netdev - Re: [PATCH] net: atlantic: always deep reset on pm op, fixing null deref regression

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Message-ID: <05b077d6-95a7-60d6-94ad-b44dbe7cd5e4@applied-asynchrony.com>
Date:   Thu, 5 May 2022 00:24:32 +0200
From:   Holger Hoffstätte <holger@...lied-asynchrony.com>
To:     Manuel Ullmann <labre@...teo.de>,
        Igor Russkikh <irusskikh@...vell.com>
Cc:     linux-kernel@...r.kernel.org, netdev@...r.kernel.org,
        regressions@...ts.linux.dev, davem@...emloft.net,
        ndanilov@...vell.com, kuba@...nel.org, pabeni@...hat.com,
        Jordan Leppert <jordanleppert@...tonmail.com>,
        koo5 <kolman.jindrich@...il.com>
Subject: Re: [PATCH] net: atlantic: always deep reset on pm op, fixing null
 deref regression

On 2022-05-05 00:06, Manuel Ullmann wrote:
>  From a3eccd32c618fe4b4f5c537cd83ba5611149623e Mon Sep 17 00:00:00 2001
> Date: Wed, 4 May 2022 21:30:44 +0200
> 
> The impact of this regression is the same for resume that I saw on
> thaw: the kernel hangs and nothing except SysRq rebooting can be done.
> 
> The null deref occurs at the same position as on thaw.
> BUG: kernel NULL pointer dereference
> RIP: aq_ring_rx_fill+0xcf/0x210 [atlantic]
> 
> Fixes regression in cbe6c3a8f8f4 ("net: atlantic: invert deep par in
> pm functions, preventing null derefs"), where I disabled deep pm
> resets in suspend and resume, trying to make sense of the
> atl_resume_common deep parameter in the first place.
> 
> It turns out, that atlantic always has to deep reset on pm operations
> and the parameter is useless. Even though I expected that and tested
> resume, I screwed up by kexec-rebooting into an unpatched kernel, thus
> missing the breakage.
> 
> This fixup obsoletes the deep parameter of atl_resume_common, but I
> leave the cleanup for the maintainers to post to mainline.
> 
> PS: I'm very sorry for this regression.
> 
> Fixes: cbe6c3a8f8f4315b96e46e1a1c70393c06d95a4c
> Link: https://lore.kernel.org/regressions/9-Ehc_xXSwdXcvZqKD5aSqsqeNj5Izco4MYEwnx5cySXVEc9-x_WC4C3kAoCqNTi-H38frroUK17iobNVnkLtW36V6VWGSQEOHXhmVMm5iQ=@protonmail.com/
> Reported-by: Jordan Leppert <jordanleppert@...tonmail.com>
> Reported-by: Holger Hoffstätte <holger@...lied-asynchrony.com>
> CC: <stable@...r.kernel.org> # 5.17.5
> CC: <stable@...r.kernel.org> # 5.15.36
> CC: <stable@...r.kernel.org> # 5.10.113
> Signed-off-by: Manuel ULlmann <labre@...teo.de>
> ---
>   drivers/net/ethernet/aquantia/atlantic/aq_pci_func.c | 4 ++--
>   1 file changed, 2 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/net/ethernet/aquantia/atlantic/aq_pci_func.c b/drivers/net/ethernet/aquantia/atlantic/aq_pci_func.c
> index 3a529ee8c834..831833911a52 100644
> --- a/drivers/net/ethernet/aquantia/atlantic/aq_pci_func.c
> +++ b/drivers/net/ethernet/aquantia/atlantic/aq_pci_func.c
> @@ -449,7 +449,7 @@ static int aq_pm_freeze(struct device *dev)
>   
>   static int aq_pm_suspend_poweroff(struct device *dev)
>   {
> -	return aq_suspend_common(dev, false);
> +	return aq_suspend_common(dev, true);
>   }
>   
>   static int aq_pm_thaw(struct device *dev)
> @@ -459,7 +459,7 @@ static int aq_pm_thaw(struct device *dev)
>   
>   static int aq_pm_resume_restore(struct device *dev)
>   {
> -	return atl_resume_common(dev, false);
> +	return atl_resume_common(dev, true);
>   }
>   
>   static const struct dev_pm_ops aq_pm_ops = {
> 
> base-commit: 672c0c5173427e6b3e2a9bbb7be51ceeec78093a
> 

As mentioned in the discusson thread this reliably restores resume
for me, so:

Tested-by: Holger Hoffstätte <holger@...lied-asynchrony.com>

Thanks!
Holger