linux-kernel - [PATCH] PCI: Check drivers_autoprobe for all added devices

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Message-ID: <20251001151508.1684592-1-vincent.liu@nutanix.com>
Date: Wed,  1 Oct 2025 16:15:07 +0100
From: Vincent Liu <vincent.liu@...anix.com>
To: Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        "Rafael J. Wysocki" <rafael@...nel.org>,
        Danilo Krummrich <dakr@...nel.org>, linux-kernel@...r.kernel.org
Cc: Vincent Liu <vincent.liu@...anix.com>
Subject: [PATCH] PCI: Check drivers_autoprobe for all added devices

When a PCIe device is hot-plugged, or when a VF is created, the
drivers_autoprobe sysfs attribute is not checked. This means that
drivers_autoprobe is not working as intended, e.g. hot-plugged 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 should only
affect devices on the PCI bus as device_initial_probe is only called by
pci_bus_add_device (bus_probe_device already checks for autoprobe).
In particular, 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.

Signed-off-by: Vincent Liu <vincent.liu@...anix.com>
---
 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