linux-kernel - Re: [PATCH] sb_edac: fix TAD presence check for sbridge_mci_bind

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Message-ID: <20150805182036.GW23305@redhat.com>
Date:	Wed, 5 Aug 2015 14:20:36 -0400
From:	Aristeu Rozanski <aris@...hat.com>
To:	Seth Jennings <sjenning@...hat.com>
Cc:	Mauro Carvalho Chehab <mchehab@....samsung.com>,
	Tony Luck <tony.luck@...el.com>, linux-edac@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] sb_edac: fix TAD presence check for
 sbridge_mci_bind_devs()

On Wed, Aug 05, 2015 at 01:16:01PM -0500, Seth Jennings wrote:
> In 7d375bff, NUM_CHANNELS was changed to 8 and the channel space was
> renumerated to handle EN, EP, and EX configurations.
> 
> The *_mci_bind_devs functions, except for sbridge_mci_bind_devs(), got a
> new device presence check in the form of saw_chan_mask.  However,
> sbridge_mci_bind_devs() still uses the NUM_CHANNELS for loop.
> 
> With the increase in NUM_CHANNELS, this loop fails at index 4 since
> SB only has 4 TADs.  This results in the following error on SB machines:
> 
> EDAC sbridge: Some needed devices are missing
> EDAC sbridge: Couldn't find mci handler
> EDAC sbridge: Couldn't find mci handle
> 
> This patch adapts the saw_chan_mask logic for sbridge_mci_bind_devs() as
> well.
> 
> After this patch:
> 
> EDAC MC0: Giving out device to module sbridge_edac.c controller Sandy Bridge Socket#0: DEV 0000:3f:0e.0 (POLLED)
> EDAC MC1: Giving out device to module sbridge_edac.c controller Sandy Bridge Socket#1: DEV 0000:7f:0e.0 (POLLED)

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

> 
> Signed-off-by: Seth Jennings <sjenning@...hat.com>
> ---
>  drivers/edac/sb_edac.c | 8 ++++----
>  1 file changed, 4 insertions(+), 4 deletions(-)
> 
> diff --git a/drivers/edac/sb_edac.c b/drivers/edac/sb_edac.c
> index ca78311..91cf710 100644
> --- a/drivers/edac/sb_edac.c
> +++ b/drivers/edac/sb_edac.c
> @@ -1648,6 +1648,7 @@ static int sbridge_mci_bind_devs(struct mem_ctl_info *mci,
>  {
>  	struct sbridge_pvt *pvt = mci->pvt_info;
>  	struct pci_dev *pdev;
> +	u8 saw_chan_mask = 0;
>  	int i;
>  
>  	for (i = 0; i < sbridge_dev->n_devs; i++) {
> @@ -1681,6 +1682,7 @@ static int sbridge_mci_bind_devs(struct mem_ctl_info *mci,
>  		{
>  			int id = pdev->device - PCI_DEVICE_ID_INTEL_SBRIDGE_IMC_TAD0;
>  			pvt->pci_tad[id] = pdev;
> +			saw_chan_mask |= 1 << id;
>  		}
>  			break;
>  		case PCI_DEVICE_ID_INTEL_SBRIDGE_IMC_DDRIO:
> @@ -1701,10 +1703,8 @@ static int sbridge_mci_bind_devs(struct mem_ctl_info *mci,
>  	    !pvt-> pci_tad || !pvt->pci_ras  || !pvt->pci_ta)
>  		goto enodev;
>  
> -	for (i = 0; i < NUM_CHANNELS; i++) {
> -		if (!pvt->pci_tad[i])
> -			goto enodev;
> -	}
> +	if (saw_chan_mask != 0x0f)
> +		goto enodev;
>  	return 0;
>  
>  enodev:
> -- 
> 2.4.3
> 

-- 
Aristeu

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