linux-kernel - Re: [PATCH] pinctrl: apple: Use a raw spinlock for the regmap

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Date:   Wed, 25 May 2022 09:38:51 +0200
From:   Linus Walleij <linus.walleij@...aro.org>
To:     Hector Martin <marcan@...can.st>
Cc:     Sven Peter <sven@...npeter.dev>,
        Alyssa Rosenzweig <alyssa@...enzweig.io>,
        Marc Zyngier <maz@...nel.org>,
        linux-arm-kernel@...ts.infradead.org, linux-gpio@...r.kernel.org,
        linux-kernel@...r.kernel.org, asahi@...ts.linux.dev
Subject: Re: [PATCH] pinctrl: apple: Use a raw spinlock for the regmap

On Tue, May 24, 2022 at 4:22 PM Hector Martin <marcan@...can.st> wrote:

> The irqchip ops are called with a raw spinlock held, so the subsequent
> regmap usage cannot use a plain spinlock.
>
> spi-hid-apple-of spi0.0: spihid_apple_of_probe:74
>
> =============================
> [ BUG: Invalid wait context ]
> 5.18.0-asahi-00176-g0fa3ab03bdea #1337 Not tainted
> -----------------------------
> kworker/u20:3/86 is trying to lock:
> ffff8000166b5018 (pinctrl_apple_gpio:462:(&regmap_config)->lock){....}-{3:3}, at: regmap_lock_spinlock+0x18/0x30
> other info that might help us debug this:
> context-{5:5}
> 7 locks held by kworker/u20:3/86:
>  #0: ffff800017725d48 ((wq_completion)events_unbound){+.+.}-{0:0}, at: process_one_work+0x1c8/0x670
>  #1: ffff80001e33bdd0 (deferred_probe_work){+.+.}-{0:0}, at: process_one_work+0x1c8/0x670
>  #2: ffff800017d629a0 (&dev->mutex){....}-{4:4}, at: __device_attach+0x30/0x17c
>  #3: ffff80002414e618 (&ctlr->add_lock){+.+.}-{4:4}, at: spi_add_device+0x40/0x80
>  #4: ffff800024116990 (&dev->mutex){....}-{4:4}, at: __device_attach+0x30/0x17c
>  #5: ffff800022d4be58 (request_class){+.+.}-{4:4}, at: __setup_irq+0xa8/0x720
>  #6: ffff800022d4bcc8 (lock_class){....}-{2:2}, at: __setup_irq+0xcc/0x720
>
> Fixes: a0f160ffcb83 ("pinctrl: add pinctrl/GPIO driver for Apple SoCs")
> Signed-off-by: Hector Martin <marcan@...can.st>

Patch applied!

Yours,
Linus Walleij