Am Donnerstag, den 16.01.2020, 06:35 +0100 schrieb Lukas Wunner: > [cc += Stuart] > > On Wed, Jan 15, 2020 at 12:24:29PM +0100, Lukas Wunner wrote: > > On Wed, Jan 15, 2020 at 11:26:26AM +0100, Oliver Neukum wrote: > > > I got a bug report about some systems generating an NMI and > > > subsequently crashing bisected down to 80696f991424d. > > > Apparently these systems do not react well to __pciehp_enable_slot > > > while no card is present. Restoring the check to __pciehp_enable_slot() > > > removed in 80696f991424d makes the current kernels work. > > > > That's odd, these systems must be setting the Data Link Layer Link Active > > bit in the Link Status Register even though no card is present. > > Recent PCIe versions allow turning off in-band presence detect, in which > case the DLLLA bit can be set even though Presence Detect is not set. > You may be dealing with one of those systems but without full dmesg > and lspci output this is just an educated guess. > > A series was submitted by Dell last year to support disabling in-band > presence detect, but it hasn't been merged yet by Bjorn: > > https://lore.kernel.org/linux-pci/20191025190047.38130-1-stuart.w.hayes@xxxxxxxxx/ > > You may want to try if that series helps. Hi, it has been tested and it does the job. May I ask whether you could ack it or propose necessary changes, so that we can proceed? Regards Oliver
