Binding devm_led_classdev_register() to the netdev is problematic
because on module removal we get a RTNL-related deadlock. Fix this
by avoiding the device-managed LED functions.
Note: We can safely call led_classdev_unregister() for a LED even
if registering it failed, because led_classdev_unregister() detects
this and is a no-op in this case.
Fixes: 18764b883e15 ("r8169: add support for LED's on RTL8168/RTL8101")
Cc: <stable@xxxxxxxxxxxxxxx> # 6.8.x
Reported-by: Lukas Wunner <lukas@xxxxxxxxx>
Signed-off-by: Heiner Kallweit <hkallweit1@xxxxxxxxx>
---
The original change was introduced with 6.8, 6.9 added support for
LEDs on RTL8125. Therefore the first version of the fix applied on
6.9-rc only. This is the modified version for 6.8.
Upstream commit: 19fa4f2a85d7
---
drivers/net/ethernet/realtek/r8169.h | 4 +++-
drivers/net/ethernet/realtek/r8169_leds.c | 23 +++++++++++++++++------
drivers/net/ethernet/realtek/r8169_main.c | 7 ++++++-
3 files changed, 26 insertions(+), 8 deletions(-)
diff --git a/drivers/net/ethernet/realtek/r8169.h b/drivers/net/ethernet/realtek/r8169.h
index 81567fcf3..1ef399287 100644
--- a/drivers/net/ethernet/realtek/r8169.h
+++ b/drivers/net/ethernet/realtek/r8169.h
@@ -72,6 +72,7 @@ enum mac_version {
};
struct rtl8169_private;
+struct r8169_led_classdev;
void r8169_apply_firmware(struct rtl8169_private *tp);
u16 rtl8168h_2_get_adc_bias_ioffset(struct rtl8169_private *tp);
@@ -83,4 +84,5 @@ void r8169_get_led_name(struct rtl8169_private *tp, int idx,
char *buf, int buf_len);
int rtl8168_get_led_mode(struct rtl8169_private *tp);
int rtl8168_led_mod_ctrl(struct rtl8169_private *tp, u16 mask, u16 val);
-void rtl8168_init_leds(struct net_device *ndev);
+struct r8169_led_classdev *rtl8168_init_leds(struct net_device *ndev);
+void r8169_remove_leds(struct r8169_led_classdev *leds);
diff --git a/drivers/net/ethernet/realtek/r8169_leds.c b/drivers/net/ethernet/realtek/r8169_leds.c
index 007d077ed..1c97f3cca 100644
--- a/drivers/net/ethernet/realtek/r8169_leds.c
+++ b/drivers/net/ethernet/realtek/r8169_leds.c
@@ -138,20 +138,31 @@ static void rtl8168_setup_ldev(struct r8169_led_classdev *ldev,
led_cdev->hw_control_get_device = r8169_led_hw_control_get_device;
/* ignore errors */
- devm_led_classdev_register(&ndev->dev, led_cdev);
+ led_classdev_register(&ndev->dev, led_cdev);
}
-void rtl8168_init_leds(struct net_device *ndev)
+struct r8169_led_classdev *rtl8168_init_leds(struct net_device *ndev)
{
- /* bind resource mgmt to netdev */
- struct device *dev = &ndev->dev;
struct r8169_led_classdev *leds;
int i;
- leds = devm_kcalloc(dev, RTL8168_NUM_LEDS, sizeof(*leds), GFP_KERNEL);
+ leds = kcalloc(RTL8168_NUM_LEDS + 1, sizeof(*leds), GFP_KERNEL);
if (!leds)
- return;
+ return NULL;
for (i = 0; i < RTL8168_NUM_LEDS; i++)
rtl8168_setup_ldev(leds + i, ndev, i);
+
+ return leds;
+}
+
+void r8169_remove_leds(struct r8169_led_classdev *leds)
+{
+ if (!leds)
+ return;
+
+ for (struct r8169_led_classdev *l = leds; l->ndev; l++)
+ led_classdev_unregister(&l->led);
+
+ kfree(leds);
}
diff --git a/drivers/net/ethernet/realtek/r8169_main.c b/drivers/net/ethernet/realtek/r8169_main.c
index 4b6c28576..32b73f398 100644
--- a/drivers/net/ethernet/realtek/r8169_main.c
+++ b/drivers/net/ethernet/realtek/r8169_main.c
@@ -634,6 +634,8 @@ struct rtl8169_private {
const char *fw_name;
struct rtl_fw *rtl_fw;
+ struct r8169_led_classdev *leds;
+
u32 ocp_base;
};
@@ -4930,6 +4932,9 @@ static void rtl_remove_one(struct pci_dev *pdev)
cancel_work_sync(&tp->wk.work);
+ if (IS_ENABLED(CONFIG_R8169_LEDS))
+ r8169_remove_leds(tp->leds);
+
unregister_netdev(tp->dev);
if (tp->dash_type != RTL_DASH_NONE)
@@ -5391,7 +5396,7 @@ static int rtl_init_one(struct pci_dev *pdev, const struct pci_device_id *ent)
if (IS_ENABLED(CONFIG_R8169_LEDS) &&
tp->mac_version > RTL_GIGA_MAC_VER_06 &&
tp->mac_version < RTL_GIGA_MAC_VER_61)
- rtl8168_init_leds(dev);
+ tp->leds = rtl8168_init_leds(dev);
netdev_info(dev, "%s, %pM, XID %03x, IRQ %d\n",
rtl_chip_infos[chipset].name, dev->dev_addr, xid, tp->irq);
--
2.44.0
