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PCI: Fix unaligned accesses in VC code 

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.

Fixes: 5f8fc43217 ("PCI: Include pci/pcie/Kconfig directly from pci/Kconfig")
Reported-by: Meelis Roos <mroos@linux.ee>
Reported-by: Anatoly Pugachev <matorola@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
CC: stable@vger.kernel.org	# v4.6+
This commit is contained in:
David Miller 2016-06-18 23:52:25 -07:00 committed by Bjorn Helgaas
parent af8c34ce6a
commit ef0dab4aae
1 changed files with 2 additions and 2 deletions
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4
drivers/pci/vc.c
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@ -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