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Subject[PATCH v2 14/14] net/mlx4: Use irq_update_affinity_hint
Date
The driver uses irq_set_affinity_hint() to update the affinity_hint mask
that is consumed by the userspace to distribute the interrupts. However,
under the hood irq_set_affinity_hint() also applies the provided cpumask
(if not NULL) as the affinity for the given interrupt which is an
undocumented side effect.

To remove this side effect irq_set_affinity_hint() has been marked
as deprecated and new interfaces have been introduced. Hence, replace the
irq_set_affinity_hint() with the new interface irq_update_affinity_hint()
that only updates the affinity_hint pointer.

Signed-off-by: Nitesh Narayan Lal <nitesh@redhat.com>
Reviewed-by: Leon Romanovsky <leonro@nvidia.com>
---
drivers/net/ethernet/mellanox/mlx4/eq.c | 8 +++-----
1 file changed, 3 insertions(+), 5 deletions(-)

diff --git a/drivers/net/ethernet/mellanox/mlx4/eq.c b/drivers/net/ethernet/mellanox/mlx4/eq.c
index 9e48509ed3b2..414e390e6b48 100644
--- a/drivers/net/ethernet/mellanox/mlx4/eq.c
+++ b/drivers/net/ethernet/mellanox/mlx4/eq.c
@@ -244,9 +244,9 @@ static void mlx4_set_eq_affinity_hint(struct mlx4_priv *priv, int vec)
cpumask_empty(eq->affinity_mask))
return;

- hint_err = irq_set_affinity_hint(eq->irq, eq->affinity_mask);
+ hint_err = irq_update_affinity_hint(eq->irq, eq->affinity_mask);
if (hint_err)
- mlx4_warn(dev, "irq_set_affinity_hint failed, err %d\n", hint_err);
+ mlx4_warn(dev, "irq_update_affinity_hint failed, err %d\n", hint_err);
}
#endif

@@ -1123,9 +1123,7 @@ static void mlx4_free_irqs(struct mlx4_dev *dev)
for (i = 0; i < dev->caps.num_comp_vectors + 1; ++i)
if (eq_table->eq[i].have_irq) {
free_cpumask_var(eq_table->eq[i].affinity_mask);
-#if defined(CONFIG_SMP)
- irq_set_affinity_hint(eq_table->eq[i].irq, NULL);
-#endif
+ irq_update_affinity_hint(eq_table->eq[i].irq, NULL);
free_irq(eq_table->eq[i].irq, eq_table->eq + i);
eq_table->eq[i].have_irq = 0;
}
--
2.27.0
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