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

Bartosz Golaszewski
2024-01-04T13:02:10Z

From: Bartosz Golaszewski <bartosz.golaszewski@linaro.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@linaro.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