linux-kernel - Re: [PATCH v3 00/24] gpio: rework locking and object life-time control

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Date: Fri, 19 Apr 2024 15:03:54 +0800
From: Jiawen Wu <jiawenwu@...stnetic.com>
To: <brgl@...ev.pl>
Cc: <andriy.shevchenko@...ux.intel.com>,
	<bartosz.golaszewski@...aro.org>,
	<elder@...aro.org>,
	<geert+renesas@...der.be>,
	<linus.walleij@...aro.org>,
	<linux-gpio@...r.kernel.org>,
	<linux-kernel@...r.kernel.org>,
	<paulmck@...nel.org>,
	<warthog618@...il.com>,
	<wsa@...-dreams.de>
Subject: Re: [PATCH v3 00/24] gpio: rework locking and object life-time control

Hi Bartosz Golaszewski,

I ran into a kernel crash problem when I pull the latest net-next.git, and
finally it was found that is caused by this patch series merged.

The kernel crashed because I got gpio=0 when I called irq_find_mapping()
and then struct irq_data *d=null, as my driver describes:

	int gpio = irq_find_mapping(gc->irq.domain, hwirq);
	struct irq_data *d = irq_get_irq_data(gpio);

	txgbe_gpio_irq_ack(d);

The deeper positioning is this line in __irq_resolve_mapping().

	data = rcu_dereference(domain->revmap[hwirq]);

So, is it the addition of SRCU infrastructure that causes this issue?

Thanks,
Jiawen