[PATCH] IB: Keep MAD work completion valid

Replace the *wc field in ib_mad_recv_wc from pointing to a structure on the
stack to one allocated with the received MAD buffer.  This allows a client to
access the *wc field after their receive completion handler has returned.

Signed-off-by: Sean Hefty <sean.hefty@intel.com>
Signed-off-by: Roland Dreier <roland@topspin.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

2 files changed, 3 insertions, 1 deletions

diff --git a/drivers/infiniband/core/mad.c b/drivers/infiniband/core/mad.c
index 4ec7fff29b5d..9ed7d42b82a7 100644
--- a/drivers/infiniband/core/mad.c
+++ b/drivers/infiniband/core/mad.c
@@ -1600,7 +1600,8 @@ static void ib_mad_recv_done_handler(struct ib_mad_port_private *port_priv,
                          DMA_FROM_DEVICE);
 
         /* Setup MAD receive work completion from "normal" work completion */
-        recv->header.recv_wc.wc = wc;
+        recv->header.wc = *wc;
+        recv->header.recv_wc.wc = &recv->header.wc;
         recv->header.recv_wc.mad_len = sizeof(struct ib_mad);
         recv->header.recv_wc.recv_buf.mad = &recv->mad.mad;
         recv->header.recv_wc.recv_buf.grh = &recv->grh;
diff --git a/drivers/infiniband/core/mad_priv.h b/drivers/infiniband/core/mad_priv.h
index 4ba9f726bf1d..008cbcb94b15 100644
--- a/drivers/infiniband/core/mad_priv.h
+++ b/drivers/infiniband/core/mad_priv.h
@@ -69,6 +69,7 @@ struct ib_mad_list_head {
 struct ib_mad_private_header {
         struct ib_mad_list_head mad_list;
         struct ib_mad_recv_wc recv_wc;
+        struct ib_wc wc;
         DECLARE_PCI_UNMAP_ADDR(mapping)
 } __attribute__ ((packed));