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IB/mlx4: Fix compiler warning about uninitialized 'vlan' variable

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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 <pebolle@tiscali.nl>

[ Get rid of unnecessary move of 'is_vlan' initialization.  - Roland ]

Signed-off-by: Roland Dreier <roland@purestorage.com>
This commit is contained in:
Paul Bolle 2013-02-25 09:17:13 -08:00 committed by Roland Dreier
parent a29bec1241
commit 57d88cffc8
1 changed files with 1 additions and 1 deletions
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2
drivers/infiniband/hw/mlx4/qp.c
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@ -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;