[SCSI] ibmvscsi compatibility fix

Linda Xie ever so gently pointed out that she had a patch
to preserve compatibility with older SLES targets, and I told
her we didn't need to push it to mainline.

This patch explicitly checks the version of the IBMVSCSI target
and ensures that large scatterlists are not sent to older
targets.

Signed-off-by: Linda Xie <lxie@us.ibm.com>
Signed-off-by: Dave Boutcher <boutcher@us.ibm.com>
Signed-off-by: James Bottomley <James.Bottomley@SteelEye.com>

diff --git a/drivers/scsi/ibmvscsi/ibmvscsi.c b/drivers/scsi/ibmvscsi/ibmvscsi.c
index 5b14934ba861f0f119a9c48e809b0aea8340ebbc..ff25210b00bac82b7ea9b500c5c528fafbed92b5 100644 (file)
--- a/drivers/scsi/ibmvscsi/ibmvscsi.c
+++ b/drivers/scsi/ibmvscsi/ibmvscsi.c
@@ -727,6 +727,16 @@ static void adapter_info_rsp(struct srp_event_struct *evt_struct)
                if (hostdata->madapter_info.port_max_txu[0]) 
                        hostdata->host->max_sectors = 
                                hostdata->madapter_info.port_max_txu[0] >> 9;
+               
+               if (hostdata->madapter_info.os_type == 3 &&
+                   strcmp(hostdata->madapter_info.srp_version, "1.6a") <= 0) {
+                       printk("ibmvscsi: host (Ver. %s) doesn't support large"
+                              "transfers\n",
+                              hostdata->madapter_info.srp_version);
+                       printk("ibmvscsi: limiting scatterlists to %d\n",
+                              MAX_INDIRECT_BUFS);
+                       hostdata->host->sg_tablesize = MAX_INDIRECT_BUFS;
+               }
        }
 }