linux-kernel - [PATCH] gpiolib: gpio_name_to

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Message-Id: <64270a8cc4bfca77ef4e280e5ab4623f4525ff39.1584290011.git.mirq-linux@rere.qmqm.pl>
Date:   Sun, 15 Mar 2020 17:34:34 +0100
From:   Michał Mirosław <mirq-linux@...e.qmqm.pl>
To:     Linus Walleij <linus.walleij@...aro.org>,
        Bartosz Golaszewski <bgolaszewski@...libre.com>
Cc:     linux-gpio@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH] gpiolib: gpio_name_to_desc: factor out !name check

Since name == NULL can't ever match, move the check out of
IRQ-disabled region.

Signed-off-by: Michał Mirosław <mirq-linux@...e.qmqm.pl>
---
 drivers/gpio/gpiolib.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/drivers/gpio/gpiolib.c b/drivers/gpio/gpiolib.c
index 175c6363cf61..20fbeffbdd91 100644
--- a/drivers/gpio/gpiolib.c
+++ b/drivers/gpio/gpiolib.c
@@ -301,6 +301,9 @@ static struct gpio_desc *gpio_name_to_desc(const char * const name)
 	struct gpio_device *gdev;
 	unsigned long flags;
 
+	if (!name)
+		return NULL;
+
 	spin_lock_irqsave(&gpio_lock, flags);
 
 	list_for_each_entry(gdev, &gpio_devices, list) {
@@ -309,7 +312,7 @@ static struct gpio_desc *gpio_name_to_desc(const char * const name)
 		for (i = 0; i != gdev->ngpio; ++i) {
 			struct gpio_desc *desc = &gdev->descs[i];
 
-			if (!desc->name || !name)
+			if (!desc->name)
 				continue;
 
 			if (!strcmp(desc->name, name)) {
-- 
2.20.1