ACK. OK.
-Jack
On Tue, 14 Jan 2014 20:45:36 +0100
Paul Bolle <pebo...@tiscali.nl> wrote:
> Building resource_tracker.o triggers a GCC warning:
> drivers/net/ethernet/mellanox/mlx4/resource_tracker.c: In
> function 'mlx4_HW2SW_CQ_wrapper':
> drivers/net/ethernet/mellanox/mlx4/resource_tracker.c:3019:16:
> warning: 'cq' may be used uninitialized in this function
> [-Wmaybe-uninitialized] atomic_dec(&cq->mtt->ref_count); ^
>
> This is a false positive. But a cleanup of cq_res_start_move_to() can
> help GCC here. The code currently uses a switch statement where an
> if/else construct would do too, since only two of the switch's four
> cases can ever occur. Dropping that switch makes the warning go away.
>
> While we're at it, add some missing braces.
>
> Signed-off-by: Paul Bolle <pebo...@tiscali.nl>
> ---
> v2: adjust to Jack's review.
>
> .../net/ethernet/mellanox/mlx4/resource_tracker.c | 52
> ++++++++-------------- 1 file changed, 19 insertions(+), 33
> deletions(-)
>
> diff --git a/drivers/net/ethernet/mellanox/mlx4/resource_tracker.c
> b/drivers/net/ethernet/mellanox/mlx4/resource_tracker.c index
> 2f3f2bc..15cd659 100644 ---
> a/drivers/net/ethernet/mellanox/mlx4/resource_tracker.c +++
> b/drivers/net/ethernet/mellanox/mlx4/resource_tracker.c @@ -1340,43
> +1340,29 @@ static int cq_res_start_move_to(struct mlx4_dev *dev, int
> slave, int cqn, spin_lock_irq(mlx4_tlock(dev));
> r = res_tracker_lookup(&tracker->res_tree[RES_CQ], cqn);
> - if (!r)
> + if (!r) {
> err = -ENOENT;
> - else if (r->com.owner != slave)
> + } else if (r->com.owner != slave) {
> err = -EPERM;
> - else {
> - switch (state) {
> - case RES_CQ_BUSY:
> - err = -EBUSY;
> - break;
> -
> - case RES_CQ_ALLOCATED:
> - if (r->com.state != RES_CQ_HW)
> - err = -EINVAL;
> - else if (atomic_read(&r->ref_count))
> - err = -EBUSY;
> - else
> - err = 0;
> - break;
> -
> - case RES_CQ_HW:
> - if (r->com.state != RES_CQ_ALLOCATED)
> - err = -EINVAL;
> - else
> - err = 0;
> - break;
> -
> - default:
> + } else if (state == RES_CQ_ALLOCATED) {
> + if (r->com.state != RES_CQ_HW)
> err = -EINVAL;
> - }
> + else if (atomic_read(&r->ref_count))
> + err = -EBUSY;
> + else
> + err = 0;
> + } else if (state != RES_CQ_HW || r->com.state !=
> RES_CQ_ALLOCATED) {
> + err = -EINVAL;
> + } else {
> + err = 0;
> + }
>
> - if (!err) {
> - r->com.from_state = r->com.state;
> - r->com.to_state = state;
> - r->com.state = RES_CQ_BUSY;
> - if (cq)
> - *cq = r;
> - }
> + if (!err) {
> + r->com.from_state = r->com.state;
> + r->com.to_state = state;
> + r->com.state = RES_CQ_BUSY;
> + if (cq)
> + *cq = r;
> }
>
> spin_unlock_irq(mlx4_tlock(dev));
--
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