linux-kernel - Re: [PATCH] sb_edac: Fix detection on SNB machines

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Date:	Mon, 9 Feb 2015 09:20:58 -0500
From:	Aristeu Rozanski <aris@...hat.com>
To:	Borislav Petkov <bp@...en8.de>
Cc:	Andy Lutomirski <luto@...capital.net>,
	Mauro Carvalho Chehab <m.chehab@...sung.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Tony Luck <tony.luck@...el.com>,
	linux-edac <linux-edac@...r.kernel.org>
Subject: Re: [PATCH] sb_edac: Fix detection on SNB machines

On Mon, Feb 09, 2015 at 01:17:17PM +0100, Borislav Petkov wrote:
> From: Borislav Petkov <bp@...e.de>
> Subject: [PATCH] sb_edac: Fix detection on SNB machines
> 
> d0585cd815fa ("sb_edac: Claim a different PCI device") changed the
> probing of sb_edac to look for PCI device 0x3ca0:
> 
> 3f:0e.0 System peripheral: Intel Corporation Xeon E5/Core i7 Processor Home Agent (rev 07)
> 00: 86 80 a0 3c 00 00 00 00 07 00 80 08 00 00 80 00
> ...
> 
> but we're matching for 0x3ca8, i.e. PCI_DEVICE_ID_INTEL_SBRIDGE_IMC_TA
> in sbridge_probe() therefore the probing fails.
> 
> Changing it to probe for 0x3ca0 (PCI_DEVICE_ID_INTEL_SBRIDGE_IMC_HA0),
> .i.e., the 14.0 device, fixes the issue and driver loads successfully
> again:
> 
> [ 2449.013120] EDAC DEBUG: sbridge_init:
> [ 2449.017029] EDAC sbridge: Seeking for: PCI ID 8086:3ca0
> [ 2449.022368] EDAC DEBUG: sbridge_get_onedevice: Detected 8086:3ca0
> [ 2449.028498] EDAC sbridge: Seeking for: PCI ID 8086:3ca0
> [ 2449.033768] EDAC sbridge: Seeking for: PCI ID 8086:3ca8
> [ 2449.039028] EDAC DEBUG: sbridge_get_onedevice: Detected 8086:3ca8
> [ 2449.045155] EDAC sbridge: Seeking for: PCI ID 8086:3ca8
> ...
> 
> Add a debug printk while at it to be able to catch the failure in the
> future and dump driver version on successful load.
> 
> Fixes: d0585cd815fa ("sb_edac: Claim a different PCI device")
> Cc: stable@...r.kernel.org # 3.18
> Cc: Tony Luck <tony.luck@...el.com>
> Cc: Andy Lutomirski <luto@...capital.net>
> Cc: Mauro Carvalho Chehab <m.chehab@...sung.com>
> Signed-off-by: Borislav Petkov <bp@...e.de>
> ---
>  drivers/edac/sb_edac.c | 9 ++++++---
>  1 file changed, 6 insertions(+), 3 deletions(-)
> 
> diff --git a/drivers/edac/sb_edac.c b/drivers/edac/sb_edac.c
> index 63aa6730e89e..1acf57ba4c86 100644
> --- a/drivers/edac/sb_edac.c
> +++ b/drivers/edac/sb_edac.c
> @@ -2447,7 +2447,7 @@ static int sbridge_probe(struct pci_dev *pdev, const struct pci_device_id *id)
>  		rc = sbridge_get_all_devices(&num_mc, pci_dev_descr_ibridge_table);
>  		type = IVY_BRIDGE;
>  		break;
> -	case PCI_DEVICE_ID_INTEL_SBRIDGE_IMC_TA:
> +	case PCI_DEVICE_ID_INTEL_SBRIDGE_IMC_HA0:
>  		rc = sbridge_get_all_devices(&num_mc, pci_dev_descr_sbridge_table);
>  		type = SANDY_BRIDGE;
>  		break;
> @@ -2460,8 +2460,11 @@ static int sbridge_probe(struct pci_dev *pdev, const struct pci_device_id *id)
>  		type = BROADWELL;
>  		break;
>  	}
> -	if (unlikely(rc < 0))
> +	if (unlikely(rc < 0)) {
> +		edac_dbg(0, "couldn't get all devices for 0x%x\n", pdev->device);
>  		goto fail0;
> +	}
> +
>  	mc = 0;
>  
>  	list_for_each_entry(sbridge_dev, &sbridge_edac_list, list) {
> @@ -2474,7 +2477,7 @@ static int sbridge_probe(struct pci_dev *pdev, const struct pci_device_id *id)
>  			goto fail1;
>  	}
>  
> -	sbridge_printk(KERN_INFO, "Driver loaded.\n");
> +	sbridge_printk(KERN_INFO, "%s\n", SBRIDGE_REVISION);
>  
>  	mutex_unlock(&sbridge_edac_lock);
>  	return 0;

looks good to me

Acked-by: Aristeu Rozanski <aris@...hat.com>


-- 
Aristeu

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