linux-kernel - [PATCH] genirq: no need to mask non trigger mode flags before __irq_set

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Date:	Tue, 19 Jul 2016 15:54:08 +0600
From:	Alexander Kuleshov <kuleshovmail@...il.com>
To:	Thomas Gleixner <tglx@...utronix.de>
Cc:	linux-kernel@...r.kernel.org,
	Alexander Kuleshov <kuleshovmail@...il.com>
Subject: [PATCH] genirq: no need to mask non trigger mode flags before __irq_set_trigger()

Some callers of __irq_set_trigger() masks all flags besides trigger mode
flags. Actually it is unnecessary operation now, because the
__irq_set_trigger() already does this before usage of flags.

Signed-off-by: Alexander Kuleshov <kuleshovmail@...il.com>
---
 kernel/irq/chip.c   | 1 -
 kernel/irq/manage.c | 5 ++---
 2 files changed, 2 insertions(+), 4 deletions(-)

diff --git a/kernel/irq/chip.c b/kernel/irq/chip.c
index 2f9f2b0..38f2fa4 100644
--- a/kernel/irq/chip.c
+++ b/kernel/irq/chip.c
@@ -76,7 +76,6 @@ int irq_set_irq_type(unsigned int irq, unsigned int type)
 	if (!desc)
 		return -EINVAL;
 
-	type &= IRQ_TYPE_SENSE_MASK;
 	ret = __irq_set_trigger(desc, type);
 	irq_put_desc_busunlock(desc, flags);
 	return ret;
diff --git a/kernel/irq/manage.c b/kernel/irq/manage.c
index ef0bc02..f33c719 100644
--- a/kernel/irq/manage.c
+++ b/kernel/irq/manage.c
@@ -662,7 +662,7 @@ int __irq_set_trigger(struct irq_desc *desc, unsigned long flags)
 			unmask = 1;
 	}
 
-	/* caller masked out all except trigger mode flags */
+	/* all flags except trigger mode flags are masked */
 	ret = chip->irq_set_type(&desc->irq_data, flags);
 
 	switch (ret) {
@@ -1730,8 +1730,7 @@ void enable_percpu_irq(unsigned int irq, unsigned int type)
 	if (!desc)
 		return;
 
-	type &= IRQ_TYPE_SENSE_MASK;
-	if (type != IRQ_TYPE_NONE) {
+	if (type & IRQ_TYPE_SENSE_MASK) {
 		int ret;
 
 		ret = __irq_set_trigger(desc, type);
-- 
2.8.0.rc3.922.g2bcc146