Messages in this thread | | | Date | Thu, 8 Sep 2016 10:58:19 +0200 | From | Greg KH <> | Subject | Re: [PATCH v2 1/1] usb: xhci: fix return value of xhci_setup_device() |
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On Thu, Sep 08, 2016 at 03:29:25PM +0800, Lu Baolu wrote: > 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: stable@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".
Why didn't you include this in the changelog text so that it is obvious why this patch is needed?
Don't just describe what the patch does, we can read C code, describe _why_ it is needed.
thanks,
greg k-h
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