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-rw-r--r--drivers/scsi/ibmvscsi/ibmvfc.c6
1 files changed, 6 insertions, 0 deletions
diff --git a/drivers/scsi/ibmvscsi/ibmvfc.c b/drivers/scsi/ibmvscsi/ibmvfc.c
index c2eea711a5ce..9372169374e2 100644
--- a/drivers/scsi/ibmvscsi/ibmvfc.c
+++ b/drivers/scsi/ibmvscsi/ibmvfc.c
@@ -3013,6 +3013,7 @@ static struct ibmvfc_async_crq *ibmvfc_next_async_crq(struct ibmvfc_host *vhost)
if (crq->valid & 0x80) {
if (++async_crq->cur == async_crq->size)
async_crq->cur = 0;
+ rmb();
} else
crq = NULL;
@@ -3035,6 +3036,7 @@ static struct ibmvfc_crq *ibmvfc_next_crq(struct ibmvfc_host *vhost)
if (crq->valid & 0x80) {
if (++queue->cur == queue->size)
queue->cur = 0;
+ rmb();
} else
crq = NULL;
@@ -3083,12 +3085,14 @@ static void ibmvfc_tasklet(void *data)
while ((async = ibmvfc_next_async_crq(vhost)) != NULL) {
ibmvfc_handle_async(async, vhost);
async->valid = 0;
+ wmb();
}
/* Pull all the valid messages off the CRQ */
while ((crq = ibmvfc_next_crq(vhost)) != NULL) {
ibmvfc_handle_crq(crq, vhost);
crq->valid = 0;
+ wmb();
}
vio_enable_interrupts(vdev);
@@ -3096,10 +3100,12 @@ static void ibmvfc_tasklet(void *data)
vio_disable_interrupts(vdev);
ibmvfc_handle_async(async, vhost);
async->valid = 0;
+ wmb();
} else if ((crq = ibmvfc_next_crq(vhost)) != NULL) {
vio_disable_interrupts(vdev);
ibmvfc_handle_crq(crq, vhost);
crq->valid = 0;
+ wmb();
} else
done = 1;
}
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