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auxdisplay: charlcd: delete mdelay in long_sleep 

The function long_sleep() calls mdelay() when in an interrupt handler.
But only charlcd_clear_display() and charlcd_init_display calls
long_sleep(), and my tool finds that the two functions
are never called in an interrupt handler.
Thus mdelay() and in_interrupt() are not necessary.

This is found by a static analysis tool named DCNS written by myself.

Signed-off-by: Jia-Ju Bai <baijiaju1990@gmail.com>
Acked-by: Willy Tarreau <w@1wt.eu>
Signed-off-by: Miguel Ojeda <miguel.ojeda.sandonis@gmail.com>
This commit is contained in:
Jia-Ju Bai 2018-01-26 23:19:15 +08:00 committed by Miguel Ojeda
parent acb1872577
commit 171613926a
1 changed files with 1 additions and 4 deletions
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5
drivers/auxdisplay/charlcd.c
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@ -99,10 +99,7 @@ static atomic_t charlcd_available = ATOMIC_INIT(1);
/* sleeps that many milliseconds with a reschedule */
static void long_sleep(int ms)
{
if (in_interrupt())
mdelay(ms);
else
schedule_timeout_interruptible(msecs_to_jiffies(ms));
schedule_timeout_interruptible(msecs_to_jiffies(ms));
}
/* turn the backlight on or off */