[PATCH 08/10] IB: Fix data length for RMPP SA sends

[Roland Dreier <rolandd@cisco.com>]

Subject: [PATCH] IB: Fix data length for RMPP SA sends
From: Hal Rosenstock <halr@voltaire.com>
Date: 1127163061 -0700

We need to subtract off the header length from our payload
length when sending multi-packet SA messages.

Signed-off-by: Hal Rosenstock <halr@voltaire.com>
Signed-off-by: Roland Dreier <rolandd@cisco.com>

---

 drivers/infiniband/core/user_mad.c |    5 +++--
 1 files changed, 3 insertions(+), 2 deletions(-)

eff4c654b1a4a5e5493fbdc3affa6dd48765c085
diff --git a/drivers/infiniband/core/user_mad.c b/drivers/infiniband/core/user_mad.c
--- a/drivers/infiniband/core/user_mad.c
+++ b/drivers/infiniband/core/user_mad.c
@@ -334,10 +334,11 @@ static ssize_t ib_umad_write(struct file
 			ret = -EINVAL;
 			goto err_ah;
 		}
-		/* Validate that management class can support RMPP */
+
+		/* Validate that the management class can support RMPP */
 		if (rmpp_mad->mad_hdr.mgmt_class == IB_MGMT_CLASS_SUBN_ADM) {
 			hdr_len = offsetof(struct ib_sa_mad, data);
-			data_len = length;
+			data_len = length - hdr_len;
 		} else if ((rmpp_mad->mad_hdr.mgmt_class >= IB_MGMT_CLASS_VENDOR_RANGE2_START) &&
 			    (rmpp_mad->mad_hdr.mgmt_class <= IB_MGMT_CLASS_VENDOR_RANGE2_END)) {
 				hdr_len = offsetof(struct ib_vendor_mad, data);