linux-kernel - Re: MSI: Use correct data offset for 32-bit MSI in read_msi

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Message-ID: <m1ir5ocaxr.fsf@ebiederm.dsl.xmission.com>
Date:	Wed, 03 Oct 2007 12:25:36 -0600
From:	ebiederm@...ssion.com (Eric W. Biederman)
To:	Roland Dreier <roland@...italvampire.org>
Cc:	Greg KH <greg@...ah.com>, linux-pci@...ey.karlin.mff.cuni.cz,
	linux-kernel@...r.kernel.org
Subject: Re: MSI: Use correct data offset for 32-bit MSI in read_msi_msg()

Roland Dreier <roland@...italvampire.org> writes:

> While reading the MSI code trying to find a reason why MSI wouldn't
> work for devices that have a 32-bit MSI address capability, I noticed
> that read_msi_msg() seems to read the message data from the wrong
> offset in this case.

Doh!  Sorry about that.

Acked-by: "Eric W. Biederman" <ebiederm@...ssion.com>
> Signed-off-by: Roland Dreier <roland@...italvampire.org>
> ---
> Unfortunately MSI still doesn't seem to work with Intel 945GM
> integrated graphics on my laptop, even with this fix....
>
>  drivers/pci/msi.c |    2 +-
>  1 files changed, 1 insertions(+), 1 deletions(-)
>
> diff --git a/drivers/pci/msi.c b/drivers/pci/msi.c
> index be1df85..87e0161 100644
> --- a/drivers/pci/msi.c
> +++ b/drivers/pci/msi.c
> @@ -132,7 +132,7 @@ void read_msi_msg(unsigned int irq, struct msi_msg *msg)
>  			pci_read_config_word(dev, msi_data_reg(pos, 1), &data);
>  		} else {
>  			msg->address_hi = 0;
> -			pci_read_config_word(dev, msi_data_reg(pos, 1), &data);
> +			pci_read_config_word(dev, msi_data_reg(pos, 0), &data);
>  		}
>  		msg->data = data;
>  		break;
-
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