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Message-ID: <8553142D466DD03F+20240116135734.53fb4c6e@john-PC>
Date: Tue, 16 Jan 2024 13:57:34 +0800
From: Qiang Ma <maqianga@...ontech.com>
To: Simon Horman <horms@...nel.org>, alexandre.torgue@...s.st.com,
joabreu@...opsys.com, davem@...emloft.net, edumazet@...gle.com,
kuba@...nel.org, pabeni@...hat.com, mcoquelin.stm32@...il.com, Florian
Fainelli <f.fainelli@...il.com>
Cc: netdev@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
linux-kernel@...r.kernel.org
Subject: Re: [PATCH] net: stmmac: ethtool: Fixed calltrace caused by
unbalanced disable_irq_wake calls
On Mon, 15 Jan 2024 13:42:38 +0000
Simon Horman <horms@...nel.org> wrote:
> + Florian Fainelli <f.fainelli@...il.com>
>
> On Fri, Jan 12, 2024 at 10:12:49AM +0800, Qiang Ma wrote:
> > 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.
>
>
> Hi Qiang Ma,
>
> This seems to be a fix, so I think it should be targeted at net:
>
> Subject: [PATCH net] ...
>
> And have a fixes tag, perhaps:
>
> Fixes: 3172d3afa998 ("stmmac: support wake up irq from
> external sources (v3)")
>
> I don't think there is a need to repost this patch because of the
> above, but please keep it in mind for next time.
>
> > Signed-off-by: Qiang Ma <maqianga@...ontech.com>
>
> I see that the approach taken here is the same as that taken
> by bcm_sysport_set_wol() to what seems to be a similar problem [1].
> So the code change itself looks good to me.
>
> Reviewed-by: Simon Horman <horms@...nel.org>
>
> [1] 61b423a8a0bd ("net: systemport: avoid unbalanced enable_irq_wake
> calls") https://git.kernel.org/torvalds/c/61b423a8a0bd
>
> > ---
> > drivers/net/ethernet/stmicro/stmmac/stmmac.h | 1 +
> > drivers/net/ethernet/stmicro/stmmac/stmmac_ethtool.c | 10
> > ++++++++-- drivers/net/ethernet/stmicro/stmmac/stmmac_main.c |
> > 1 + 3 files changed, 10 insertions(+), 2 deletions(-)
> >
> > diff --git a/drivers/net/ethernet/stmicro/stmmac/stmmac.h
> > b/drivers/net/ethernet/stmicro/stmmac/stmmac.h index
> > cd7a9768de5f..b8c93b881a65 100644 ---
> > 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
> > f628411ae4ae..9a4d9492a781 100644 ---
> > a/drivers/net/ethernet/stmicro/stmmac/stmmac_ethtool.c +++
> > b/drivers/net/ethernet/stmicro/stmmac/stmmac_ethtool.c @@ -825,10
> > +825,16 @@ 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
> > 37e64283f910..baa396621ed8 100644 ---
> > a/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c +++
> > b/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c @@ -3565,6
> > +3565,7 @@ 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");
> > --
> > 2.20.1
> >
>
Hi Simon Horman,
The latest code does not seem to see the stmmac driver to avoid
irq_wake call related fix committed, this fix is mainly for stmmac,
refer to the commit:
commit 61b423a8a0bd9aeaa046f9a24bed42e3a953a936 Author:
Florian Fainelli <f.fainelli@...il.com> Date: Fri Oct 10 10:51:54
2014 -0700
net: systemport: avoid unbalanced enable_irq_wake calls
commit 083731a8fbe71d83fc908adf137dc98ee352f280
Author: Florian Fainelli <f.fainelli@...il.com>
Date: Fri Oct 10 10:51:53 2014 -0700
net: bcmgenet: avoid unbalanced enable_irq_wake calls
Therefore, I think this submission is necessary at this time.
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