linux-kernel - [PATCH 03/27] PCI: Protect against concurrent change of housekeeping cpumask

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Message-ID: <20250620152308.27492-4-frederic@kernel.org>
Date: Fri, 20 Jun 2025 17:22:44 +0200
From: Frederic Weisbecker <frederic@...nel.org>
To: LKML <linux-kernel@...r.kernel.org>
Cc: Frederic Weisbecker <frederic@...nel.org>,
	Bjorn Helgaas <bhelgaas@...gle.com>,
	Marco Crivellari <marco.crivellari@...e.com>,
	Michal Hocko <mhocko@...e.com>,
	Peter Zijlstra <peterz@...radead.org>,
	Tejun Heo <tj@...nel.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Vlastimil Babka <vbabka@...e.cz>,
	Waiman Long <longman@...hat.com>
Subject: [PATCH 03/27] PCI: Protect against concurrent change of housekeeping cpumask

HK_TYPE_DOMAIN will soon integrate cpuset isolated partitions and
therefore be made modifyable at runtime. Synchronize against the cpumask
update using appropriate locking.

Queue and wait for the PCI call to complete while holding the
housekeeping rwsem. This way the housekeeping update side doesn't need
to propagate its changes to PCI.

Signed-off-by: Frederic Weisbecker <frederic@...nel.org>
---
 drivers/pci/pci-driver.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/pci/pci-driver.c b/drivers/pci/pci-driver.c
index 67db34fd10ee..459d211a408b 100644
--- a/drivers/pci/pci-driver.c
+++ b/drivers/pci/pci-driver.c
@@ -362,7 +362,7 @@ static int pci_call_probe(struct pci_driver *drv, struct pci_dev *dev,
 	dev->is_probed = 1;
 
 	cpu_hotplug_disable();
-
+	housekeeping_lock();
 	/*
 	 * Prevent nesting work_on_cpu() for the case where a Virtual Function
 	 * device is probed from work_on_cpu() of the Physical device.
@@ -392,6 +392,7 @@ static int pci_call_probe(struct pci_driver *drv, struct pci_dev *dev,
 		error = local_pci_probe(&ddi);
 out:
 	dev->is_probed = 0;
+	housekeeping_unlock();
 	cpu_hotplug_enable();
 	return error;
 }
-- 
2.48.1