1 files changed, 7 insertions, 2 deletions

diff --git a/drivers/infiniband/hw/ipath/ipath_file_ops.c b/drivers/infiniband/hw/ipath/ipath_file_ops.c
index 1af1f3a907c..ceab52c09cd 100644
--- a/drivers/infiniband/hw/ipath/ipath_file_ops.c
+++ b/drivers/infiniband/hw/ipath/ipath_file_ops.c
@@ -223,8 +223,13 @@ static int ipath_get_base_info(struct file *fp,
                         (unsigned long long) kinfo->spi_subport_rcvhdr_base);
         }
 
-        kinfo->spi_pioindex = (kinfo->spi_piobufbase - dd->ipath_piobufbase) /
-                dd->ipath_palign;
+        /*
+         * All user buffers are 2KB buffers.  If we ever support
+         * giving 4KB buffers to user processes, this will need some
+         * work.
+         */
+        kinfo->spi_pioindex = (kinfo->spi_piobufbase -
+                (dd->ipath_piobufbase & 0xffffffff)) / dd->ipath_palign;
         kinfo->spi_pioalign = dd->ipath_palign;
 
         kinfo->spi_qpair = IPATH_KD_QP;