From: Stephen Boyd Date: Mon, 8 Oct 2018 16:32:14 +0000 (-0700) Subject: gpio: Drop parent irq assignment during cascade setup X-Git-Tag: v4.20-rc1~181^2~2 X-Git-Url: http://git.ipfire.org/?a=commitdiff_plain;h=9cb7cf9c4ebb19981cfa156cc60e2a75a51ccf1b;p=thirdparty%2Fkernel%2Flinux.git gpio: Drop parent irq assignment during cascade setup We want to set the irq parent for interrupts that we're setting up to be cascaded from another interrupt controller, but we may or may not have already mapped the gpiochip irqs into the kernel's virtual irq number space at this point. If we have mapped irqs before calling here, then we've gone through gpiochip_irq_map() and called irq_set_parent() already. If we haven't mapped irqs, then the gpiochip is dynamically mapping irqs and we can rely on gpiochip_irq_map() or the gpio driver's irqdomain ops to setup the irq parent properly. Either way, setting the parent here when cascading the gpiochip doesn't make much sense because it should be done at irq mapping time. In the dynamic mapping case, this code is mapping virq 0 to some parent virq in a loop. While that's benign, let's drop this code to simplify. Cc: Evan Green Cc: Thierry Reding Cc: Grygorii Strashko Signed-off-by: Stephen Boyd Signed-off-by: Linus Walleij --- diff --git a/drivers/gpio/gpiolib.c b/drivers/gpio/gpiolib.c index 1a283fbac84c5..350b0541fdb09 100644 --- a/drivers/gpio/gpiolib.c +++ b/drivers/gpio/gpiolib.c @@ -1675,8 +1675,6 @@ static void gpiochip_set_cascaded_irqchip(struct gpio_chip *gpiochip, unsigned int parent_irq, irq_flow_handler_t parent_handler) { - unsigned int offset; - if (!gpiochip->irq.domain) { chip_err(gpiochip, "called %s before setting up irqchip\n", __func__); @@ -1699,14 +1697,6 @@ static void gpiochip_set_cascaded_irqchip(struct gpio_chip *gpiochip, gpiochip->irq.parents = &parent_irq; gpiochip->irq.num_parents = 1; } - - /* Set the parent IRQ for all affected IRQs */ - for (offset = 0; offset < gpiochip->ngpio; offset++) { - if (!gpiochip_irqchip_irq_valid(gpiochip, offset)) - continue; - irq_set_parent(irq_find_mapping(gpiochip->irq.domain, offset), - parent_irq); - } } /**