IB/ipath: Fix offset returned to ibv_resize_cq()

The wrong offset was being returned to libipathverbs so that when
ibv_resize_cq() calls mmap(), it always fails.

Signed-off-by: Ralph Campbell <ralph.campbell@qlogic.com>
Signed-off-by: Roland Dreier <rolandd@cisco.com>

1 files changed, 14 insertions, 5 deletions

diff --git a/drivers/infiniband/hw/ipath/ipath_cq.c b/drivers/infiniband/hw/ipath/ipath_cq.c
index 08d8ae148cd0..d1380c7a1703 100644
--- a/drivers/infiniband/hw/ipath/ipath_cq.c
+++ b/drivers/infiniband/hw/ipath/ipath_cq.c
@@ -395,12 +395,9 @@ int ipath_resize_cq(struct ib_cq *ibcq, int cqe, struct ib_udata *udata)
                 goto bail;
         }
 
-        /*
-         * Return the address of the WC as the offset to mmap.
-         * See ipath_mmap() for details.
-         */
+        /* Check that we can write the offset to mmap. */
         if (udata && udata->outlen >= sizeof(__u64)) {
-                __u64 offset = (__u64) wc;
+                __u64 offset = 0;
 
                 ret = ib_copy_to_udata(udata, &offset, sizeof(offset));
                 if (ret)
@@ -450,6 +447,18 @@ int ipath_resize_cq(struct ib_cq *ibcq, int cqe, struct ib_udata *udata)
                 struct ipath_mmap_info *ip = cq->ip;
 
                 ipath_update_mmap_info(dev, ip, sz, wc);
+
+                /*
+                 * Return the offset to mmap.
+                 * See ipath_mmap() for details.
+                 */
+                if (udata && udata->outlen >= sizeof(__u64)) {
+                        ret = ib_copy_to_udata(udata, &ip->offset,
+                                               sizeof(ip->offset));
+                        if (ret)
+                                goto bail;
+                }
+
                 spin_lock_irq(&dev->pending_lock);
                 if (list_empty(&ip->pending_mmaps))
                         list_add(&ip->pending_mmaps, &dev->pending_mmaps);