3.2.95-rc1 review patch. If anyone has any objections, please let me know.
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From: Paul Bolle <pebolle@xxxxxxxxxx>
commit 57d88cffc83a2120266bbe9e72cbba5bd5f33675 upstream.
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@xxxxxxxxxx>
[ Get rid of unnecessary move of 'is_vlan' initialization. - Roland ]
Signed-off-by: Roland Dreier <roland@xxxxxxxxxxxxxxx>
[bwh: Backported to 3.2: adjust context]
Signed-off-by: Ben Hutchings <ben@xxxxxxxxxxxxxxx>
---
drivers/infiniband/hw/mlx4/qp.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
--- a/drivers/infiniband/hw/mlx4/qp.c
+++ b/drivers/infiniband/hw/mlx4/qp.c
@@ -1363,7 +1363,7 @@ static int build_mlx_header(struct mlx4_
int is_eth;
int is_vlan = 0;
int is_grh;
- u16 vlan;
+ u16 vlan = 0xffff;
send_size = 0;
for (i = 0; i < wr->num_sge; ++i)