On 3/17/2021 4:02 PM, Kuppuswamy, Sathyanarayanan wrote: > My point is, there is no race in OS handlers (pciehp_ist() vs > pcie_do_recovery()) > However, Sinan wrote in >> 2018 that one of the issues with hotplug versus DPC is that pciehp >> may turn off slot power and thereby foil DPC recovery. (Power off = >> cold reset, whereas DPC recovery = warm reset.) This can occur >> as well if DPC is handled by firmware.
It has been a while... If I remember correctly, there is no race condition if the platform handles DPC and HP interrupts on the same MSI vector. If HP and DPC interrupts are handled as MSI-x interrupts, these can fire out of order and can cause problems for each one. I hope it helps.
