[PATCH 2/2] nvme/quirk: Add a delay before checking for adapter readiness

[Keith Busch]

On Tue, Apr 12, 2016 at 02:48:46PM -0500, Murali N Iyer wrote:
> Jeff, David,
> 
> You might not see the issue 100% of the time if you don't activate the
> different slot. Try with any kernel that provides "reset_controller" interface.
> RHEL 7.2, Ubuntu 16.04 etc. does.
> 
> Example: you are running with FW slot #1
> 
> # nvme fw-log /dev/nvme4
> Firmware Log for device:/dev/nvme4
> afi : 0x11
> frs1 : 0x3430315050494d4b (KMIPP104)
> frs2 : 0x3430315050494d4b (KMIPP104)
> frs3 : 0x3430315050494d4b (KMIPP104)
> frs4 : 0x3430315050494d4b (KMIPP104)
> 
> # echo 1 > /sys/class/nvme/nvme4/reset_controller ==.> This might work most of
> the time
> 
> Now, activate slot #4 and then reset_controller
> 
> # nvme fw-activate /dev/nvme4 -a 2 -s 4
> Success activating firmware action:2 slot:4
> 
> # echo 1 > /sys/class/nvme/nvme4/reset_controller ==> This generates EEH

As older kernels did not export the reset_controller interface, unloading
and reloading the driver with modprobe should reproduce the sequence
you're describing. The method is not as convenient, but should be enough
for a 3rd party with the same controller to confirm results.