[Thanks Maxime for pointing me to this discussion, +RMK] Hi Hans,
On 26/06/16 17:00, Hans de Goede wrote: > Hi, > > I've just spend most of my Sunday debugging a problem > where Allwinner ARM SoC based boards will not shutdown when > using a Fedora 24 userland, where as the exact same > kernel works fine with Fedora 22. > > It turns out that irq-balanced is to blame. In Fedora 24 > it pins the i2c controller, which talks to the pmic > which is needed for poweroff to cpu-id 1: > > [root@localhost ~]# cat /proc/irq/49/smp_affinity > 2 > > Where as the reboot_cpu is cpu-id 0 and with > cpu 1 disabled at poweroff time, the i2c transfer > never gets past its first step leading to an i2c > driver timeout + kernel panic due to machine_power_off() > returning. > > As a workaround I can stop irq-balanced and do: > > echo 3 > /proc/irq/49/smp_affinity > > Before doing poweroff and then everything works as > expected again. > > Now the question is how to fix this? [...] I'm wondering if that's not an effect of this patch: https://lkml.org/lkml/2015/9/24/138 missing on the ARM side (the corresponding arm64 patch is 217d453d473c). Otherwise, can you instrument the GIC set_affinity method and find out if we're even trying to move this IRQ away from the CPU that is being torn down? Thanks, M. -- Jazz is not dead. It just smells funny...
