[RFC PATCH] nvme: avoid race-conditions when enabling devices

[Marta Rybczynska]

> On Wed, Mar 21, 2018 at 05:10:56PM +0100, Marta Rybczynska wrote:
>> 
>> The problem may happen also with other device doing its probe and
>> nvme running its workqueue (and we probably have seen it in practice
>> too). We were thinking about a lock in the pci generic code too,
>> that's why I've put the linux-pci@ list in copy.
> 
> Yes, this is a generic problem in the PCI core.  We've tried to fix it
> in the past but haven't figured it out yet.
> 
> See 40f11adc7cd9 ("PCI: Avoid race while enabling upstream bridges")
> and 0f50a49e3008 ("Revert "PCI: Avoid race while enabling upstream
> bridges"").
> 
> It's not trivial, but if you figure out a good way to fix this, I'd be
> thrilled.
> 

Bjorn, Srinath, are you aware of anyone working on an updated fix
for this one?

Marta