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[SCSI] megaraid_sas: add readl to force PCI posting flush 

MegaRAID SAS Driver get unexpected Interrupt.  Add the dummy readl to
force PCI flush will fix this issue.

Signed-off-by: Bo Yang <bo.yang@lsi.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Cc: Stable Tree <stable@kernel.org>
Signed-off-by: James Bottomley <James.Bottomley@HansenPartnership.com>
This commit is contained in:
Yang, Bo 2008-08-10 12:42:37 -07:00 committed by James Bottomley
parent d211f052fa
commit 06f579dee5
1 changed files with 6 additions and 0 deletions
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6
drivers/scsi/megaraid/megaraid_sas.c
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@ -198,6 +198,9 @@ megasas_clear_intr_xscale(struct megasas_register_set __iomem * regs)
*/ */
writel(status, &regs->outbound_intr_status); writel(status, &regs->outbound_intr_status);
/* Dummy readl to force pci flush */
readl(&regs->outbound_intr_status);
return 0; return 0;
} }
@ -293,6 +296,9 @@ megasas_clear_intr_ppc(struct megasas_register_set __iomem * regs)
*/ */
writel(status, &regs->outbound_doorbell_clear); writel(status, &regs->outbound_doorbell_clear);
/* Dummy readl to force pci flush */
readl(&regs->outbound_doorbell_clear);
return 0; return 0;
} }
/** /**