On 07/15/2015 01:28 PM, Yinghai Lu wrote: > On Wed, Jul 15, 2015 at 6:52 AM, Timothy Pearson > <tpearson@xxxxxxxxxxxxxxxxxxxxxxxx> wrote: >>> I have just kept the same description provide by Timothy in his >>> initial patch. >>> >>> But I observe that their may be chance of getting "unable to handle >>> kernel NULL pointer dereference" kernel panic if no Memory Resource >>> available in the PCI subsystem. So agreed to the Timothy proposal of >>> aborting the driver initialization if it doesn't detect any Memory >>> resource instead of whole system get into panic state. >>> >> On some systems Linux is unable / unwilling to assign a BAR if the BIOS >> does not assign one at startup. I didn't look into the Linux allocator >> side of things in much detail, but it is quite possible that Linux is >> unaware the device only has partial resources assigned. >> > > Would be great if you can post boot log so we can figure about why those > BARs are not assigned. > > Yinghai Unfortunately the systems exhibiting the issue were upgraded to a later BIOS that does not have this problem; it might be possible to set up a test system in the future but that probably won't happen for some time. -- Timothy Pearson Raptor Engineering +1 (415) 727-8645 http://www.raptorengineeringinc.com -- To unsubscribe from this list: send the line "unsubscribe linux-pci" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
