RDMA/cxgb3: Fix page shift calculation in build_phys_page_list()

The existing logic incorrectly maps this buffer list:

    0: addr 0x10001000, size 0x1000
    1: addr 0x10002000, size 0x1000

To this bogus page list:

    0: 0x10000000
    1: 0x10002000

The shift calculation must also take into account the address of the
first entry masked by the page_mask as well as the last address+size
rounded up to the next page size.

Signed-off-by: Steve Wise <swise@opengridcomputing.com>
Signed-off-by: Roland Dreier <rolandd@cisco.com>

diff --git a/drivers/infiniband/hw/cxgb3/iwch_mem.c b/drivers/infiniband/hw/cxgb3/iwch_mem.c
index a6c2c4b..73bfd16 100644 (file)
--- a/drivers/infiniband/hw/cxgb3/iwch_mem.c
+++ b/drivers/infiniband/hw/cxgb3/iwch_mem.c
@@ -122,6 +122,13 @@ int build_phys_page_list(struct ib_phys_buf *buffer_list,
                *total_size += buffer_list[i].size;
                if (i > 0)
                        mask |= buffer_list[i].addr;
+               else
+                       mask |= buffer_list[i].addr & PAGE_MASK;
+               if (i != num_phys_buf - 1)
+                       mask |= buffer_list[i].addr + buffer_list[i].size;
+               else
+                       mask |= (buffer_list[i].addr + buffer_list[i].size +
+                               PAGE_SIZE - 1) & PAGE_MASK;
        }
 
        if (*total_size > 0xFFFFFFFFULL)