On Fri, 06 Oct 2006 13:05:18 -0600
Matthew Wilcox <[EMAIL PROTECTED]> wrote:
> Since some devices may not implement the MWI bit, we should check that
> the write did set it and return an error if it didn't.
>
> Signed-off-by: Matthew Wilcox <[EMAIL PROTECTED]>
>
> diff --git a/drivers/pci/pci.c b/drivers/pci/pci.c
> index a544997..3d041f4 100644
> --- a/drivers/pci/pci.c
> +++ b/drivers/pci/pci.c
> @@ -900,13 +900,17 @@ #endif
> return rc;
>
> pci_read_config_word(dev, PCI_COMMAND, &cmd);
> - if (! (cmd & PCI_COMMAND_INVALIDATE)) {
> - pr_debug("PCI: Enabling Mem-Wr-Inval for device %s\n",
> pci_name(dev));
> - cmd |= PCI_COMMAND_INVALIDATE;
> - pci_write_config_word(dev, PCI_COMMAND, cmd);
> - }
> -
> - return 0;
> + if (cmd & PCI_COMMAND_INVALIDATE)
> + return 0;
> +
> + pr_debug("PCI: Enabling Mem-Wr-Inval for device %s\n", pci_name(dev));
> + cmd |= PCI_COMMAND_INVALIDATE;
> + pci_write_config_word(dev, PCI_COMMAND, cmd);
> +
> + /* read result from hardware (in case bit refused to enable) */
> + pci_read_config_word(dev, PCI_COMMAND, &cmd);
> +
> + return (cmd & PCI_COMMAND_INVALIDATE) ? 0 : -EINVAL;
> }
>
> /**
Bisection shows that this patch
(pci-check-that-mwi-bit-really-did-get-set.patch in Greg's PCI tree) breaks
suspend-to-disk on my Vaio. It writes the suspend image and gets to the
point where it's supposed to power down, but doesn't.
After a manual power-cycle it successfully resumes from disk, but
networking (at least) is dead.
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