This is a note to let you know that I've just added the patch titled
gpiolib: Fix irq_domain resource tracking for gpiochip_irqchip_add_domain()
to the 6.3-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
gpiolib-fix-irq_domain-resource-tracking-for-gpiochi.patch
and it can be found in the queue-6.3 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
commit 2e36626e2c45ebb599b000fb08254ddb8cfc60ac
Author: Michael Walle <mwalle@xxxxxxxxxx>
Date: Mon Jun 19 10:56:07 2023 +0200
gpiolib: Fix irq_domain resource tracking for gpiochip_irqchip_add_domain()
[ Upstream commit ff7a1790fbf92f1bdd0966d3f0da3ea808ede876 ]
Up until commit 6a45b0e2589f ("gpiolib: Introduce
gpiochip_irqchip_add_domain()") all irq_domains were allocated
by gpiolib itself and thus gpiolib also takes care of freeing it.
With gpiochip_irqchip_add_domain() a user of gpiolib can associate an
irq_domain with the gpio_chip. This irq_domain is not managed by
gpiolib and therefore must not be freed by gpiolib.
Fixes: 6a45b0e2589f ("gpiolib: Introduce gpiochip_irqchip_add_domain()")
Reported-by: Jiawen Wu <jiawenwu@xxxxxxxxxxxxxx>
Signed-off-by: Michael Walle <mwalle@xxxxxxxxxx>
Reviewed-by: Linus Walleij <linus.walleij@xxxxxxxxxx>
Reviewed-by: Andy Shevchenko <andy@xxxxxxxxxx>
Signed-off-by: Bartosz Golaszewski <bartosz.golaszewski@xxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
diff --git a/drivers/gpio/gpiolib.c b/drivers/gpio/gpiolib.c
index 1cfddbb3443d0..ce8f71e06eb62 100644
--- a/drivers/gpio/gpiolib.c
+++ b/drivers/gpio/gpiolib.c
@@ -1716,7 +1716,7 @@ static void gpiochip_irqchip_remove(struct gpio_chip *gc)
}
/* Remove all IRQ mappings and delete the domain */
- if (gc->irq.domain) {
+ if (!gc->irq.domain_is_allocated_externally && gc->irq.domain) {
unsigned int irq;
for (offset = 0; offset < gc->ngpio; offset++) {
@@ -1762,6 +1762,7 @@ int gpiochip_irqchip_add_domain(struct gpio_chip *gc,
gc->to_irq = gpiochip_to_irq;
gc->irq.domain = domain;
+ gc->irq.domain_is_allocated_externally = true;
/*
* Using barrier() here to prevent compiler from reordering
diff --git a/include/linux/gpio/driver.h b/include/linux/gpio/driver.h
index ccd8a512d8546..b769ff6b00fdd 100644
--- a/include/linux/gpio/driver.h
+++ b/include/linux/gpio/driver.h
@@ -244,6 +244,14 @@ struct gpio_irq_chip {
*/
bool initialized;
+ /**
+ * @domain_is_allocated_externally:
+ *
+ * True it the irq_domain was allocated outside of gpiolib, in which
+ * case gpiolib won't free the irq_domain itself.
+ */
+ bool domain_is_allocated_externally;
+
/**
* @init_hw: optional routine to initialize hardware before
* an IRQ chip will be added. This is quite useful when
