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Message-ID: <20230916154737.GG1125562@kernel.org>
Date: Sat, 16 Sep 2023 17:47:37 +0200
From: Simon Horman <horms@...nel.org>
To: Jisheng Zhang <jszhang@...nel.org>
Cc: Giuseppe Cavallaro <peppe.cavallaro@...com>,
Alexandre Torgue <alexandre.torgue@...s.st.com>,
Jose Abreu <joabreu@...opsys.com>,
"David S . Miller" <davem@...emloft.net>,
Eric Dumazet <edumazet@...gle.com>,
Jakub Kicinski <kuba@...nel.org>,
Paolo Abeni <pabeni@...hat.com>,
Maxime Coquelin <mcoquelin.stm32@...il.com>,
Chen-Yu Tsai <wens@...e.org>,
Jernej Skrabec <jernej.skrabec@...il.com>,
Samuel Holland <samuel@...lland.org>, netdev@...r.kernel.org,
linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
linux-sunxi@...ts.linux.dev,
linux-stm32@...md-mailman.stormreply.com,
johannes@...solutions.net,
Uwe Kleine-König
<u.kleine-koenig@...gutronix.de>
Subject: Re: [PATCH] net: stmmac: fix incorrect rxq|txq_stats reference
On Fri, Sep 15, 2023 at 08:53:16AM +0800, Jisheng Zhang wrote:
> commit 133466c3bbe1 ("net: stmmac: use per-queue 64 bit statistics
> where necessary") caused one regression as found by Uwe, the backtrace
> looks like:
>
> INFO: trying to register non-static key.
> The code is fine but needs lockdep annotation, or maybe
> you didn't initialize this object before use?
> turning off the locking correctness validator.
> CPU: 0 PID: 1 Comm: swapper/0 Not tainted 6.5.0-rc1-00449-g133466c3bbe1-dirty #21
> Hardware name: STM32 (Device Tree Support)
> unwind_backtrace from show_stack+0x18/0x1c
> show_stack from dump_stack_lvl+0x60/0x90
> dump_stack_lvl from register_lock_class+0x98c/0x99c
> register_lock_class from __lock_acquire+0x74/0x293c
> __lock_acquire from lock_acquire+0x134/0x398
> lock_acquire from stmmac_get_stats64+0x2ac/0x2fc
> stmmac_get_stats64 from dev_get_stats+0x44/0x130
> dev_get_stats from rtnl_fill_stats+0x38/0x120
> rtnl_fill_stats from rtnl_fill_ifinfo+0x834/0x17f4
> rtnl_fill_ifinfo from rtmsg_ifinfo_build_skb+0xc0/0x144
> rtmsg_ifinfo_build_skb from rtmsg_ifinfo+0x50/0x88
> rtmsg_ifinfo from __dev_notify_flags+0xc0/0xec
> __dev_notify_flags from dev_change_flags+0x50/0x5c
> dev_change_flags from ip_auto_config+0x2f4/0x1260
> ip_auto_config from do_one_initcall+0x70/0x35c
> do_one_initcall from kernel_init_freeable+0x2ac/0x308
> kernel_init_freeable from kernel_init+0x1c/0x138
> kernel_init from ret_from_fork+0x14/0x2c
>
> The reason is the rxq|txq_stats structures are not what expected
> because stmmac_open() -> __stmmac_open() the structure is overwritten
> by "memcpy(&priv->dma_conf, dma_conf, sizeof(*dma_conf));"
> This causes the well initialized syncp member of rxq|txq_stats is
> overwritten unexpectedly as pointed out by Johannes and Uwe.
>
> Fix this issue by moving rxq|txq_stats back to stmmac_extra_stats. For
> SMP cache friendly, we also mark stmmac_txq_stats and stmmac_rxq_stats
> as ____cacheline_aligned_in_smp.
>
> Fixes: 133466c3bbe1 ("net: stmmac: use per-queue 64 bit statistics where necessary")
> Signed-off-by: Jisheng Zhang <jszhang@...nel.org>
> Reported-by: Uwe Kleine-König <u.kleine-koenig@...gutronix.de>
Hi Jisheng Zhang,
as a fix for Networking code this should be based targeted at the net tree.
Subject: [PATCH net] ...
Unfortunately it doesn't apply cleanly against net.
Please consider rebasing and reposting.
--
pw-bot: changes-requested
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