linux-kernel - [PATCH] irqchip/irq-xtensa-pic: clean up

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Message-Id: <20231205101307.1303186-1-jcmvbkbc@gmail.com>
Date:   Tue,  5 Dec 2023 02:13:07 -0800
From:   Max Filippov <jcmvbkbc@...il.com>
To:     linux-kernel@...r.kernel.org
Cc:     Chris Zankel <chris@...kel.net>,
        Thomas Gleixner <tglx@...utronix.de>,
        Max Filippov <jcmvbkbc@...il.com>
Subject: [PATCH] irqchip/irq-xtensa-pic: clean up

- get rid of the cached_irq_mask variable
- make mask/unmask operations atomic
- use BIT() macro instead of bit shifts
- drop .disable and .enable as they are equivalent to the default
  implementations

Signed-off-by: Max Filippov <jcmvbkbc@...il.com>
---
 drivers/irqchip/irq-xtensa-pic.c | 37 ++++++++++++++++----------------
 1 file changed, 18 insertions(+), 19 deletions(-)

diff --git a/drivers/irqchip/irq-xtensa-pic.c b/drivers/irqchip/irq-xtensa-pic.c
index 0c18d1f1e264..ebd1b77c4d11 100644
--- a/drivers/irqchip/irq-xtensa-pic.c
+++ b/drivers/irqchip/irq-xtensa-pic.c
@@ -12,6 +12,7 @@
  * Kevin Chea
  */
 
+#include <linux/bits.h>
 #include <linux/interrupt.h>
 #include <linux/irqdomain.h>
 #include <linux/irq.h>
@@ -19,8 +20,6 @@
 #include <linux/irqchip/xtensa-pic.h>
 #include <linux/of.h>
 
-unsigned int cached_irq_mask;
-
 /*
  * Device Tree IRQ specifier translation function which works with one or
  * two cell bindings. First cell value maps directly to the hwirq number.
@@ -44,34 +43,36 @@ static const struct irq_domain_ops xtensa_irq_domain_ops = {
 
 static void xtensa_irq_mask(struct irq_data *d)
 {
-	cached_irq_mask &= ~(1 << d->hwirq);
-	xtensa_set_sr(cached_irq_mask, intenable);
-}
+	unsigned long flags;
+	u32 irq_mask;
 
-static void xtensa_irq_unmask(struct irq_data *d)
-{
-	cached_irq_mask |= 1 << d->hwirq;
-	xtensa_set_sr(cached_irq_mask, intenable);
+	local_irq_save(flags);
+	irq_mask = xtensa_get_sr(intenable);
+	irq_mask &= ~BIT(d->hwirq);
+	xtensa_set_sr(irq_mask, intenable);
+	local_irq_restore(flags);
 }
 
-static void xtensa_irq_enable(struct irq_data *d)
+static void xtensa_irq_unmask(struct irq_data *d)
 {
-	xtensa_irq_unmask(d);
-}
+	unsigned long flags;
+	u32 irq_mask;
 
-static void xtensa_irq_disable(struct irq_data *d)
-{
-	xtensa_irq_mask(d);
+	local_irq_save(flags);
+	irq_mask = xtensa_get_sr(intenable);
+	irq_mask |= BIT(d->hwirq);
+	xtensa_set_sr(irq_mask, intenable);
+	local_irq_restore(flags);
 }
 
 static void xtensa_irq_ack(struct irq_data *d)
 {
-	xtensa_set_sr(1 << d->hwirq, intclear);
+	xtensa_set_sr(BIT(d->hwirq), intclear);
 }
 
 static int xtensa_irq_retrigger(struct irq_data *d)
 {
-	unsigned int mask = 1u << d->hwirq;
+	unsigned int mask = BIT(d->hwirq);
 
 	if (WARN_ON(mask & ~XCHAL_INTTYPE_MASK_SOFTWARE))
 		return 0;
@@ -81,8 +82,6 @@ static int xtensa_irq_retrigger(struct irq_data *d)
 
 static struct irq_chip xtensa_irq_chip = {
 	.name		= "xtensa",
-	.irq_enable	= xtensa_irq_enable,
-	.irq_disable	= xtensa_irq_disable,
 	.irq_mask	= xtensa_irq_mask,
 	.irq_unmask	= xtensa_irq_unmask,
 	.irq_ack	= xtensa_irq_ack,
-- 
2.39.2