Ben Hutchings <bhutchings@xxxxxxxxxxxxxx> writes: > On Sat, 2014-01-11 at 08:56 +1300, Thomas Kear wrote: >> USB3 gigabit ethernet adapters with the ASIX AX88179 chipset (LevelOne >> USB0401-V3, Plugable USB3-E1000, SIIG JU-NE0211-S1 and others) are >> experiencing kernel panics in usb_hcd_map_urb_for_dma since 3.12. > [...] >> So far as I can tell, the driver is unaffected as late as 3.11.6, but >> problematic as of 3.12 (and still affected in 3.13-rc5). The history >> of drivers/net/usb/ax88179_178a.c for this time period yields this >> patch, which at least in my somewhat limited understanding appeared a >> likely candidate. I've reverted this on my system - against several >> linux-next builds from the last 3-4 weeks - and have had no issues >> with this network controller since. >> >> commit 3804fad45411b48233b48003e33a78f290d227c8 >> Author: Ming Lei <ming.lei@xxxxxxxxxxxxx> >> Date: Thu Aug 8 21:48:25 2013 +0800 >> >> USBNET: ax88179_178a: enable tso if usb host supports sg dma > > Enabling SG DMA here has unfortunately caused a number of regressions as > the XHCI (USB 3 controller) hardware is a bit inflexible and the driver > wasn't quite ready to handle the SG lists generated for net devices. > > I don't think I've seen this particular symptom though, and it might > indicate a bug in usbnet. Yes, I believe this code in usbnet is still somewhat unmature and not much tested. Unfortunately I don't have any PC with xhci, so I can't do much about that. But looking at the code I think I found and obvious miss in the SG list initialisation. I'll post a proposed fix for that. Would be good if someone was able to test it. Bjørn -- To unsubscribe from this list: send the line "unsubscribe linux-usb" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
