On Mon, Mar 12, 2018 at 01:41:07PM -0400, Sinan Kaya wrote: > I was just writing a reply to you. You acted first :) > > On 3/12/2018 1:33 PM, Keith Busch wrote: > >>> After releasing a slot from DPC, the link is allowed to retrain. If > >>> there > >>> is a working device on the other side, a link up event occurs. That > >>> event is handled by the pciehp driver, and that schedules enumeration > >>> no matter what you do to the DPC driver. > >> yes, that is what i current, but this patch-set makes DPC aware of error > >> handling driver callbacks. > > I've been questioning the utility of doing that since the very first > > version of this patch set. > > > > I think we should all agree that shutting down the device drivers with active > work is not safe. There could be outstanding work that the endpoint driver > needs to take care of. > > That was the motivation for this change so that we give endpoint drivers an > error callback when something goes wrong. > > The rest is implementation detail that we can all figure out. I'm not sure if I agree here. All Linux device drivers are supposed to cope with sudden/unexpected loss of communication at any time. This includes cleaning up appropriately when requested to unbind from an inaccessible device with active outstanding work.
