Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 23.128.96.18 as permitted sender) client-ip=23.128.96.18;
From:   Nitesh Narayan Lal <nitesh@redhat.com>
To:     linux-kernel@vger.kernel.org, linux-scsi@vger.kernel.org,
        intel-wired-lan@lists.osuosl.org, netdev@vger.kernel.org,
        linux-api@vger.kernel.org, linux-pci@vger.kernel.org,
        tglx@linutronix.de, jesse.brandeburg@intel.com,
        robin.murphy@arm.com, mtosatti@redhat.com, mingo@kernel.org,
        jbrandeb@kernel.org, frederic@kernel.org, juri.lelli@redhat.com,
        abelits@marvell.com, bhelgaas@google.com, rostedt@goodmis.org,
        peterz@infradead.org, davem@davemloft.net,
        akpm@linux-foundation.org, sfr@canb.auug.org.au,
        stephen@networkplumber.org, rppt@linux.vnet.ibm.com,
        chris.friesen@windriver.com, maz@kernel.org, nhorman@tuxdriver.com,
        pjwaskiewicz@gmail.com, sassmann@redhat.com, thenzl@redhat.com,
        kashyap.desai@broadcom.com, sumit.saxena@broadcom.com,
        shivasharan.srikanteshwara@broadcom.com,
        sathya.prakash@broadcom.com, sreekanth.reddy@broadcom.com,
        suganath-prabu.subramani@broadcom.com, james.smart@broadcom.com,
        dick.kennedy@broadcom.com, jkc@redhat.com, faisal.latif@intel.com,
        shiraz.saleem@intel.com, tariqt@nvidia.com, ahleihel@redhat.com,
        kheib@redhat.com, borisp@nvidia.com, saeedm@nvidia.com,
        benve@cisco.com, govind@gmx.com, jassisinghbrar@gmail.com,
        ajit.khaparde@broadcom.com, sriharsha.basavapatna@broadcom.com,
        somnath.kotur@broadcom.com, nilal@redhat.com,
        tatyana.e.nikolova@intel.com, mustafa.ismail@intel.com,
        ahs3@redhat.com, leonro@nvidia.com,
        chandrakanth.patil@broadcom.com, bjorn.andersson@linaro.org,
        chunkuang.hu@kernel.org, yongqiang.niu@mediatek.com,
        baolin.wang7@gmail.com, poros@redhat.com, minlei@redhat.com,
        emilne@redhat.com, jejb@linux.ibm.com, martin.petersen@oracle.com,
        _govind@gmx.com, ley.foon.tan@intel.com, kabel@kernel.org,
        viresh.kumar@linaro.org, Tushar.Khandelwal@arm.com,
        luobin9@huawei.com
Subject: [PATCH v4 14/14] net/mlx4: Use irq_update_affinity_hint
Date:   Mon, 19 Jul 2021 14:07:46 -0400
Message-Id: <20210719180746.1008665-15-nitesh@redhat.com>
In-Reply-To: <20210719180746.1008665-1-nitesh@redhat.com>
References: <20210719180746.1008665-1-nitesh@redhat.com>
MIME-Version: 1.0
Content-Transfer-Encoding: 8bit
Precedence: bulk

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>
Reviewed-by: Tariq Toukan <tariqt@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