From: Brian King <brking@linux.vnet.ibm.com>
Date: Wed, 3 Dec 2008 17:02:56 +0000 (-0600)
Subject: [SCSI] ibmvfc: Fix errors due to inconsistent command data
X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=a528ab7a324f1dbb3598ae0ecd238ab7dd974294;p=linux-beck.git

[SCSI] ibmvfc: Fix errors due to inconsistent command data

In order to ensure the VIOS sees a consistent command buffer, we
need to add a memory barrier after building the command buffer
but before sending the command.

Signed-off-by: Brian King <brking@linux.vnet.ibm.com>
Signed-off-by: James Bottomley <James.Bottomley@HansenPartnership.com>
---

diff --git a/drivers/scsi/ibmvscsi/ibmvfc.c b/drivers/scsi/ibmvscsi/ibmvfc.c
index 2aa3d695d548..a401e938a87a 100644
--- a/drivers/scsi/ibmvscsi/ibmvfc.c
+++ b/drivers/scsi/ibmvscsi/ibmvfc.c
@@ -1381,6 +1381,8 @@ static int ibmvfc_send_event(struct ibmvfc_event *evt,
 		add_timer(&evt->timer);
 	}
 
+	mb();
+
 	if ((rc = ibmvfc_send_crq(vhost, crq_as_u64[0], crq_as_u64[1]))) {
 		list_del(&evt->queue);
 		del_timer(&evt->timer);