Hi Greg, On 09/08/2016 02:38 PM, Greg KH wrote: > On Thu, Sep 08, 2016 at 08:41:02AM +0800, Lu Baolu wrote: >> xhci_setup_device() should return failure with correct error number >> when xhci host has died, removed or halted. >> >> Cc: sta...@vger.kernel.org # 4.3+ > Why is this a stable kernel issue? What bug does it fix that affects > users?
During usb device enumeration, if xhci host is not accessible (died, removed or halted), the hc_driver->address_device() should return a corresponding error code to usb core. But current xhci driver just returns success. This will mislead usb core to continue enumeration: reading device descriptor, which will result in failure, and users will get a misleading message like "device descriptor read/8, error -110". Best regards, Lu Baolu
