linux-kernel - [037/107] [SCSI] libiscsi_tcp: fix LLD data allocation

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Message-Id: <20111102221453.495886972@clark.kroah.org>
Date:	Wed, 02 Nov 2011 15:14:03 -0700
From:	Greg KH <gregkh@...e.de>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:	torvalds@...ux-foundation.org, akpm@...ux-foundation.org,
	alan@...rguk.ukuu.org.uk, Mike Christie <michaelc@...wisc.edu>,
	James Bottomley <JBottomley@...allels.com>
Subject: [037/107] [SCSI] libiscsi_tcp: fix LLD data allocation

2.6.32-longterm review patch.  If anyone has any objections, please let us know.

------------------

From: Mike Christie <michaelc@...wisc.edu>

commit 74dcd0ec735ba9c5bef254b2f6e53068cf3f9ff0 upstream.

Have libiscsi_tcp have upper layers allocate the LLD data
along with the iscsi_cls_conn struct, so it is refcounted.

Signed-off-by: Mike Christie <michaelc@...wisc.edu>
Signed-off-by: James Bottomley <JBottomley@...allels.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...e.de>

---
 drivers/scsi/libiscsi_tcp.c |   14 +++-----------
 1 file changed, 3 insertions(+), 11 deletions(-)

--- a/drivers/scsi/libiscsi_tcp.c
+++ b/drivers/scsi/libiscsi_tcp.c
@@ -1069,7 +1069,8 @@ iscsi_tcp_conn_setup(struct iscsi_cls_se
 	struct iscsi_cls_conn *cls_conn;
 	struct iscsi_tcp_conn *tcp_conn;
 
-	cls_conn = iscsi_conn_setup(cls_session, sizeof(*tcp_conn), conn_idx);
+	cls_conn = iscsi_conn_setup(cls_session,
+				    sizeof(*tcp_conn) + dd_data_size, conn_idx);
 	if (!cls_conn)
 		return NULL;
 	conn = cls_conn->dd_data;
@@ -1081,22 +1082,13 @@ iscsi_tcp_conn_setup(struct iscsi_cls_se
 
 	tcp_conn = conn->dd_data;
 	tcp_conn->iscsi_conn = conn;
-
-	tcp_conn->dd_data = kzalloc(dd_data_size, GFP_KERNEL);
-	if (!tcp_conn->dd_data) {
-		iscsi_conn_teardown(cls_conn);
-		return NULL;
-	}
+	tcp_conn->dd_data = conn->dd_data + sizeof(*tcp_conn);
 	return cls_conn;
 }
 EXPORT_SYMBOL_GPL(iscsi_tcp_conn_setup);
 
 void iscsi_tcp_conn_teardown(struct iscsi_cls_conn *cls_conn)
 {
-	struct iscsi_conn *conn = cls_conn->dd_data;
-	struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
-
-	kfree(tcp_conn->dd_data);
 	iscsi_conn_teardown(cls_conn);
 }
 EXPORT_SYMBOL_GPL(iscsi_tcp_conn_teardown);


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