linux-kernel - [PATCH 5.15 102/124] gpio: Request interrupts after IRQ is initialized

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Date:   Tue, 26 Apr 2022 10:21:43 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org,
        Mario Limonciello <mario.limonciello@....com>,
        Shreeya Patel <shreeya.patel@...labora.com>,
        Samuel Čavoj <samuel@...oj.net>,
        Andy Shevchenko <andy.shevchenko@...il.com>,
        Linus Walleij <linus.walleij@...aro.org>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        lukeluk498@...il.com, Takashi Iwai <tiwai@...e.de>
Subject: [PATCH 5.15 102/124] gpio: Request interrupts after IRQ is initialized

From: Mario Limonciello <mario.limonciello@....com>

commit 06fb4ecfeac7e00d6704fa5ed19299f2fefb3cc9 upstream.

Commit 5467801f1fcb ("gpio: Restrict usage of GPIO chip irq members
before initialization") attempted to fix a race condition that lead to a
NULL pointer, but in the process caused a regression for _AEI/_EVT
declared GPIOs.

This manifests in messages showing deferred probing while trying to
allocate IRQs like so:

  amd_gpio AMDI0030:00: Failed to translate GPIO pin 0x0000 to IRQ, err -517
  amd_gpio AMDI0030:00: Failed to translate GPIO pin 0x002C to IRQ, err -517
  amd_gpio AMDI0030:00: Failed to translate GPIO pin 0x003D to IRQ, err -517
  [ .. more of the same .. ]

The code for walking _AEI doesn't handle deferred probing and so this
leads to non-functional GPIO interrupts.

Fix this issue by moving the call to `acpi_gpiochip_request_interrupts`
to occur after gc->irc.initialized is set.

Fixes: 5467801f1fcb ("gpio: Restrict usage of GPIO chip irq members before initialization")
Link: https://lore.kernel.org/linux-gpio/BL1PR12MB51577A77F000A008AA694675E2EF9@BL1PR12MB5157.namprd12.prod.outlook.com/
Link: https://bugzilla.suse.com/show_bug.cgi?id=1198697
Link: https://bugzilla.kernel.org/show_bug.cgi?id=215850
Link: https://gitlab.freedesktop.org/drm/amd/-/issues/1979
Link: https://gitlab.freedesktop.org/drm/amd/-/issues/1976
Reported-by: Mario Limonciello <mario.limonciello@....com>
Signed-off-by: Mario Limonciello <mario.limonciello@....com>
Reviewed-by: Shreeya Patel <shreeya.patel@...labora.com>
Tested-By: Samuel Čavoj <samuel@...oj.net>
Tested-By: lukeluk498@...il.com Link:
Reviewed-by: Andy Shevchenko <andy.shevchenko@...il.com>
Acked-by: Linus Walleij <linus.walleij@...aro.org>
Reviewed-and-tested-by: Takashi Iwai <tiwai@...e.de>
Cc: Shreeya Patel <shreeya.patel@...labora.com>
Cc: stable@...r.kernel.org
Signed-off-by: Linus Torvalds <torvalds@...ux-foundation.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 drivers/gpio/gpiolib.c |    4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

--- a/drivers/gpio/gpiolib.c
+++ b/drivers/gpio/gpiolib.c
@@ -1560,8 +1560,6 @@ static int gpiochip_add_irqchip(struct g
 
 	gpiochip_set_irq_hooks(gc);
 
-	acpi_gpiochip_request_interrupts(gc);
-
 	/*
 	 * Using barrier() here to prevent compiler from reordering
 	 * gc->irq.initialized before initialization of above
@@ -1571,6 +1569,8 @@ static int gpiochip_add_irqchip(struct g
 
 	gc->irq.initialized = true;
 
+	acpi_gpiochip_request_interrupts(gc);
+
 	return 0;
 }