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Commit 06f579de authored by Yang, Bo's avatar Yang, Bo Committed by James Bottomley
Browse files

[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: default avatarBo Yang <bo.yang@lsi.com>
Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
Cc: Stable Tree <stable@kernel.org>
Signed-off-by: default avatarJames Bottomley <James.Bottomley@HansenPartnership.com>
parent d211f052

drivers/scsi/megaraid/megaraid_sas.c

+6 −0
Original line number Diff line number Diff line
@@ -198,6 +198,9 @@ megasas_clear_intr_xscale(struct megasas_register_set __iomem * regs) 
	 */

	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_register_set __iomem * regs) 
	 */

	writel(status, &regs->outbound_doorbell_clear);



	/* Dummy readl to force pci flush */

	readl(&regs->outbound_doorbell_clear);



	return 0;

}

/**