port status with [AMD] FCH USB > XHCI Controlleris [1022:7814] is already in RxDetect > (I tried printing out the port status before setting to Disabled state), > it's reasonable to check the port status before really executing > hub_usb3_port_disable(). > > Fixes: 41e7e056cdc6 (USB: Allow USB 3.0 ports to be disabled.) > Signed-off-by: Gavin Guo <gavin.guo@xxxxxxxxxxxxx> > Signed-off-by: Alan Stern <stern@xxxxxxxxxxxxxxxxxxx> I did not give you permission to add my Signed-off-by: line to this patch. It wouldn't make any sense anyway, because I haven't merged the patch. However, you can add Acked-by: Alan Stern <stern@xxxxxxxxxxxxxxxxxxx> 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
