net: stmmac: ethtool: Fixed calltrace caused by unbalanced disable_irq_wake calls

[ Upstream commit a23aa04042187cbde16f470b49d4ad60d32e9206 ]

We found the following dmesg calltrace when testing the GMAC NIC notebook:

[9.448656] ------------[ cut here ]------------
[9.448658] Unbalanced IRQ 43 wake disable
[9.448673] WARNING: CPU: 3 PID: 1083 at kernel/irq/manage.c:688 irq_set_irq_wake+0xe0/0x128
[9.448717] CPU: 3 PID: 1083 Comm: ethtool Tainted: G           O      4.19 #1
[9.448773]         ...
[9.448774] Call Trace:
[9.448781] [<9000000000209b5c>] show_stack+0x34/0x140
[9.448788] [<9000000000d52700>] dump_stack+0x98/0xd0
[9.448794] [<9000000000228610>] __warn+0xa8/0x120
[9.448797] [<9000000000d2fb60>] report_bug+0x98/0x130
[9.448800] [<900000000020a418>] do_bp+0x248/0x2f0
[9.448805] [<90000000002035f4>] handle_bp_int+0x4c/0x78
[9.448808] [<900000000029ea40>] irq_set_irq_wake+0xe0/0x128
[9.448813] [<9000000000a96a7c>] stmmac_set_wol+0x134/0x150
[9.448819] [<9000000000be6ed0>] dev_ethtool+0x1368/0x2440
[9.448824] [<9000000000c08350>] dev_ioctl+0x1f8/0x3e0
[9.448827] [<9000000000bb2a34>] sock_ioctl+0x2a4/0x450
[9.448832] [<900000000046f044>] do_vfs_ioctl+0xa4/0x738
[9.448834] [<900000000046f778>] ksys_ioctl+0xa0/0xe8
[9.448837] [<900000000046f7d8>] sys_ioctl+0x18/0x28
[9.448840] [<9000000000211ab4>] syscall_common+0x20/0x34
[9.448842] ---[ end trace 40c18d9aec863c3e ]---

Multiple disable_irq_wake() calls will keep decreasing the IRQ
wake_depth, When wake_depth is 0, calling disable_irq_wake() again,
will report the above calltrace.

Due to the need to appear in pairs, we cannot call disable_irq_wake()
without calling enable_irq_wake(). Fix this by making sure there are
no unbalanced disable_irq_wake() calls.

Fixes: 3172d3afa998 ("stmmac: support wake up irq from external sources (v3)")
Signed-off-by: Qiang Ma <maqianga@uniontech.com>
Reviewed-by: Simon Horman <horms@kernel.org>
Link: https://lore.kernel.org/r/20240112021249.24598-1-maqianga@uniontech.com
Signed-off-by: Paolo Abeni <pabeni@redhat.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>

diff --git a/drivers/net/ethernet/stmicro/stmmac/stmmac.h b/drivers/net/ethernet/stmicro/stmmac/stmmac.h
index cd7a976..b8c93b8 100644 (file)
--- a/drivers/net/ethernet/stmicro/stmmac/stmmac.h
+++ b/drivers/net/ethernet/stmicro/stmmac/stmmac.h
@@ -255,6 +255,7 @@ struct stmmac_priv {
        u32 msg_enable;
        int wolopts;
        int wol_irq;
+       bool wol_irq_disabled;
        int clk_csr;
        struct timer_list eee_ctrl_timer;
        int lpi_irq;

diff --git a/drivers/net/ethernet/stmicro/stmmac/stmmac_ethtool.c b/drivers/net/ethernet/stmicro/stmmac/stmmac_ethtool.c
index 419efe4..69c8c25 100644 (file)
--- a/drivers/net/ethernet/stmicro/stmmac/stmmac_ethtool.c
+++ b/drivers/net/ethernet/stmicro/stmmac/stmmac_ethtool.c
@@ -822,10 +822,16 @@ static int stmmac_set_wol(struct net_device *dev, struct ethtool_wolinfo *wol)
        if (wol->wolopts) {
                pr_info("stmmac: wakeup enable\n");
                device_set_wakeup_enable(priv->device, 1);
-               enable_irq_wake(priv->wol_irq);
+               /* Avoid unbalanced enable_irq_wake calls */
+               if (priv->wol_irq_disabled)
+                       enable_irq_wake(priv->wol_irq);
+               priv->wol_irq_disabled = false;
        } else {
                device_set_wakeup_enable(priv->device, 0);
-               disable_irq_wake(priv->wol_irq);
+               /* Avoid unbalanced disable_irq_wake calls */
+               if (!priv->wol_irq_disabled)
+                       disable_irq_wake(priv->wol_irq);
+               priv->wol_irq_disabled = true;
        }
 
        mutex_lock(&priv->lock);

diff --git a/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c b/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
index 69b9c71..1bfcf67 100644 (file)
--- a/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
+++ b/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
@@ -3549,6 +3549,7 @@ static int stmmac_request_irq_multi_msi(struct net_device *dev)
        /* Request the Wake IRQ in case of another line
         * is used for WoL
         */
+       priv->wol_irq_disabled = true;
        if (priv->wol_irq > 0 && priv->wol_irq != dev->irq) {
                int_name = priv->int_name_wol;
                sprintf(int_name, "%s:%s", dev->name, "wol");