[PATCH 17/18] irqchip: Replace setup_irq() by request_irq()

afzal mohammed
2020-02-12T08:05:57Z

request_irq() is preferred over setup_irq(). Existing callers of
setup_irq() reached mostly via 'init_IRQ()' & 'time_init()', while
memory allocators are ready by 'mm_init()'.

Per tglx[1], setup_irq() existed in olden days when allocators were not
ready by the time early interrupts were initialized.

Hence replace setup_irq() by request_irq().

Seldom remove_irq() usage has been observed coupled with setup_irq(),
wherever that has been found, it too has been replaced by free_irq().

[1] https://lkml.kernel.org/r/alpine.DEB.2.20.1710191609480.1971@nanos

Signed-off-by: afzal mohammed <afzal.mohd.ma@gmail.com>
---

Since cc'ing cover letter to all maintainers/reviewers would be too
many, refer for cover letter,
https://lkml.kernel.org/r/cover.1581478323.git.afzal.mohd.ma@gmail.com

drivers/irqchip/irq-i8259.c | 9 +++------
drivers/irqchip/irq-ingenic.c | 11 +++++------
2 files changed, 8 insertions(+), 12 deletions(-)

diff --git a/drivers/irqchip/irq-i8259.c b/drivers/irqchip/irq-i8259.c
index d000870d9b6b..e9798d02b256 100644
--- a/drivers/irqchip/irq-i8259.c
+++ b/drivers/irqchip/irq-i8259.c
@@ -271,11 +271,6 @@ static void init_8259A(int auto_eoi)
/*
* IRQ2 is cascade interrupt to second interrupt controller
*/
-static struct irqaction irq2 = {
- .handler = no_action,
- .name = "cascade",
- .flags = IRQF_NO_THREAD,
-};

static struct resource pic1_io_resource = {
.name = "pic1",
@@ -323,7 +318,9 @@ struct irq_domain * __init __init_i8259_irqs(struct device_node *node)
if (!domain)
panic("Failed to add i8259 IRQ domain");

- setup_irq(I8259A_IRQ_BASE + PIC_CASCADE_IR, &irq2);
+ if (request_irq(I8259A_IRQ_BASE + PIC_CASCADE_IR, no_action,
+ IRQF_NO_THREAD, "cascade", NULL))
+ pr_err("request_irq() on %s failed\n", "cascade");
register_syscore_ops(&i8259_syscore_ops);
return domain;
}
diff --git a/drivers/irqchip/irq-ingenic.c b/drivers/irqchip/irq-ingenic.c
index c5589ee0dfb3..5b20a0f0ece8 100644
--- a/drivers/irqchip/irq-ingenic.c
+++ b/drivers/irqchip/irq-ingenic.c
@@ -58,11 +58,6 @@ static irqreturn_t intc_cascade(int irq, void *data)
return IRQ_HANDLED;
}

-static struct irqaction intc_cascade_action = {
- .handler = intc_cascade,
- .name = "SoC intc cascade interrupt",
-};
-
static int __init ingenic_intc_of_init(struct device_node *node,
unsigned num_chips)
{
@@ -130,7 +125,11 @@ static int __init ingenic_intc_of_init(struct device_node *node,
irq_reg_writel(gc, IRQ_MSK(32), JZ_REG_INTC_SET_MASK);
}

- setup_irq(parent_irq, &intc_cascade_action);
+ if (request_irq(parent_irq, intc_cascade, 0,
+ "SoC intc cascade interrupt", NULL)) {
+ pr_err("request_irq() on %s failed\n",
+ "SoC intc cascade interrupt");
+ }
return 0;

out_domain_remove:
--
2.24.1