linux-kernel - Re: [PATCH 1/4] scsi: megaraid_sas - Add the dumy readl to force PCI flush

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Message-Id: <20080804174128.a0877c27.akpm@linux-foundation.org>
Date:	Mon, 4 Aug 2008 17:41:28 -0700
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	"Yang, Bo" <Bo.Yang@....com>
Cc:	"'James.Bottomley@...elEye.com'" <James.Bottomley@...elEye.com>,
	"'linux-scsi@...r.kernel.org'" <linux-scsi@...r.kernel.org>,
	"'akpm@...l.org'" <akpm@...uxfoundation.org>,
	"'linux-kernel@...r.kernel.org'" <linux-kernel@...r.kernel.org>,
	"Patro, Sumant" <Sumant.Patro@....com>,
	"Austria, Winston" <Winston.Austria@....com>,
	"poswald@...ell.com" <poswald@...ell.com>
Subject: Re: [PATCH 1/4] scsi: megaraid_sas - Add the dumy readl to force
 PCI flush

On Fri, 1 Aug 2008 10:19:07 -0600 "Yang, Bo" <Bo.Yang@....com> wrote:

> MegaRAID SAS Driver get unexpected Interrupt.  Add the dumy readl to force PCI flush will fix this issue.
> 
> Signed-off-by Bo Yang<bo.yang@....com>
> 
> ---
> drivers/scsi/megaraid/megaraid_sas.c |    6 ++++++
> 1 files changed, 6 insertions(+)
> 
> diff -rupN linux-2.6.28_orig/drivers/scsi/megaraid/megaraid_sas.c linux-2.6.28_new/drivers/scsi/megaraid/megaraid_sas.c
> --- linux-2.6.28_orig/drivers/scsi/megaraid/megaraid_sas.c      2008-07-31 12:00:58.000000000 -0400
> +++ linux-2.6.28_new/drivers/scsi/megaraid/megaraid_sas.c       2008-07-31 12:30:35.000000000 -0400
> @@ -198,6 +198,9 @@ megasas_clear_intr_xscale(struct megasas
>          */
>         writel(status, &regs->outbound_intr_status);
> 
> +       /* Dummy readl to force pci flush */
> +       readl(&regs->outbound_intr_status);
> +
>         return 0;
>  }
> 
> @@ -293,6 +296,9 @@ megasas_clear_intr_ppc(struct megasas_re
>          */
>         writel(status, &regs->outbound_doorbell_clear);
> 
> +       /* Dummy readl to force pci flush */
> +       readl(&regs->outbound_doorbell_clear);
> +
>         return 0;
>  }
>  /**

These patches all had their tabs replaced with spaces.  I fixed them up.

Please always run checkpatch on all patches.  checkpatch found this:

ERROR: Macros with complex values should be enclosed in parenthesis
#182: FILE: drivers/scsi/megaraid/megaraid_sas.h:586:
+#define MFI_GEN2_ENABLE_INTERRUPT_MASK		0x00000001 | 0x00000004

which is a potential source of bugs.  I queued a patch to fix that also.
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