From 154fb614df83086ceb18a2c19908154e78d4dc98 Mon Sep 17 00:00:00 2001
From: Dave C Boutcher <sleddog@us.ibm.com>
Date: Tue, 13 Sep 2005 10:09:02 -0500
Subject: [PATCH] [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>
---
drivers/scsi/ibmvscsi/ibmvscsi.c | 10 ++++++++++
1 file changed, 10 insertions(+)
diff --git a/drivers/scsi/ibmvscsi/ibmvscsi.c b/drivers/scsi/ibmvscsi/ibmvscsi.c
index 5b14934ba861..ff25210b00ba 100644
--- 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;
+ }
}
}
--
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