From 57d88cffc83a2120266bbe9e72cbba5bd5f33675 Mon Sep 17 00:00:00 2001 From: Paul Bolle Date: Mon, 25 Feb 2013 09:17:13 -0800 Subject: IB/mlx4: Fix compiler warning about uninitialized 'vlan' variable MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Building qp.o triggers this gcc warning: drivers/infiniband/hw/mlx4/qp.c: In function ‘mlx4_ib_post_send’: drivers/infiniband/hw/mlx4/qp.c:1862:62: warning: ‘vlan’ may be used uninitialized in this function [-Wmaybe-uninitialized] drivers/infiniband/hw/mlx4/qp.c:1752:6: note: ‘vlan’ was declared here Looking at the code it is clear 'vlan' is only set and used if 'is_eth' is non-zero. But by initializing 'vlan' to 0xffff, on gcc (Ubuntu 4.7.2-22ubuntu1) 4.7.2 on x86-64 at least, we fix the warning, and the compiler was already setting 'vlan' to 0 in the generated code, so there's no real downside. Signed-off-by: Paul Bolle [ Get rid of unnecessary move of 'is_vlan' initialization. - Roland ] Signed-off-by: Roland Dreier diff --git a/drivers/infiniband/hw/mlx4/qp.c b/drivers/infiniband/hw/mlx4/qp.c index f8ac533..ebadebe 100644 --- a/drivers/infiniband/hw/mlx4/qp.c +++ b/drivers/infiniband/hw/mlx4/qp.c @@ -1747,7 +1747,7 @@ static int build_mlx_header(struct mlx4_ib_sqp *sqp, struct ib_send_wr *wr, int spc; int i; int err = 0; - u16 vlan; + u16 vlan = 0xffff; bool is_eth; bool is_vlan = false; bool is_grh; -- cgit v0.10.2