linux-kernel - Re: Drives missing at boot

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Message-Id: <20100803114105.7f199878.randy.dunlap@oracle.com>
Date:	Tue, 3 Aug 2010 11:41:05 -0700
From:	Randy Dunlap <randy.dunlap@...cle.com>
To:	Mark Knecht <markknecht@...il.com>
Cc:	Tejun Heo <tj@...nel.org>, Paul Check <paul@...checks.ca>,
	Linux Kernel List <linux-kernel@...r.kernel.org>,
	"linux-ide@...r.kernel.org" <linux-ide@...r.kernel.org>
Subject: Re: Drives missing at boot

On Mon, 2 Aug 2010 15:07:11 -0700 Mark Knecht wrote:

> On Thu, Jul 22, 2010 at 5:39 AM, Tejun Heo <tj@...nel.org> wrote:
> 
> Hi Tejun,
>    I'm finally home and trying to get back to this. I'm really a bad
> programmer so I don't know what I've done wrong but it seems patch
> isn't happy with me.
> 
> c2stable linux # patch --dry-run -p1 <../ata_piix-sidpr-lock.patch
> patching file drivers/ata/ata_piix.c
> patch: **** malformed patch at line 13:

Whenever the patch file was saved on this system, line 13 of it was
split (probably by an email client).  Whenever I see this, I just
join (merge) that line and the next one and try again... sometimes
several lines are malformed and have to be fixed like this.

> 
> c2stable linux #
> 
>    Here's the change I tried to make to a copy of the file:
> 
> c2stable linux # cat ../ata_piix-sidpr-lock.patch
> diff --git a/drivers/ata/ata_piix.c b/drivers/ata/ata_piix.c
> index 7409f98..3971bc0 100644
> --- a/drivers/ata/ata_piix.c
> +++ b/drivers/ata/ata_piix.c
> @@ -158,6 +158,7 @@ struct piix_map_db {
>  struct piix_host_priv {
>         const int *map;
>         u32 saved_iocfg;
> +       spinlock_t sidpr_lock;  /* FIXME: remove once locking in EH is fixed */
> +       printk("MWK - ata_sidpr patch applied!\n");
>         void __iomem *sidpr;
>  };
> 
> @@ -951,12 +952,15 @@ static int piix_sidpr_scr_read(struct ata_link *link,
>                                unsigned int reg, u32 *val)
>  {
>         struct piix_host_priv *hpriv = link->ap->host->private_data;
> +       unsigned long flags;
> 
>         if (reg >= ARRAY_SIZE(piix_sidx_map))
>                 return -EINVAL;
> 
> +       spin_lock_irqsave(&hpriv->sidpr_lock, flags);
>         piix_sidpr_sel(link, reg);
>         *val = ioread32(hpriv->sidpr + PIIX_SIDPR_DATA);
> +       spin_unlock_irqrestore(&hpriv->sidpr_lock, flags);
>         return 0;
>  }
> 
> @@ -964,12 +968,15 @@ static int piix_sidpr_scr_write(struct ata_link *link,
>                                 unsigned int reg, u32 val)
>  {
>         struct piix_host_priv *hpriv = link->ap->host->private_data;
> +       unsigned long flags;
> 
>         if (reg >= ARRAY_SIZE(piix_sidx_map))
>                 return -EINVAL;
> 
> +       spin_lock_irqsave(&hpriv->sidpr_lock, flags);
>         piix_sidpr_sel(link, reg);
>         iowrite32(val, hpriv->sidpr + PIIX_SIDPR_DATA);
> +       spin_unlock_irqrestore(&hpriv->sidpr_lock, flags);
>         return 0;
>  }
> 
> @@ -1566,6 +1573,7 @@ static int __devinit piix_init_one(struct pci_dev *pdev,
>         hpriv = devm_kzalloc(dev, sizeof(*hpriv), GFP_KERNEL);
>         if (!hpriv)
>                 return -ENOMEM;
> +       spin_lock_init(&hpriv->sidpr_lock);
> 
>         /* Save IOCFG, this will be used for cable detection, quirk
>          * detection and restoration on detach.  This is necessary
> c2stable linux #
> 
>    Maybe you can shoot back something that's done correctly and I'll
> start testing.
> 
>    I've tried booting a few times. I've had 3 cold boot failures so
> far. No warm boot failures. Each time it failed on cold boot a warm
> boot fixed it.


---
~Randy
*** Remember to use Documentation/SubmitChecklist when testing your code ***
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