linux-kernel - [PATCH 5.4 3/3] irqdomain: Fix mapping-creation race

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Date:   Tue, 11 Apr 2023 18:22:03 +0800
From:   Mark-PK Tsai <mark-pk.tsai@...iatek.com>
To:     <mark-pk.tsai@...iatek.com>
CC:     <gregkh@...uxfoundation.org>, <johan+linaro@...nel.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        <linux-kernel@...r.kernel.org>,
        <linux-mediatek@...ts.infradead.org>, <matthias.bgg@...il.com>,
        <maz@...nel.org>, <stable@...r.kernel.org>, <tglx@...utronix.de>
Subject: [PATCH 5.4 3/3] irqdomain: Fix mapping-creation race

> From: Johan Hovold <johan+linaro@...nel.org>
> 
> [ Upstream commit 601363cc08da25747feb87c55573dd54de91d66a ]
> 
> Parallel probing of devices that share interrupts (e.g. when a driver
> uses asynchronous probing) can currently result in two mappings for the
> same hardware interrupt to be created due to missing serialisation.
> 
> Make sure to hold the irq_domain_mutex when creating mappings so that
> looking for an existing mapping before creating a new one is done
> atomically.
> 
> Fixes: 765230b5f084 ("driver-core: add asynchronous probing support for drivers")
> Fixes: b62b2cf5759b ("irqdomain: Fix handling of type settings for existing mappings")
> Link: https://lore.kernel.org/r/YuJXMHoT4ijUxnRb@hovoldconsulting.com
> Cc: stable@...r.kernel.org      # 4.8
> Cc: Dmitry Torokhov <dtor@...omium.org>
> Cc: Jon Hunter <jonathanh@...dia.com>
> Tested-by: Hsin-Yi Wang <hsinyi@...omium.org>
> Tested-by: Mark-PK Tsai <mark-pk.tsai@...iatek.com>
> Signed-off-by: Johan Hovold <johan+linaro@...nel.org>
> Signed-off-by: Marc Zyngier <maz@...nel.org>
> Link: https://lore.kernel.org/r/20230213104302.17307-7-johan+linaro@kernel.org
> Signed-off-by: Sasha Levin <sashal@...nel.org>
> Signed-off-by: Mark-PK Tsai <mark-pk.tsai@...iatek.com>

5.4 also need this patch.
Could someone please help to review it?

Thanks,
Mark-PK Tsai