random failures with Intel devices starting from kernel 3.18

random failures with Intel devices starting from kernel 3.18

[Emmanuel Grumbach]

Hi,

I recently got quite a few reports about failures of the Intel wireless devices.
I looked at the logs and it turns out that we can't access our device
anymore. We had bad issues around this and I fixed them in the iwlwifi
driver in the end. What makes me feels that I need to add PCI folks is
that I can feel that we have a regression in 3.18 (based on the number
of reports) and we didn't change much there that could cause such a
bug.

Also, very surprisingly, I asked someone to disable ASPM as a boot
parameter and that didn't actually disable it. You can find more
details here [1].

What I see in the logs is that iwlwifi is trying to access the mapped
memory of the device (I may have a bad terminology, but it is BAR +
0x24 - let me know if the term is not the right one), and we get
0xffffffff...

Any thoughts?

Thanks!

[1] https://bugzilla.kernel.org/show_bug.cgi?id=91171

Emmanuel Grumbach
egrumbach@gmail.com