From: Tomas Henzl <thenzl@redhat.com>
To: "'linux-scsi@vger.kernel.org'" <linux-scsi@vger.kernel.org>
Cc: "Sumit.Saxena@avagotech.com" <Sumit.Saxena@avagotech.com>,
"Desai, Kashyap" <Kashyap.Desai@avagotech.com>,
Uday Lingala <uday.lingala@avagotech.com>
Subject: megaraid_sas: add an i/o barrier
Date: Fri, 29 Jan 2016 18:35:01 +0100 [thread overview]
Message-ID: <56ABA2C5.6060603@redhat.com> (raw)
A barrier should be added to ensure proper
ordering of memory mapped writes.
Signed-off-by: Tomas Henzl <thenzl@redhat.com>
---
drivers/scsi/megaraid/megaraid_sas_fusion.c | 1 +
1 file changed, 1 insertion(+)
diff --git a/drivers/scsi/megaraid/megaraid_sas_fusion.c b/drivers/scsi/megaraid/megaraid_sas_fusion.c
index d9d0029fb1..98a848bdfd 100644
--- a/drivers/scsi/megaraid/megaraid_sas_fusion.c
+++ b/drivers/scsi/megaraid/megaraid_sas_fusion.c
@@ -204,6 +204,7 @@ megasas_fire_cmd_fusion(struct megasas_instance *instance,
&instance->reg_set->inbound_low_queue_port);
writel(le32_to_cpu(req_desc->u.high),
&instance->reg_set->inbound_high_queue_port);
+ mmiowb();
spin_unlock_irqrestore(&instance->hba_lock, flags);
#endif
}
--
2.4.3
next reply other threads:[~2016-01-29 17:35 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-01-29 17:35 Tomas Henzl [this message]
2016-02-01 4:45 ` megaraid_sas: add an i/o barrier Kashyap Desai
2016-02-01 12:53 ` Tomas Henzl
2016-02-01 13:24 ` Kashyap Desai
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