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net/mlx4_core: clean up cq_res_start_move_to() 

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 <pebolle@tiscali.nl>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Paul Bolle 2014-01-14 20:45:36 +01:00 committed by David S. Miller
parent f7cbdb7d7b
commit c9218a9e67
1 changed files with 19 additions and 33 deletions
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52
drivers/net/ethernet/mellanox/mlx4/resource_tracker.c
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@ -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));