netdev - [RFC 4/9] PCI: hold the rescan mutex when scanning for the first time

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Message-Id: <20240104130123.37115-5-brgl@bgdev.pl>
Date: Thu,  4 Jan 2024 14:01:18 +0100
From: Bartosz Golaszewski <brgl@...ev.pl>
To: Kalle Valo <kvalo@...nel.org>,
	"David S . Miller" <davem@...emloft.net>,
	Eric Dumazet <edumazet@...gle.com>,
	Jakub Kicinski <kuba@...nel.org>,
	Paolo Abeni <pabeni@...hat.com>,
	Rob Herring <robh+dt@...nel.org>,
	Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
	Conor Dooley <conor+dt@...nel.org>,
	Bjorn Andersson <andersson@...nel.org>,
	Konrad Dybcio <konrad.dybcio@...aro.org>,
	Catalin Marinas <catalin.marinas@....com>,
	Will Deacon <will@...nel.org>,
	Bjorn Helgaas <bhelgaas@...gle.com>,
	Heiko Stuebner <heiko@...ech.de>,
	Jernej Skrabec <jernej.skrabec@...il.com>,
	Chris Morgan <macromorgan@...mail.com>,
	Linus Walleij <linus.walleij@...aro.org>,
	Geert Uytterhoeven <geert+renesas@...der.be>,
	Arnd Bergmann <arnd@...db.de>,
	Neil Armstrong <neil.armstrong@...aro.org>,
	Nícolas F . R . A . Prado <nfraprado@...labora.com>,
	Marek Szyprowski <m.szyprowski@...sung.com>,
	Peng Fan <peng.fan@....com>,
	Robert Richter <rrichter@....com>,
	Dan Williams <dan.j.williams@...el.com>,
	Jonathan Cameron <Jonathan.Cameron@...wei.com>,
	Terry Bowman <terry.bowman@....com>,
	Kuppuswamy Sathyanarayanan <sathyanarayanan.kuppuswamy@...ux.intel.com>,
	Ilpo Järvinen <ilpo.jarvinen@...ux.intel.com>,
	Huacai Chen <chenhuacai@...nel.org>,
	Alex Elder <elder@...aro.org>,
	Srini Kandagatla <srinivas.kandagatla@...aro.org>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc: linux-wireless@...r.kernel.org,
	netdev@...r.kernel.org,
	devicetree@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	linux-arm-msm@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org,
	linux-pci@...r.kernel.org,
	Bartosz Golaszewski <bartosz.golaszewski@...aro.org>
Subject: [RFC 4/9] PCI: hold the rescan mutex when scanning for the first time

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

With the introduction of the power sequencing drivers that will be able
to trigger the port rescan, we need to hold the rescan mutex during the
initial pci_host_probe() too or the two could get in each other's way.

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 b7335be56008..957f7afee7ba 100644
--- a/drivers/pci/probe.c
+++ b/drivers/pci/probe.c
@@ -3122,7 +3122,9 @@ int pci_host_probe(struct pci_host_bridge *bridge)
 	struct pci_bus *bus, *child;
 	int ret;
 
+	pci_lock_rescan_remove();
 	ret = pci_scan_root_bus_bridge(bridge);
+	pci_unlock_rescan_remove();
 	if (ret < 0) {
 		dev_err(bridge->dev.parent, "Scanning root bridge failed");
 		return ret;
-- 
2.40.1