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gpio fixes for v6.4

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- fix IRQ initialization in gpiochip_irqchip_add_domain()
 - add a missing return value check for platform_get_irq() in gpio-sifive
 - don't free irq_domains which GPIOLIB does not manage
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Merge tag 'gpio-fixes-for-v6.4' of git://git.kernel.org/pub/scm/linux/kernel/git/brgl/linux

Pull gpio fixes from Bartosz Golaszewski:

 - fix IRQ initialization in gpiochip_irqchip_add_domain()

 - add a missing return value check for platform_get_irq() in
   gpio-sifive

 - don't free irq_domains which GPIOLIB does not manage

* tag 'gpio-fixes-for-v6.4' of git://git.kernel.org/pub/scm/linux/kernel/git/brgl/linux:
  gpiolib: Fix irq_domain resource tracking for gpiochip_irqchip_add_domain()
  gpio: sifive: add missing check for platform_get_irq
  gpiolib: Fix GPIO chip IRQ initialization restriction
This commit is contained in:
Linus Torvalds 2023-06-23 15:24:09 -07:00
commit 6edecb9986
3 changed files with 24 additions and 3 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

8
drivers/gpio/gpio-sifive.c
View File

@ -221,8 +221,12 @@ static int sifive_gpio_probe(struct platform_device *pdev)
return -ENODEV;
}
for (i = 0; i < ngpio; i++)
chip->irq_number[i] = platform_get_irq(pdev, i);
for (i = 0; i < ngpio; i++) {
ret = platform_get_irq(pdev, i);
if (ret < 0)
return ret;
chip->irq_number[i] = ret;
}
ret = bgpio_init(&chip->gc, dev, 4,
chip->base + SIFIVE_GPIO_INPUT_VAL,

11
drivers/gpio/gpiolib.c
View File

@ -1745,7 +1745,7 @@ 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++) {
@ -1791,6 +1791,15 @@ 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
* gc->irq.initialized before adding irqdomain.
*/
barrier();
gc->irq.initialized = true;
return 0;
}

8
include/linux/gpio/driver.h
View File

@ -251,6 +251,14 @@ 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