net/mlx4_core: Fix use of ENOSPC around mlx4_counter_alloc()

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When ENOSPC is set the idx is still valid and gets set to the global
MLX4_SINK_COUNTER_INDEX.  However gcc's static analysis cannot tell that
ENOSPC is impossible from mlx4_cmd_imm() and gives this warning:

drivers/net/ethernet/mellanox/mlx4/main.c:2552:28: warning: 'idx' may be
used uninitialized in this function [-Wmaybe-uninitialized]
 2552 |    priv->def_counter[port] = idx;

Also, when ENOSPC is returned mlx4_allocate_default_counters should not
fail.

Fixes: 6de5f7f6a1 ("net/mlx4_core: Allocate default counter per port")
Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>
Signed-off-by: Tariq Toukan <tariqt@mellanox.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

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Tariq Toukan 2020-05-04 11:36:02 +03:00 • committed by David S. Miller

parent bea0c5c942

commit 40e473071d

1 changed files with 3 additions and 1 deletions

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drivers/net/ethernet/mellanox/mlx4/main.c

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