On Wed, Feb 21, 2018 at 05:20:40PM -0600, Bjorn Helgaas wrote: > On Wed, Feb 21, 2018 at 04:25:08PM +0530, George Cherian wrote: > > I have found another configuration where this fails. > > Following is the configuration > > 1) Connected a PCIe Intel i40 card under the root port. > > 2) unbind the i40 driver and bind with vfio-pci driver. > > 3) Run lspci in a loop. "lspci -s xx:xx.xx -vvv" > > > > I get the same synchronous external abort. > > In this case the vfio-pci driver probe it moves the device (i40) to > > D3hot provided disable_idle_d3 is not set. lspci tries to do > > the config_access which fails with synchronous external abort when > > the root port transitions to D3hot. > > It *looks* like rpm_resume() should resume parent devices, i.e., the > root port, but I don't know that code at all. It does that unless the ignore_children flag is set, which only few drivers do. Sounds to me like another missing pci_config_pm_runtime_get() somewhere but it's hard to tell without a stacktrace. Thanks, Lukas
