linux-kernel - [PATCH v2 22/31] sparc/led: Use separate static data field with with static timer

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Date:   Wed, 20 Sep 2017 16:27:46 -0700
From:   Kees Cook <keescook@...omium.org>
To:     Thomas Gleixner <tglx@...utronix.de>
Cc:     Kees Cook <keescook@...omium.org>,
        "David S. Miller" <davem@...emloft.net>,
        Ingo Molnar <mingo@...nel.org>,
        Geliang Tang <geliangtang@...il.com>,
        sparclinux@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH v2 22/31] sparc/led: Use separate static data field with with static timer

In preparation for changing the timer callback argument to the timer
pointer, move to a separate static data variable.

Cc: "David S. Miller" <davem@...emloft.net>
Cc: Ingo Molnar <mingo@...nel.org>
Cc: Geliang Tang <geliangtang@...il.com>
Cc: sparclinux@...r.kernel.org
Signed-off-by: Kees Cook <keescook@...omium.org>
---
 arch/sparc/kernel/led.c | 14 ++++++++------
 1 file changed, 8 insertions(+), 6 deletions(-)

diff --git a/arch/sparc/kernel/led.c b/arch/sparc/kernel/led.c
index e278bf52963b..382860e482e0 100644
--- a/arch/sparc/kernel/led.c
+++ b/arch/sparc/kernel/led.c
@@ -31,19 +31,20 @@ static inline void led_toggle(void)
 }
 
 static struct timer_list led_blink_timer;
+static unsigned long led_blink_timer_timeout;
 
-static void led_blink(unsigned long timeout)
+static void led_blink(unsigned long unused)
 {
+	unsigned long timeout = led_blink_timer_timeout;
+
 	led_toggle();
 
 	/* reschedule */
 	if (!timeout) { /* blink according to load */
 		led_blink_timer.expires = jiffies +
 			((1 + (avenrun[0] >> FSHIFT)) * HZ);
-		led_blink_timer.data = 0;
 	} else { /* blink at user specified interval */
 		led_blink_timer.expires = jiffies + (timeout * HZ);
-		led_blink_timer.data = timeout;
 	}
 	add_timer(&led_blink_timer);
 }
@@ -88,8 +89,10 @@ static ssize_t led_proc_write(struct file *file, const char __user *buffer,
 	} else if (!strcmp(buf, "toggle")) {
 		led_toggle();
 	} else if ((*buf > '0') && (*buf <= '9')) {
-		led_blink(simple_strtoul(buf, NULL, 10));
+		led_blink_timer_timeout = simple_strtoul(buf, NULL, 10);
+		led_blink(0);
 	} else if (!strcmp(buf, "load")) {
+		led_blink_timer_timeout = 0;
 		led_blink(0);
 	} else {
 		auxio_set_led(AUXIO_LED_OFF);
@@ -115,8 +118,7 @@ static struct proc_dir_entry *led;
 
 static int __init led_init(void)
 {
-	init_timer(&led_blink_timer);
-	led_blink_timer.function = led_blink;
+	setup_timer(&led_blink_timer, led_blink, 0);
 
 	led = proc_create("led", 0, NULL, &led_proc_fops);
 	if (!led)
-- 
2.7.4