From: Nitesh Narayan Lal <nitesh@redhat.com>
Date: Fri, 3 Sep 2021 15:24:29 +0000 (-0400)
Subject: net/mlx5: Use irq_set_affinity_and_hint()
X-Git-Tag: v5.17-rc1~92^2~3
X-Git-Url: http://git.ipfire.org/?a=commitdiff_plain;h=7451e9ea8e2055af39afe7ff39a5f68d8ec6b98d;p=thirdparty%2Fkernel%2Flinux.git

net/mlx5: Use irq_set_affinity_and_hint()

The driver uses irq_set_affinity_hint() to update the affinity_hint mask
that is consumed by the userspace to distribute the interrupts and to apply
the provided mask as the affinity for the mlx5 interrupts. However,
irq_set_affinity_hint() applying the provided cpumask as an affinity for
the interrupt 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_set_affinity_and_hint()
where the provided mask needs to be applied as the affinity and
affinity_hint pointer needs to be set and replace with
irq_update_affinity_hint() where only affinity_hint needs to be updated.

Signed-off-by: Nitesh Narayan Lal <nitesh@redhat.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Reviewed-by: Leon Romanovsky <leonro@nvidia.com>
Link: https://lore.kernel.org/r/20210903152430.244937-14-nitesh@redhat.com
---

diff --git a/drivers/net/ethernet/mellanox/mlx5/core/pci_irq.c b/drivers/net/ethernet/mellanox/mlx5/core/pci_irq.c
index 830444f927d45..54fb67cec5446 100644
--- a/drivers/net/ethernet/mellanox/mlx5/core/pci_irq.c
+++ b/drivers/net/ethernet/mellanox/mlx5/core/pci_irq.c
@@ -143,11 +143,11 @@ static void irq_release(struct mlx5_irq *irq)
 	struct mlx5_irq_pool *pool = irq->pool;
 
 	xa_erase(&pool->irqs, irq->index);
-	/* free_irq requires that affinity and rmap will be cleared
+	/* free_irq requires that affinity_hint and rmap will be cleared
 	 * before calling it. This is why there is asymmetry with set_rmap
 	 * which should be called after alloc_irq but before request_irq.
 	 */
-	irq_set_affinity_hint(irq->irqn, NULL);
+	irq_update_affinity_hint(irq->irqn, NULL);
 	free_cpumask_var(irq->mask);
 	free_irq(irq->irqn, &irq->nh);
 	kfree(irq);
@@ -316,7 +316,7 @@ static struct mlx5_irq *irq_pool_create_irq(struct mlx5_irq_pool *pool,
 	if (IS_ERR(irq))
 		return irq;
 	cpumask_copy(irq->mask, affinity);
-	irq_set_affinity_hint(irq->irqn, irq->mask);
+	irq_set_affinity_and_hint(irq->irqn, irq->mask);
 	return irq;
 }
 
@@ -399,7 +399,7 @@ irq_pool_request_vector(struct mlx5_irq_pool *pool, int vecidx,
 	if (!irq_pool_is_sf_pool(pool) && !pool->xa_num_irqs.max &&
 	    cpumask_empty(irq->mask))
 		cpumask_set_cpu(0, irq->mask);
-	irq_set_affinity_hint(irq->irqn, irq->mask);
+	irq_set_affinity_and_hint(irq->irqn, irq->mask);
 unlock:
 	mutex_unlock(&pool->lock);
 	return irq;