linux-kernel - Re: [PATCH v2 5/6] AHCI: Check MRSM bit when multiple MSIs enabled

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Date:	Thu, 05 Sep 2013 18:32:36 +0400
From:	Sergei Shtylyov <sergei.shtylyov@...entembedded.com>
To:	Alexander Gordeev <agordeev@...hat.com>
CC:	linux-kernel@...r.kernel.org, x86@...nel.org,
	linux-pci@...r.kernel.org, linux-ide@...r.kernel.org,
	Tejun Heo <tj@...nel.org>, Ingo Molnar <mingo@...nel.org>,
	Joerg Roedel <joro@...tes.org>,
	Jan Beulich <JBeulich@...e.com>,
	Bjorn Helgaas <bhelgaas@...gle.com>
Subject: Re: [PATCH v2 5/6] AHCI: Check MRSM bit when multiple MSIs enabled

Hello.

On 09/05/2013 04:54 PM, Alexander Gordeev wrote:

> Do not trust the hardware and always check if MSI
> Revert to Single Message mode was enforced. Fall
> back to the single MSI mode in case it did. Not
> doing so might screw up the interrupt handling.

> Signed-off-by: Alexander Gordeev <agordeev@...hat.com>
> ---
>   drivers/ata/ahci.c |   16 ++++++++++++++++
>   drivers/ata/ahci.h |    1 +
>   2 files changed, 17 insertions(+), 0 deletions(-)

> diff --git a/drivers/ata/ahci.c b/drivers/ata/ahci.c
> index a6bb618..af5d535 100644
> --- a/drivers/ata/ahci.c
> +++ b/drivers/ata/ahci.c
> @@ -1091,6 +1091,14 @@ static inline void ahci_gtf_filter_workaround(struct ata_host *host)
>   {}
>   #endif
>
> +static int ahci_get_mrsm(struct ahci_host_priv *hpriv)
> +{
> +	void __iomem *mmio = hpriv->mmio;
> +	u32 ctl = readl(mmio + HOST_CTL);
> +
> +	return (ctl & HOST_MRSM);

    Parens not needed here, in case you'll respin this once more.

WBR, Sergei

--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/