linux-kernel - [PATCH] PNP: Fix ISAPNP to generetae uevent to auto-load modules

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Message-Id: <20251118.145942.1445519082574147037.rene@exactco.de>
Date: Tue, 18 Nov 2025 14:59:42 +0100 (CET)
From: René Rebe <rene@...ctco.de>
To: linux-acpi@...r.kernel.org, linux-kernel@...r.kernel.org
Cc: "Rafael J. Wysocki" <rafael@...nel.org>
Subject: [PATCH] PNP: Fix ISAPNP to generetae uevent to auto-load modules

Currently ISAPNP devices do not generate an uevent for udev to
auto-load the driver modules for Creative SoundBlaster or Gravis
UltraSound to just work.

Signed-off-by: René Rebe <rene@...ctco.de>
---
Tested for a while in T2/Linux already.
---
 drivers/pnp/driver.c | 19 +++++++++++++++++++
 1 file changed, 19 insertions(+)

diff --git a/drivers/pnp/driver.c b/drivers/pnp/driver.c
index 7de7aabb275e..05e9840bc3d4 100644
--- a/drivers/pnp/driver.c
+++ b/drivers/pnp/driver.c
@@ -150,6 +150,24 @@ static void pnp_device_shutdown(struct device *dev)
 		drv->shutdown(pnp_dev);
 }
 
+static int pnp_uevent(const struct device *dev, struct kobj_uevent_env *env)
+{
+	struct pnp_id *pos;
+	const struct pnp_dev *pnp_dev = to_pnp_dev(dev);
+
+	if (!dev)
+		return -ENODEV;
+
+	pos = pnp_dev->id;
+	while (pos) {
+		if (add_uevent_var(env, "MODALIAS=pnp:d%s", pos->id))
+			return -ENOMEM;
+		pos = pos->next;
+	}
+
+	return 0;
+}
+
 static int pnp_bus_match(struct device *dev, const struct device_driver *drv)
 {
 	struct pnp_dev *pnp_dev = to_pnp_dev(dev);
@@ -259,6 +277,7 @@ static const struct dev_pm_ops pnp_bus_dev_pm_ops = {
 const struct bus_type pnp_bus_type = {
 	.name    = "pnp",
 	.match   = pnp_bus_match,
+	.uevent  = pnp_uevent,
 	.probe   = pnp_device_probe,
 	.remove  = pnp_device_remove,
 	.shutdown = pnp_device_shutdown,
-- 
2.46.0

-- 
René Rebe, ExactCODE GmbH, Berlin, Germany
https://exactco.de • https://t2linux.com • https://patreon.com/renerebe