* [PATCH] pci: Fix unaligned access testing AF transaction pending
@ 2014-06-12 15:28 Alex Williamson
2014-06-12 23:33 ` Gavin Shan
2014-06-17 21:47 ` Bjorn Helgaas
0 siblings, 2 replies; 3+ messages in thread
From: Alex Williamson @ 2014-06-12 15:28 UTC (permalink / raw)
To: linux-pci; +Cc: bhelgaas, ben, gwshan, linux-kernel
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@redhat.com>
Reported-by: Ben Hutchings <ben@decadent.org.uk>
Cc: stable@vger.kernel.org
---
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; "
^ permalink raw reply related [flat|nested] 3+ messages in thread
* Re: [PATCH] pci: Fix unaligned access testing AF transaction pending
2014-06-12 15:28 [PATCH] pci: Fix unaligned access testing AF transaction pending Alex Williamson
@ 2014-06-12 23:33 ` Gavin Shan
2014-06-17 21:47 ` Bjorn Helgaas
1 sibling, 0 replies; 3+ messages in thread
From: Gavin Shan @ 2014-06-12 23:33 UTC (permalink / raw)
To: Alex Williamson; +Cc: linux-pci, bhelgaas, ben, gwshan, linux-kernel
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@redhat.com>
>Reported-by: Ben Hutchings <ben@decadent.org.uk>
>Cc: stable@vger.kernel.org
Acked-by: Gavin Shan <gwshan@linux.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
^ permalink raw reply [flat|nested] 3+ messages in thread
* Re: [PATCH] pci: Fix unaligned access testing AF transaction pending
2014-06-12 15:28 [PATCH] pci: Fix unaligned access testing AF transaction pending Alex Williamson
2014-06-12 23:33 ` Gavin Shan
@ 2014-06-17 21:47 ` Bjorn Helgaas
1 sibling, 0 replies; 3+ messages in thread
From: Bjorn Helgaas @ 2014-06-17 21:47 UTC (permalink / raw)
To: Alex Williamson; +Cc: linux-pci, ben, gwshan, linux-kernel
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@redhat.com>
> Reported-by: Ben Hutchings <ben@decadent.org.uk>
> Cc: stable@vger.kernel.org
Applied with Gavin's ack to for-linus for v3.16, thanks!
> ---
> 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; "
>
^ permalink raw reply [flat|nested] 3+ messages in thread
end of thread, other threads:[~2014-06-17 21:47 UTC | newest]
Thread overview: 3+ messages (download: mbox.gz / follow: Atom feed)
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2014-06-12 15:28 [PATCH] pci: Fix unaligned access testing AF transaction pending Alex Williamson
2014-06-12 23:33 ` Gavin Shan
2014-06-17 21:47 ` Bjorn Helgaas
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