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r8169: fix LED-related deadlock on module removal

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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: 18764b883e ("r8169: add support for LED's on RTL8168/RTL8101")
Cc: stable@vger.kernel.org
Reported-by: Lukas Wunner <lukas@wunner.de>
Signed-off-by: Heiner Kallweit <hkallweit1@gmail.com>
Reviewed-by: Andrew Lunn <andrew@lunn.ch>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Heiner Kallweit 2024-04-08 20:47:40 +02:00 committed by David S. Miller
parent 81665adf25
commit 19fa4f2a85
3 changed files with 33 additions and 16 deletions
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6
drivers/net/ethernet/realtek/r8169.h
View File

@ -73,6 +73,7 @@ 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);
@ -84,7 +85,8 @@ 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);
int rtl8125_get_led_mode(struct rtl8169_private *tp, int index);
int rtl8125_set_led_mode(struct rtl8169_private *tp, int index, u16 mode);
void rtl8125_init_leds(struct net_device *ndev);
struct r8169_led_classdev *rtl8125_init_leds(struct net_device *ndev);
void r8169_remove_leds(struct r8169_led_classdev *leds);

35
drivers/net/ethernet/realtek/r8169_leds.c
View File

@ -146,22 +146,22 @@ 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;
}
static int rtl8125_led_hw_control_is_supported(struct led_classdev *led_cdev,
@ -245,20 +245,31 @@ static void rtl8125_setup_led_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 rtl8125_init_leds(struct net_device *ndev)
struct r8169_led_classdev *rtl8125_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, RTL8125_NUM_LEDS, sizeof(*leds), GFP_KERNEL);
leds = kcalloc(RTL8125_NUM_LEDS + 1, sizeof(*leds), GFP_KERNEL);
if (!leds)
return;
return NULL;
for (i = 0; i < RTL8125_NUM_LEDS; i++)
rtl8125_setup_led_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);
}

8
drivers/net/ethernet/realtek/r8169_main.c
View File

@ -647,6 +647,8 @@ struct rtl8169_private {
const char *fw_name;
struct rtl_fw *rtl_fw;
struct r8169_led_classdev *leds;
u32 ocp_base;
};
@ -5044,6 +5046,8 @@ static void rtl_remove_one(struct pci_dev *pdev)
cancel_work_sync(&tp->wk.work);
r8169_remove_leds(tp->leds);
unregister_netdev(tp->dev);
if (tp->dash_type != RTL_DASH_NONE)
@ -5501,9 +5505,9 @@ static int rtl_init_one(struct pci_dev *pdev, const struct pci_device_id *ent)
if (IS_ENABLED(CONFIG_R8169_LEDS)) {
if (rtl_is_8125(tp))
rtl8125_init_leds(dev);
tp->leds = rtl8125_init_leds(dev);
else if (tp->mac_version > RTL_GIGA_MAC_VER_06)
rtl8168_init_leds(dev);
tp->leds = rtl8168_init_leds(dev);
}
netdev_info(dev, "%s, %pM, XID %03x, IRQ %d\n",