linux-kernel - Re: [PATCH v2 2/2] soc: fsl: qbman: Use raw spinlock for cgr

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Date:   Mon, 3 Apr 2023 17:06:11 +0300
From:   Vladimir Oltean <vladimir.oltean@....com>
To:     Sean Anderson <sean.anderson@...o.com>
Cc:     Li Yang <leoyang.li@....com>, linuxppc-dev@...ts.ozlabs.org,
        linux-arm-kernel@...ts.infradead.org,
        Scott Wood <oss@...error.net>,
        Camelia Groza <camelia.groza@....com>,
        linux-kernel@...r.kernel.org, Roy Pledge <roy.pledge@....com>,
        "David S . Miller" <davem@...emloft.net>,
        Claudiu Manoil <claudiu.manoil@....com>
Subject: Re: [PATCH v2 2/2] soc: fsl: qbman: Use raw spinlock for cgr_lock

On Fri, Mar 31, 2023 at 11:14:13AM -0400, Sean Anderson wrote:
> cgr_lock may be locked with interrupts already disabled by
> smp_call_function_single. As such, we must use a raw spinlock to avoid
> problems on PREEMPT_RT kernels. Although this bug has existed for a
> while, it was not apparent until commit ef2a8d5478b9 ("net: dpaa: Adjust
> queue depth on rate change") which invokes smp_call_function_single via
> qman_update_cgr_safe every time a link goes up or down.
> 
> Fixes: c535e923bb97 ("soc/fsl: Introduce DPAA 1.x QMan device driver")

Same comment about the Fixes tag.

git tag --contains c535e923bb97
v4.9
git tag --contains 96f413f47677
v4.16

Looking at https://www.kernel.org/, I see that kernel 4.14 is still
maintained but should not have this patch backported, do you agree?

> Reported-by: Vladimir Oltean <vladimir.oltean@....com>
> Link: https://lore.kernel.org/all/20230323153935.nofnjucqjqnz34ej@skbuf/
> Signed-off-by: Sean Anderson <sean.anderson@...o.com>
> ---

Anyway,

Tested-by: Vladimir Oltean <vladimir.oltean@....com>