On 14/04/22 08:27, Mario Limonciello wrote:
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:
[ 0.688318] amd_gpio AMDI0030:00: Failed to translate GPIO pin 0x0000 to IRQ, err -517 [ 0.688337] amd_gpio AMDI0030:00: Failed to translate GPIO pin 0x002C to IRQ, err -517 [ 0.688348] amd_gpio AMDI0030:00: Failed to translate GPIO pin 0x003D to IRQ, err -517 [ 0.688359] amd_gpio AMDI0030:00: Failed to translate GPIO pin 0x003E to IRQ, err -517 [ 0.688369] amd_gpio AMDI0030:00: Failed to translate GPIO pin 0x003A to IRQ, err -517 [ 0.688379] amd_gpio AMDI0030:00: Failed to translate GPIO pin 0x003B to IRQ, err -517 [ 0.688389] amd_gpio AMDI0030:00: Failed to translate GPIO pin 0x0002 to IRQ, err -517 [ 0.688399] amd_gpio AMDI0030:00: Failed to translate GPIO pin 0x0011 to IRQ, err -517 [ 0.688410] amd_gpio AMDI0030:00: Failed to translate GPIO pin 0x0012 to IRQ, err -517 [ 0.688420] amd_gpio AMDI0030:00: Failed to translate GPIO pin 0x0007 to IRQ, err -517
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.
Thanks Mario for sending a fix for this issue, I didn't realize gpiod_to_irq() was also being called through acpi_gpiochip_request_interrupts(). Change looks good to me. Reviewed-by: Shreeya Patel shreeya.patel@collabora.com
Cc: Shreeya Patel shreeya.patel@collabora.com Cc: stable@vger.kernel.org Fixes: 5467801f1fcb ("gpio: Restrict usage of GPIO chip irq members before initialization") Reported-by: Mario Limonciello mario.limonciello@amd.com Link: https://lore.kernel.org/linux-gpio/BL1PR12MB51577A77F000A008AA694675E2EF9@BL... Signed-off-by: Mario Limonciello mario.limonciello@amd.com
drivers/gpio/gpiolib.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-)
diff --git a/drivers/gpio/gpiolib.c b/drivers/gpio/gpiolib.c index 085348e08986..b7694171655c 100644 --- a/drivers/gpio/gpiolib.c +++ b/drivers/gpio/gpiolib.c @@ -1601,8 +1601,6 @@ static int gpiochip_add_irqchip(struct gpio_chip *gc, 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
@@ -1612,6 +1610,8 @@ static int gpiochip_add_irqchip(struct gpio_chip *gc, gc->irq.initialized = true;
- acpi_gpiochip_request_interrupts(gc);
- return 0; }