linux-kernel - Re: [RESEND PATCH net v4 1/2] soc: fsl: qbman: Always disable interrupts when taking cgr

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Date: Mon, 19 Feb 2024 17:30:16 +0200
From: Vladimir Oltean <vladimir.oltean@....com>
To: Sean Anderson <sean.anderson@...o.com>, Arnd Bergmann <arnd@...db.de>
Cc: "David S . Miller" <davem@...emloft.net>,
	Eric Dumazet <edumazet@...gle.com>,
	Jakub Kicinski <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>,
	netdev@...r.kernel.org, linuxppc-dev@...ts.ozlabs.org,
	Steffen Trumtrar <s.trumtrar@...gutronix.de>,
	linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
	Roy Pledge <roy.pledge@....com>,
	Camelia Groza <camelia.groza@....com>,
	Claudiu Manoil <claudiu.manoil@....com>,
	Scott Wood <oss@...error.net>, stable@...r.kernel.org
Subject: Re: [RESEND PATCH net v4 1/2] soc: fsl: qbman: Always disable
 interrupts when taking cgr_lock

Hi Sean,

On Thu, Feb 15, 2024 at 11:23:26AM -0500, Sean Anderson wrote:
> smp_call_function_single disables IRQs when executing the callback. To
> prevent deadlocks, we must disable IRQs when taking cgr_lock elsewhere.
> This is already done by qman_update_cgr and qman_delete_cgr; fix the
> other lockers.
> 
> Fixes: 96f413f47677 ("soc/fsl/qbman: fix issue in qman_delete_cgr_safe()")
> CC: stable@...r.kernel.org
> Signed-off-by: Sean Anderson <sean.anderson@...o.com>
> Reviewed-by: Camelia Groza <camelia.groza@....com>
> Tested-by: Vladimir Oltean <vladimir.oltean@....com>
> ---
> I got no response the first time I sent this, so I am resending to net.
> This issue was introduced in a series which went through net, so I hope
> it makes sense to take it via net.
> 
> [1] https://lore.kernel.org/linux-arm-kernel/20240108161904.2865093-1-sean.anderson@seco.com/
> 
> (no changes since v3)
> 
> Changes in v3:
> - Change blamed commit to something more appropriate
> 
> Changes in v2:
> - Fix one additional call to spin_unlock

Leo Li (Li Yang) is no longer with NXP. Until we figure out within NXP
how to continue with the maintainership of drivers/soc/fsl/, yes, please
continue to submit this series to 'net'. I would also like to point
out to Arnd that this is the case.

Arnd, a large portion of drivers/soc/fsl/ is networking-related
(dpio, qbman). Would it make sense to transfer the maintainership
of these under the respective networking drivers, to simplify the
procedures?

Also, your patches are whitespace-damaged. They do not apply to the
kernel, and patchwork shows this as well.
https://patchwork.kernel.org/project/netdevbpf/patch/20240215162327.3663092-1-sean.anderson@seco.com/

Please repost with this fixed.