linux-kernel - [PATCH v8 12/17] PCI: hold the rescan mutex when scanning for the first time

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Date: Tue, 28 May 2024 21:03:20 +0200
From: Bartosz Golaszewski <brgl@...ev.pl>
To: Liam Girdwood <lgirdwood@...il.com>, Mark Brown <broonie@...nel.org>, 
 Rob Herring <robh@...nel.org>, Krzysztof Kozlowski <krzk+dt@...nel.org>, 
 Conor Dooley <conor+dt@...nel.org>, Marcel Holtmann <marcel@...tmann.org>, 
 Luiz Augusto von Dentz <luiz.dentz@...il.com>, 
 "David S. Miller" <davem@...emloft.net>, Eric Dumazet <edumazet@...gle.com>, 
 Jakub Kicinski <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>, 
 Balakrishna Godavarthi <quic_bgodavar@...cinc.com>, 
 Rocky Liao <quic_rjliao@...cinc.com>, Kalle Valo <kvalo@...nel.org>, 
 Jeff Johnson <jjohnson@...nel.org>, Bjorn Andersson <andersson@...nel.org>, 
 Konrad Dybcio <konrad.dybcio@...aro.org>, 
 Bartosz Golaszewski <brgl@...ev.pl>, Bjorn Helgaas <bhelgaas@...gle.com>, 
 Srini Kandagatla <srinivas.kandagatla@...aro.org>, 
 Elliot Berman <quic_eberman@...cinc.com>, 
 Caleb Connolly <caleb.connolly@...aro.org>, 
 Neil Armstrong <neil.armstrong@...aro.org>, 
 Dmitry Baryshkov <dmitry.baryshkov@...aro.org>, 
 Alex Elder <elder@...nel.org>
Cc: linux-arm-msm@...r.kernel.org, linux-kernel@...r.kernel.org, 
 devicetree@...r.kernel.org, linux-bluetooth@...r.kernel.org, 
 netdev@...r.kernel.org, linux-wireless@...r.kernel.org, 
 ath11k@...ts.infradead.org, Jeff Johnson <quic_jjohnson@...cinc.com>, 
 ath12k@...ts.infradead.org, linux-pm@...r.kernel.org, 
 linux-pci@...r.kernel.org, 
 Bartosz Golaszewski <bartosz.golaszewski@...aro.org>, kernel@...cinc.com, 
 Amit Pundir <amit.pundir@...aro.org>
Subject: [PATCH v8 12/17] PCI: hold the rescan mutex when scanning for the
 first time

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

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

Tested-by: Amit Pundir <amit.pundir@...aro.org>
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 8e696e547565..604fc96b1098 100644
--- a/drivers/pci/probe.c
+++ b/drivers/pci/probe.c
@@ -3072,7 +3072,9 @@ 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;

-- 
2.43.0