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148 lines
4.7 KiB
Diff
148 lines
4.7 KiB
Diff
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From 19fa4f2a85d777a8052e869c1b892a2f7556569d Mon Sep 17 00:00:00 2001
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From: Heiner Kallweit <hkallweit1@gmail.com>
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Date: Mon, 8 Apr 2024 20:47:40 +0200
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Subject: [PATCH] r8169: fix LED-related deadlock on module removal
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Binding devm_led_classdev_register() to the netdev is problematic
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because on module removal we get a RTNL-related deadlock. Fix this
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by avoiding the device-managed LED functions.
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Note: We can safely call led_classdev_unregister() for a LED even
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if registering it failed, because led_classdev_unregister() detects
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this and is a no-op in this case.
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Fixes: 18764b883e15 ("r8169: add support for LED's on RTL8168/RTL8101")
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Cc: stable@vger.kernel.org
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Reported-by: Lukas Wunner <lukas@wunner.de>
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Signed-off-by: Heiner Kallweit <hkallweit1@gmail.com>
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Reviewed-by: Andrew Lunn <andrew@lunn.ch>
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Signed-off-by: David S. Miller <davem@davemloft.net>
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---
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drivers/net/ethernet/realtek/r8169.h | 6 ++--
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drivers/net/ethernet/realtek/r8169_leds.c | 35 +++++++++++++++--------
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drivers/net/ethernet/realtek/r8169_main.c | 8 ++++--
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3 files changed, 33 insertions(+), 16 deletions(-)
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--- a/drivers/net/ethernet/realtek/r8169.h
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+++ b/drivers/net/ethernet/realtek/r8169.h
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@@ -73,6 +73,7 @@ enum mac_version {
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};
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struct rtl8169_private;
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+struct r8169_led_classdev;
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void r8169_apply_firmware(struct rtl8169_private *tp);
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u16 rtl8168h_2_get_adc_bias_ioffset(struct rtl8169_private *tp);
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@@ -84,7 +85,8 @@ void r8169_get_led_name(struct rtl8169_p
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char *buf, int buf_len);
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int rtl8168_get_led_mode(struct rtl8169_private *tp);
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int rtl8168_led_mod_ctrl(struct rtl8169_private *tp, u16 mask, u16 val);
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-void rtl8168_init_leds(struct net_device *ndev);
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+struct r8169_led_classdev *rtl8168_init_leds(struct net_device *ndev);
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int rtl8125_get_led_mode(struct rtl8169_private *tp, int index);
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int rtl8125_set_led_mode(struct rtl8169_private *tp, int index, u16 mode);
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-void rtl8125_init_leds(struct net_device *ndev);
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+struct r8169_led_classdev *rtl8125_init_leds(struct net_device *ndev);
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+void r8169_remove_leds(struct r8169_led_classdev *leds);
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--- a/drivers/net/ethernet/realtek/r8169_leds.c
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+++ b/drivers/net/ethernet/realtek/r8169_leds.c
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@@ -147,22 +147,22 @@ static void rtl8168_setup_ldev(struct r8
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led_cdev->hw_control_get_device = r8169_led_hw_control_get_device;
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/* ignore errors */
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- devm_led_classdev_register(&ndev->dev, led_cdev);
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+ led_classdev_register(&ndev->dev, led_cdev);
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}
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-void rtl8168_init_leds(struct net_device *ndev)
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+struct r8169_led_classdev *rtl8168_init_leds(struct net_device *ndev)
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{
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- /* bind resource mgmt to netdev */
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- struct device *dev = &ndev->dev;
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struct r8169_led_classdev *leds;
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int i;
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- leds = devm_kcalloc(dev, RTL8168_NUM_LEDS, sizeof(*leds), GFP_KERNEL);
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+ leds = kcalloc(RTL8168_NUM_LEDS + 1, sizeof(*leds), GFP_KERNEL);
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if (!leds)
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- return;
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+ return NULL;
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for (i = 0; i < RTL8168_NUM_LEDS; i++)
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rtl8168_setup_ldev(leds + i, ndev, i);
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+
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+ return leds;
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}
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static int rtl8125_led_hw_control_is_supported(struct led_classdev *led_cdev,
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@@ -246,20 +246,31 @@ static void rtl8125_setup_led_ldev(struc
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led_cdev->hw_control_get_device = r8169_led_hw_control_get_device;
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/* ignore errors */
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- devm_led_classdev_register(&ndev->dev, led_cdev);
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+ led_classdev_register(&ndev->dev, led_cdev);
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}
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-void rtl8125_init_leds(struct net_device *ndev)
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+struct r8169_led_classdev *rtl8125_init_leds(struct net_device *ndev)
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{
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- /* bind resource mgmt to netdev */
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- struct device *dev = &ndev->dev;
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struct r8169_led_classdev *leds;
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int i;
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- leds = devm_kcalloc(dev, RTL8125_NUM_LEDS, sizeof(*leds), GFP_KERNEL);
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+ leds = kcalloc(RTL8125_NUM_LEDS + 1, sizeof(*leds), GFP_KERNEL);
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if (!leds)
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- return;
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+ return NULL;
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for (i = 0; i < RTL8125_NUM_LEDS; i++)
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rtl8125_setup_led_ldev(leds + i, ndev, i);
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+
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+ return leds;
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+}
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+
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+void r8169_remove_leds(struct r8169_led_classdev *leds)
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+{
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+ if (!leds)
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+ return;
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+
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+ for (struct r8169_led_classdev *l = leds; l->ndev; l++)
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+ led_classdev_unregister(&l->led);
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+
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+ kfree(leds);
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}
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--- a/drivers/net/ethernet/realtek/r8169_main.c
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+++ b/drivers/net/ethernet/realtek/r8169_main.c
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@@ -651,6 +651,8 @@ struct rtl8169_private {
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const char *fw_name;
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struct rtl_fw *rtl_fw;
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+ struct r8169_led_classdev *leds;
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+
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u32 ocp_base;
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};
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@@ -5126,6 +5128,8 @@ static void rtl_remove_one(struct pci_de
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cancel_work_sync(&tp->wk.work);
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+ r8169_remove_leds(tp->leds);
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+
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unregister_netdev(tp->dev);
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if (tp->dash_type != RTL_DASH_NONE)
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@@ -5586,9 +5590,9 @@ static int rtl_init_one(struct pci_dev *
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if (IS_ENABLED(CONFIG_R8169_LEDS)) {
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if (rtl_is_8125(tp))
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- rtl8125_init_leds(dev);
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+ tp->leds = rtl8125_init_leds(dev);
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else if (tp->mac_version > RTL_GIGA_MAC_VER_06)
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- rtl8168_init_leds(dev);
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+ tp->leds = rtl8168_init_leds(dev);
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}
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netdev_info(dev, "%s, %pM, XID %03x, IRQ %d\n",
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