I upgraded from 2.6.17.7 to 2.6.18 today, and in dmesg I have 5 of these
messages in a row:
Kernel unaligned access at TPC[100be8c8] ehci_hub_control+0x350/0x680 [ehci_hcd]
This message wasn't there before... I suppose it is pretty harmless as
the kernel is supposed to handle unaligned accesses (right?) but this is
the first time it's happened.
According to gdb (my first time using it...),
drivers/usb/host/ehci-hub.c:280 is to blame:
(gdb) list *ehci_hub_control+0x350
0x8d0 is in ehci_hub_control (drivers/usb/host/ehci-hub.c:280).
275 struct usb_hub_descriptor *desc
276 ) {
277 int ports = HCS_N_PORTS (ehci->hcs_params);
278 u16 temp;
279
280 desc->bDescriptorType = 0x29;
281 desc->bPwrOn2PwrGood = 10; /* ehci 1.0, 2.3.9 says 20ms max */
282 desc->bHubContrCurrent = 0;
283
284 desc->bNbrPorts = ports;
System is a Sun U80 4x450 with 2.5G and a USB2 PCI card. GCC for the
kernel is 4.1.1 (with gentoo patchset). The only USB2 device is an
external Sony dual layer DVD writer.
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