net/mlx4_core: Fix unaligned accesses

Addresses the following kernel logs seen during boot:

Kernel unaligned access at TPC[100ee150] mlx4_QUERY_HCA+0x80/0x248 [mlx4_core]
Kernel unaligned access at TPC[100f071c] mlx4_QUERY_ADAPTER+0x100/0x12c [mlx4_core]
Kernel unaligned access at TPC[100f071c] mlx4_QUERY_ADAPTER+0x100/0x12c [mlx4_core]
Kernel unaligned access at TPC[100f071c] mlx4_QUERY_ADAPTER+0x100/0x12c [mlx4_core]
Kernel unaligned access at TPC[100f071c] mlx4_QUERY_ADAPTER+0x100/0x12c [mlx4_core]

Signed-off-by: David Ahern <david.ahern@oracle.com>
Acked-by: Or Gerlitz <ogerlitz@mellanox.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 14 insertions, 4 deletions

diff --git a/drivers/net/ethernet/mellanox/mlx4/fw.c b/drivers/net/ethernet/mellanox/mlx4/fw.c
index a4079811b176..e30bf57ad7a1 100644
--- a/drivers/net/ethernet/mellanox/mlx4/fw.c
+++ b/drivers/net/ethernet/mellanox/mlx4/fw.c
@@ -56,11 +56,13 @@ MODULE_PARM_DESC(enable_qos, "Enable Enhanced QoS support (default: on)");
 #define MLX4_GET(dest, source, offset)                                \
         do {                                                          \
                 void *__p = (char *) (source) + (offset);             \
+                u64 val;                                              \
                 switch (sizeof (dest)) {                              \
                 case 1: (dest) = *(u8 *) __p;       break;            \
                 case 2: (dest) = be16_to_cpup(__p); break;            \
                 case 4: (dest) = be32_to_cpup(__p); break;            \
-                case 8: (dest) = be64_to_cpup(__p); break;            \
+                case 8: val = get_unaligned((u64 *)__p);              \
+                        (dest) = be64_to_cpu(val);  break;            \
                 default: __buggy_use_of_MLX4_GET();                   \
                 }                                                     \
         } while (0)
@@ -1605,9 +1607,17 @@ static void get_board_id(void *vsd, char *board_id)
                  * swaps each 4-byte word before passing it back to
                  * us.  Therefore we need to swab it before printing.
                  */
-                for (i = 0; i < 4; ++i)
-                        ((u32 *) board_id)[i] =
-                                swab32(*(u32 *) (vsd + VSD_OFFSET_MLX_BOARD_ID + i * 4));
+                u32 *bid_u32 = (u32 *)board_id;
+
+                for (i = 0; i < 4; ++i) {
+                        u32 *addr;
+                        u32 val;
+
+                        addr = (u32 *) (vsd + VSD_OFFSET_MLX_BOARD_ID + i * 4);
+                        val = get_unaligned(addr);
+                        val = swab32(val);
+                        put_unaligned(val, &bid_u32[i]);
+                }
         }
 }