[PATCH 09/18] parisc: Replace setup_irq() by request_irq()

afzal mohammed
2020-02-12T08:04:18Z

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wherever that has been found, it too has been replaced by free_irq().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/parisc/kernel/irq.c | 21 +++++----------------
drivers/parisc/eisa.c | 8 ++------
2 files changed, 7 insertions(+), 22 deletions(-)

diff --git a/arch/parisc/kernel/irq.c b/arch/parisc/kernel/irq.c
index e5fcfb70cc7c..b8fd4ae6b2cf 100644
--- a/arch/parisc/kernel/irq.c
+++ b/arch/parisc/kernel/irq.c
@@ -560,20 +560,6 @@ void do_cpu_irq_mask(struct pt_regs *regs)
goto out;
}

-static struct irqaction timer_action = {
- .handler = timer_interrupt,
- .name = "timer",
- .flags = IRQF_TIMER | IRQF_PERCPU | IRQF_IRQPOLL,
-};
-
-#ifdef CONFIG_SMP
-static struct irqaction ipi_action = {
- .handler = ipi_interrupt,
- .name = "IPI",
- .flags = IRQF_PERCPU,
-};
-#endif
-
static void claim_cpu_irqs(void)
{
int i;
@@ -583,10 +569,13 @@ static void claim_cpu_irqs(void)
}

irq_set_handler(TIMER_IRQ, handle_percpu_irq);
- setup_irq(TIMER_IRQ, &timer_action);
+ if (request_irq(TIMER_IRQ, timer_interrupt,
+ IRQF_TIMER | IRQF_PERCPU | IRQF_IRQPOLL, "timer", NULL))
+ pr_err("request_irq() on %s failed\n", "timer");
#ifdef CONFIG_SMP
irq_set_handler(IPI_IRQ, handle_percpu_irq);
- setup_irq(IPI_IRQ, &ipi_action);
+ if (request_irq(IPI_IRQ, ipi_interrupt, IRQF_PERCPU, "IPI", NULL))
+ pr_err("request_irq() on %s failed\n", "IPI");
#endif
}

diff --git a/drivers/parisc/eisa.c b/drivers/parisc/eisa.c
index 9d00a24277aa..fa75e6740de2 100644
--- a/drivers/parisc/eisa.c
+++ b/drivers/parisc/eisa.c
@@ -243,11 +243,6 @@ static irqreturn_t dummy_irq2_handler(int _, void *dev)
return IRQ_HANDLED;
}

-static struct irqaction irq2_action = {
- .handler = dummy_irq2_handler,
- .name = "cascade",
-};
-
static void init_eisa_pic(void)
{
unsigned long flags;
@@ -335,7 +330,8 @@ static int __init eisa_probe(struct parisc_device *dev)
}

/* Reserve IRQ2 */
- setup_irq(2, &irq2_action);
+ if (request_irq(2, dummy_irq2_handler, 0, "cascade", NULL))
+ pr_err("request_irq() on %s failed\n", "cascade");
for (i = 0; i < 16; i++) {
irq_set_chip_and_handler(i, &eisa_interrupt_type,
handle_simple_irq);
--
2.24.1