On Sat, Jun 18, 2016 at 11:52:25PM -0700, David Miller wrote:
>
> The save/restore buffers for VC state is first composed of a 2-byte
> control register, then a bunch of 4-byte words.
>
> This causes unaligned accesses which trap on platform such as sparc.
>
> This is easy to fix by simply moving the buffer pointer forward by 4
> bytes instead of 2 after dealing with the control register. The
> length adjustment needs to be changed likewise as well.
>
> Reported-by: Meelis Roos <mroos@xxxxxxxx>
> Reported-by: Anatoly Pugachev <matorola@xxxxxxxxx>
> Signed-off-by: David S. Miller <davem@xxxxxxxxxxxxx>
Applied to for-linus for v4.7, thanks.
I'm pretty sure this problem was introduced by 5f8fc43217a0 ("PCI:
Include pci/pcie/Kconfig directly from pci/Kconfig"), which appeared
in v4.6. This effectively made PCIe services, including VC, available
on sparc.
I added a stable tag for v4.6.
> diff --git a/drivers/pci/vc.c b/drivers/pci/vc.c
> index dfbab61..1fa3a32 100644
> --- a/drivers/pci/vc.c
> +++ b/drivers/pci/vc.c
> @@ -221,9 +221,9 @@ static int pci_vc_do_save_buffer(struct pci_dev *dev, int pos,
> else
> pci_write_config_word(dev, pos + PCI_VC_PORT_CTRL,
> *(u16 *)buf);
> - buf += 2;
> + buf += 4;
> }
> - len += 2;
> + len += 4;
>
> /*
> * If we have any Low Priority VCs and a VC Arbitration Table Offset
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