linux-kernel - Re: [PATCH] pci: Fix unaligned access testing AF transaction pending

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Date:	Fri, 13 Jun 2014 09:33:37 +1000
From:	Gavin Shan <gwshan@...ux.vnet.ibm.com>
To:	Alex Williamson <alex.williamson@...hat.com>
Cc:	linux-pci@...r.kernel.org, bhelgaas@...gle.com,
	ben@...adent.org.uk, gwshan@...ux.vnet.ibm.com,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] pci: Fix unaligned access testing AF transaction pending

On Thu, Jun 12, 2014 at 09:28:07AM -0600, Alex Williamson wrote:
>pci_wait_for_pending() uses word access, so we shouldn't be passing
>an offset that is only byte aligned.  Use the control register offset
>instead, shifting the mask to match.
>
>Signed-off-by: Alex Williamson <alex.williamson@...hat.com>
>Reported-by: Ben Hutchings <ben@...adent.org.uk>
>Cc: stable@...r.kernel.org

Acked-by: Gavin Shan <gwshan@...ux.vnet.ibm.com>

>---
> drivers/pci/pci.c |    9 +++++++--
> 1 file changed, 7 insertions(+), 2 deletions(-)
>
>diff --git a/drivers/pci/pci.c b/drivers/pci/pci.c
>index 759475e..81012ec 100644
>--- a/drivers/pci/pci.c
>+++ b/drivers/pci/pci.c
>@@ -3109,8 +3109,13 @@ static int pci_af_flr(struct pci_dev *dev, int probe)
> 	if (probe)
> 		return 0;
>
>-	/* Wait for Transaction Pending bit clean */
>-	if (pci_wait_for_pending(dev, pos + PCI_AF_STATUS, PCI_AF_STATUS_TP))
>+	/*
>+	 * Wait for Transaction Pending bit to clear.  A word-aligned test
>+	 * is used, so we use the conrol offset rather than status and shift
>+	 * the test bit to match.
>+	 */
>+	if (pci_wait_for_pending(dev, pos + PCI_AF_CTRL,
>+				 PCI_AF_STATUS_TP << 8))
> 		goto clear;
>
> 	dev_err(&dev->dev, "transaction is not cleared; "
>

Thanks,
Gavin

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