On Wed, May 16, 2018 at 06:44:22PM -0400, Sinan Kaya wrote: > On 5/16/2018 5:33 PM, Alexandru Gagniuc wrote: > > AER status bits are sticky, and they survive system resets. Downstream > > devices are usually taken care of after re-enumerating the downstream > > busses, as the AER bits are cleared during probe(). > > > > However, nothing clears the bits of the port which contained the > > error. These sticky bits may leave some BIOSes to think that something > > bad happened, and print ominous messages on next boot. To prevent this, > > tidy up the AER status bits before releasing containment. > > > > Signed-off-by: Alexandru Gagniuc <[email protected]> > > --- > > drivers/pci/pcie/dpc.c | 4 ++++ > > 1 file changed, 4 insertions(+) > > > > diff --git a/drivers/pci/pcie/dpc.c b/drivers/pci/pcie/dpc.c > > index 8c57d607e603..bf82d6936556 100644 > > --- a/drivers/pci/pcie/dpc.c > > +++ b/drivers/pci/pcie/dpc.c > > @@ -112,6 +112,10 @@ static void dpc_work(struct work_struct *work) > > dpc->rp_pio_status = 0; > > } > > > > + /* DPC event made a mess of our AER status bits. Clean them up. */ > > + pci_cleanup_aer_error_status_regs(pdev); > > + /* TODO: Should we also use aer_print_error to log the event? */ > > + > > pci_write_config_word(pdev, cap + PCI_EXP_DPC_STATUS, > > PCI_EXP_DPC_STATUS_TRIGGER | PCI_EXP_DPC_STATUS_INTERRUPT); > > > > > > I think Keith has a patch to fix this. It was under review at some point.
Right, I do intend to following up on this, but I've had some trouble finding time the last few weeks. Sorry about that, things will clear up for me shortly.
