linux-kernel - [PATCH v2] gpiolib: Fix GPIO chip IRQ initialization restriction

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Message-Id: <20230607081803.778223-1-jiawenwu@trustnetic.com>
Date:   Wed,  7 Jun 2023 16:18:03 +0800
From:   Jiawen Wu <jiawenwu@...stnetic.com>
To:     linus.walleij@...aro.org, brgl@...ev.pl,
        shreeya.patel@...labora.com, andy.shevchenko@...il.com,
        linux-gpio@...r.kernel.org, linux-kernel@...r.kernel.org
Cc:     Jiawen Wu <jiawenwu@...stnetic.com>
Subject: [PATCH v2] gpiolib: Fix GPIO chip IRQ initialization restriction

In case of gpio-regmap, IRQ chip is added by regmap-irq and associated with
GPIO chip by gpiochip_irqchip_add_domain(). The initialization flag was not
added in gpiochip_irqchip_add_domain(), causing gpiochip_to_irq() to return
-EPROBE_DEFER.

Fixes: 5467801f1fcb ("gpio: Restrict usage of GPIO chip irq members before initialization")
Signed-off-by: Jiawen Wu <jiawenwu@...stnetic.com>
---
v1 -> v2:
- add compiler barrier
---
 drivers/gpio/gpiolib.c | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/drivers/gpio/gpiolib.c b/drivers/gpio/gpiolib.c
index a7220e04a93e..9ecf93cbd801 100644
--- a/drivers/gpio/gpiolib.c
+++ b/drivers/gpio/gpiolib.c
@@ -1792,6 +1792,14 @@ int gpiochip_irqchip_add_domain(struct gpio_chip *gc,
 	gc->to_irq = gpiochip_to_irq;
 	gc->irq.domain = domain;
 
+	/*
+	 * Using barrier() here to prevent compiler from reordering
+	 * gc->irq.initialized before adding irqdomain.
+	 */
+	barrier();
+
+	gc->irq.initialized = true;
+
 	return 0;
 }
 EXPORT_SYMBOL_GPL(gpiochip_irqchip_add_domain);
-- 
2.27.0