From df93ffcd748ce41e7b716c3056ae511939bb745e Mon Sep 17 00:00:00 2001
From: Mike Christie <michaelc@cs.wisc.edu>
Date: Thu, 13 Dec 2007 12:43:42 -0600
Subject: [PATCH] [SCSI] iscsi_tcp: fix setting of r2t

If we negotiate for X r2ts we have to use only X r2ts. We cannot
round up (we could send less though). It is ok to fail if it
is not something the driver can handle, so this patch just does
that.

Signed-off-by: Mike Christie <michaelc@cs.wisc.edu>
Signed-off-by: James Bottomley <James.Bottomley@HansenPartnership.com>
---
 drivers/scsi/iscsi_tcp.c | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/drivers/scsi/iscsi_tcp.c b/drivers/scsi/iscsi_tcp.c
index edebdf27af9b1..e5be5fd4ef583 100644
--- a/drivers/scsi/iscsi_tcp.c
+++ b/drivers/scsi/iscsi_tcp.c
@@ -1774,12 +1774,12 @@ iscsi_conn_set_param(struct iscsi_cls_conn *cls_conn, enum iscsi_param param,
 		break;
 	case ISCSI_PARAM_MAX_R2T:
 		sscanf(buf, "%d", &value);
-		if (session->max_r2t == roundup_pow_of_two(value))
+		if (value <= 0 || !is_power_of_2(value))
+			return -EINVAL;
+		if (session->max_r2t == value)
 			break;
 		iscsi_r2tpool_free(session);
 		iscsi_set_param(cls_conn, param, buf, buflen);
-		if (session->max_r2t & (session->max_r2t - 1))
-			session->max_r2t = roundup_pow_of_two(session->max_r2t);
 		if (iscsi_r2tpool_alloc(session))
 			return -ENOMEM;
 		break;
-- 
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