PCI/NPEM: Set LED_HW_PLUGGABLE for hotplug-capable ports

[ Upstream commit 16d021c ]

NPEM registers LED classdevs on PCI endpoint that may be behind
hotplug-capable ports. During hot-removal, led_classdev_unregister() calls
led_set_brightness(LED_OFF) which leads to a PCI config read to a
disconnected device, which fails and returns -ENODEV (topology details in
msgid.link below):

  leds 0003:01:00.0:enclosure:ok: Setting an LED's brightness failed (-19)

The LED core already suppresses this for devices with LED_HW_PLUGGABLE set,
but NPEM never sets it. Add the flag since NPEM LEDs are on hot-pluggable
hardware by nature.

Fixes: 4e89354 ("PCI/NPEM: Add Native PCIe Enclosure Management support")
Signed-off-by: Richard Cheng <icheng@nvidia.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Reviewed-by: Lukas Wunner <lukas@wunner.de>
Acked-by: Kai-Heng Feng <kaihengf@nvidia.com>
Link: https://patch.msgid.link/20260402093850.23075-1-icheng@nvidia.com
Signed-off-by: Sasha Levin <sashal@kernel.org>

Author: nvax-r

drivers/pci/npem.c

@@ -504,7 +504,7 @@ static int pci_npem_set_led_classdev(struct npem *npem, struct npem_led *nled)
 	led->brightness_get = brightness_get;
 	led->max_brightness = 1;
 	led->default_trigger = "none";
-	led->flags = 0;
+	led->flags = LED_HW_PLUGGABLE;
 
 	ret = led_classdev_register(&npem->dev->dev, led);
 	if (ret)