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From: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
To: Runyu Xiao <runyu.xiao@seu.edu.cn>
Cc: Linus Walleij <linus.walleij@linaro.org>,
	Bartosz Golaszewski <brgl@kernel.org>,
	Orson Zhai <orsonzhai@gmail.com>,
	Baolin Wang <baolin.wang@linux.alibaba.com>,
	Chunyan Zhang <zhang.lyra@gmail.com>,
	Andy Shevchenko <andy@kernel.org>,
	Clark Williams <clrkwllms@kernel.org>,
	Steven Rostedt <rostedt@goodmis.org>,
	Jan Kiszka <jan.kiszka@siemens.com>, linux-gpio@vger.kernel.org,
	linux-rt-devel@lists.linux.dev, linux-kernel@vger.kernel.org,
	jianhao.xu@seu.edu.cn, stable@vger.kernel.org
Subject: Re: [PATCH 1/2] gpio: sch: use raw_spinlock_t in the irq startup path
Message-ID: <20260618062839.4o1ewdEn@linutronix.de>
References: <20260617154035.1199948-1-runyu.xiao@seu.edu.cn>
 <20260617154035.1199948-2-runyu.xiao@seu.edu.cn>
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In-Reply-To: <20260617154035.1199948-2-runyu.xiao@seu.edu.cn>

On 2026-06-17 23:40:34 [+0800], Runyu Xiao wrote:
> sch_irq_unmask() enables the GPIO IRQ and then updates the controller
> state through sch_irq_mask_unmask(), which takes sch->lock with
> spin_lock_irqsave().  The callback can be reached from irq_startup()
> while setting up a requested IRQ.  That path is not sleepable, but on
> PREEMPT_RT a regular spinlock_t becomes a sleeping lock.
=E2=80=A6
> Fixes: 7a81638485c1 ("gpio: sch: Add edge event support")
> Cc: stable@vger.kernel.org
> Signed-off-by: Runyu Xiao <runyu.xiao@seu.edu.cn>

Reviewed-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>

Sebastian