netdev - [PATCH v1 14/14] net/mlx4: Use irq_update_affinity

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Message-Id: <20210617182242.8637-15-nitesh@redhat.com>
Date:   Thu, 17 Jun 2021 14:22:42 -0400
From:   Nitesh Narayan Lal <nitesh@...hat.com>
To:     linux-kernel@...r.kernel.org, linux-scsi@...r.kernel.org,
        intel-wired-lan@...ts.osuosl.org, netdev@...r.kernel.org,
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Subject: [PATCH v1 14/14] net/mlx4: Use irq_update_affinity_hint

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@...hat.com>
---
 drivers/net/ethernet/mellanox/mlx4/eq.c | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/drivers/net/ethernet/mellanox/mlx4/eq.c b/drivers/net/ethernet/mellanox/mlx4/eq.c
index 9e48509ed3b2..f549d697ca95 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
 
@@ -1124,7 +1124,7 @@ static void mlx4_free_irqs(struct mlx4_dev *dev)
 		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);
+			irq_update_affinity_hint(eq_table->eq[i].irq, NULL);
 #endif
 			free_irq(eq_table->eq[i].irq, eq_table->eq + i);
 			eq_table->eq[i].have_irq = 0;
-- 
2.27.0