[PATCH 15/18] xtensa: replace setup_irq() by request_irq()

afzal mohammed
2020-02-12T08:05:30Z

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wherever that has been found, it too has been replaced by free_irq().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

arch/xtensa/kernel/smp.c | 8 ++------
arch/xtensa/kernel/time.c | 10 +++-------
2 files changed, 5 insertions(+), 13 deletions(-)

diff --git a/arch/xtensa/kernel/smp.c b/arch/xtensa/kernel/smp.c
index 83b244ce61ee..22a117ca0c4d 100644
--- a/arch/xtensa/kernel/smp.c
+++ b/arch/xtensa/kernel/smp.c
@@ -53,16 +53,12 @@ static void system_flush_invalidate_dcache_range(unsigned long start,
#define IPI_IRQ 0

static irqreturn_t ipi_interrupt(int irq, void *dev_id);
-static struct irqaction ipi_irqaction = {
- .handler = ipi_interrupt,
- .flags = IRQF_PERCPU,
- .name = "ipi",
-};

void ipi_init(void)
{
unsigned irq = irq_create_mapping(NULL, IPI_IRQ);
- setup_irq(irq, &ipi_irqaction);
+ if (request_irq(irq, ipi_interrupt, IRQF_PERCPU, "ipi", NULL))
+ pr_err("request_irq() on %s failed\n", "ipi");
}

static inline unsigned int get_core_count(void)
diff --git a/arch/xtensa/kernel/time.c b/arch/xtensa/kernel/time.c
index 69db8c93c1f9..cd7651c603d2 100644
--- a/arch/xtensa/kernel/time.c
+++ b/arch/xtensa/kernel/time.c
@@ -128,12 +128,6 @@ static irqreturn_t timer_interrupt(int irq, void *dev_id)
return IRQ_HANDLED;
}

-static struct irqaction timer_irqaction = {
- .handler = timer_interrupt,
- .flags = IRQF_TIMER,
- .name = "timer",
-};
-
void local_timer_setup(unsigned cpu)
{
struct ccount_timer *timer = &per_cpu(ccount_timer, cpu);
@@ -199,7 +193,9 @@ void __init time_init(void)
__func__);
clocksource_register_hz(&ccount_clocksource, ccount_freq);
local_timer_setup(0);
- setup_irq(this_cpu_ptr(&ccount_timer)->evt.irq, &timer_irqaction);
+ if (request_irq(this_cpu_ptr(&ccount_timer)->evt.irq, timer_interrupt,
+ IRQF_TIMER, "timer", NULL))
+ pr_err("request_irq() on %s failed\n", "timer");
sched_clock_register(ccount_sched_clock_read, 32, ccount_freq);
timer_probe();
}
--
2.24.1