PNP: Fix ISAPNP to generate uevents 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 <[e-mail]>
[ rjw: Subject edits ]
Link: https://patch.msgid.link/[e-mail]
Signed-off-by: Rafael J. Wysocki <[e-mail]>

drivers/pnp/driver.c

···
 		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);
···
 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,