linux-kernel - [PATCH] PCI: take the rescan lock when adding devices during host probe

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Message-ID: <20240926130924.36409-1-brgl@bgdev.pl>
Date: Thu, 26 Sep 2024 15:09:23 +0200
From: Bartosz Golaszewski <brgl@...ev.pl>
To: Bjorn Helgaas <bhelgaas@...gle.com>
Cc: linux-pci@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	Bartosz Golaszewski <bartosz.golaszewski@...aro.org>,
	Konrad Dybcio <konradybcio@...nel.org>
Subject: [PATCH] PCI: take the rescan lock when adding devices during host probe

From: Bartosz Golaszewski <bartosz.golaszewski@...aro.org>

Since adding the PCI power control code, we may end up with a race
between the pwrctl platform device rescanning the bus and the host
controller probe function. The latter needs to take the rescan lock when
adding devices or may crash.

Reported-by: Konrad Dybcio <konradybcio@...nel.org>
Fixes: 4565d2652a37 ("PCI/pwrctl: Add PCI power control core code")
Signed-off-by: Bartosz Golaszewski <bartosz.golaszewski@...aro.org>
---
 drivers/pci/probe.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/pci/probe.c b/drivers/pci/probe.c
index 4f68414c3086..f1615805f5b0 100644
--- a/drivers/pci/probe.c
+++ b/drivers/pci/probe.c
@@ -3105,7 +3105,9 @@ int pci_host_probe(struct pci_host_bridge *bridge)
 	list_for_each_entry(child, &bus->children, node)
 		pcie_bus_configure_settings(child);
 
+	pci_lock_rescan_remove();
 	pci_bus_add_devices(bus);
+	pci_unlock_rescan_remove();
 	return 0;
 }
 EXPORT_SYMBOL_GPL(pci_host_probe);
-- 
2.30.2