[PATCH v2] driver core: Check drivers_autoprobe for all added devices

[Vincent Liu]

When a device is hot-plugged, the drivers_autoprobe sysfs attribute is
not checked. This means that drivers_autoprobe is not working as
intended, e.g. hot-plugged PCIe devices will still be autoprobed and
bound to drivers even with drivers_autoprobe disabled.

Make sure all devices check drivers_autoprobe by pushing the
drivers_autoprobe check into device_initial_probe. This will only
affect devices on the PCI bus for now as device_initial_probe is only
called by pci_bus_add_device and bus_probe_device (but bus_probe_device
already checks for autoprobe). In particular for the PCI devices, only
hot-plugged PCIe devices/VFs should be affected as the default value of
pci/drivers_autoprobe remains 1 and can only be cleared from userland.

Any future callers of device_initial_probe will respsect the
drivers_autoprobe sysfs attribute, but this should be the intended
purpose of drivers_autoprobe.

Signed-off-by: Vincent Liu <vincent.liu@xxxxxxxxxxx>
---
v1->v2: Change commit subject to include driver core (no code change)
	https://lore.kernel.org/20251001151508.1684592-1-vincent.liu@xxxxxxxxxxx
---
 drivers/base/bus.c |  3 +--
 drivers/base/dd.c  | 10 +++++++++-
 2 files changed, 10 insertions(+), 3 deletions(-)

diff --git a/drivers/base/bus.c b/drivers/base/bus.c
index 5e75e1bce551..320e155c6be7 100644
--- a/drivers/base/bus.c
+++ b/drivers/base/bus.c
@@ -533,8 +533,7 @@ void bus_probe_device(struct device *dev)
 	if (!sp)
 		return;
 
-	if (sp->drivers_autoprobe)
-		device_initial_probe(dev);
+	device_initial_probe(dev);
 
 	mutex_lock(&sp->mutex);
 	list_for_each_entry(sif, &sp->interfaces, node)
diff --git a/drivers/base/dd.c b/drivers/base/dd.c
index 13ab98e033ea..37fc57e44e54 100644
--- a/drivers/base/dd.c
+++ b/drivers/base/dd.c
@@ -1077,7 +1077,15 @@ EXPORT_SYMBOL_GPL(device_attach);
 
 void device_initial_probe(struct device *dev)
 {
-	__device_attach(dev, true);
+	struct subsys_private *sp = bus_to_subsys(dev->bus);
+
+	if (!sp)
+		return;
+
+	if (sp->drivers_autoprobe)
+		__device_attach(dev, true);
+
+	subsys_put(sp);
 }
 
 /*
-- 
2.43.7