From e7dbeba85600aa2c8daf99f8f53d9ad27e88b810 Mon Sep 17 00:00:00 2001 From: Jack Morgenstein Date: Thu, 7 Mar 2013 03:46:54 +0000 Subject: net/mlx4_core: Fix endianness bug in set_param_l The set_param_l function assumes casting a u64 pointer to a u32 pointer allows to access the lower 32bits, but it results in writing the upper 32 bits on big endian systems. The fixed function reads the upper 32 bits of the 64 argument, and or's them with the 32 bits of the 32-bit value passed to the function. Since this is now a "read-modify-write" operation, we got many "unintialized variable" warnings which needed to be fixed as well. Reported-by: Alexander Schmidt . Signed-off-by: Jack Morgenstein Signed-off-by: Or Gerlitz Signed-off-by: David S. Miller --- drivers/net/ethernet/mellanox/mlx4/mlx4.h | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) (limited to 'drivers/net/ethernet/mellanox/mlx4/mlx4.h') diff --git a/drivers/net/ethernet/mellanox/mlx4/mlx4.h b/drivers/net/ethernet/mellanox/mlx4/mlx4.h index cf883345af88..d738454116a0 100644 --- a/drivers/net/ethernet/mellanox/mlx4/mlx4.h +++ b/drivers/net/ethernet/mellanox/mlx4/mlx4.h @@ -1235,7 +1235,7 @@ int mlx4_get_qp_per_mgm(struct mlx4_dev *dev); static inline void set_param_l(u64 *arg, u32 val) { - *((u32 *)arg) = val; + *arg = (*arg & 0xffffffff00000000ULL) | (u64) val; } static inline void set_param_h(u64 *arg, u32 val) -- cgit v1.2.1