netdev - [PATCH net] sfc: Avoid NULL pointer dereference on systems without numa awareness

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Message-ID: <164857006953.8140.3265568858101821256.stgit@palantir17.mph.net>
Date:   Tue, 29 Mar 2022 17:07:49 +0100
From:   Martin Habets <habetsm.xilinx@...il.com>
To:     kuba@...nel.org, pabeni@...hat.com, davem@...emloft.net
Cc:     netdev@...r.kernel.org, ihuguet@...hat.com, ecree.xilinx@...il.com
Subject: [PATCH net] sfc: Avoid NULL pointer dereference on systems without
 numa awareness

On such systems cpumask_of_node() returns NULL, which bitmap
operations are not happy with.

Fixes: c265b569a45f ("sfc: default config to 1 channel/core in local NUMA node only")
Fixes: 09a99ab16c60 ("sfc: set affinity hints in local NUMA node only")
Signed-off-by: Martin Habets <habetsm.xilinx@...il.com>
---
 drivers/net/ethernet/sfc/efx_channels.c |   11 ++++-------
 1 file changed, 4 insertions(+), 7 deletions(-)

diff --git a/drivers/net/ethernet/sfc/efx_channels.c b/drivers/net/ethernet/sfc/efx_channels.c
index d6fdcdc530ca..f9064532beb6 100644
--- a/drivers/net/ethernet/sfc/efx_channels.c
+++ b/drivers/net/ethernet/sfc/efx_channels.c
@@ -91,11 +91,9 @@ static unsigned int count_online_cores(struct efx_nic *efx, bool local_node)
 	}
 
 	cpumask_copy(filter_mask, cpu_online_mask);
-	if (local_node) {
-		int numa_node = pcibus_to_node(efx->pci_dev->bus);
-
-		cpumask_and(filter_mask, filter_mask, cpumask_of_node(numa_node));
-	}
+	if (local_node)
+		cpumask_and(filter_mask, filter_mask,
+			    cpumask_of_pcibus(efx->pci_dev->bus));
 
 	count = 0;
 	for_each_cpu(cpu, filter_mask) {
@@ -386,8 +384,7 @@ int efx_probe_interrupts(struct efx_nic *efx)
 #if defined(CONFIG_SMP)
 void efx_set_interrupt_affinity(struct efx_nic *efx)
 {
-	int numa_node = pcibus_to_node(efx->pci_dev->bus);
-	const struct cpumask *numa_mask = cpumask_of_node(numa_node);
+	const struct cpumask *numa_mask = cpumask_of_pcibus(efx->pci_dev->bus);
 	struct efx_channel *channel;
 	unsigned int cpu;