From a16e8393ac03cc24fd9b838f42823b4242ceac88 Mon Sep 17 00:00:00 2001 From: Lars-Peter Clausen Date: Thu, 4 Oct 2012 17:14:01 -0700 Subject: [PATCH] drivers/rtc/rtc-spear.c: fix several error checks There are several comparisons of a unsigned int to less than zero int spear RTC driver. Such a check will always be true. In all these cases a signed int is assigned to the unsigned variable, which is checked, before. So the right fix is to make the checked variable signed as well. In one case the check can be dropped completely, because all it does it returns 'err' if 'err' is less than zero, otherwise it returns 0. Since in this particular case 'err' is always either 0 or less this is the same as just returning 'err'. The issue has been found using the following coccinelle semantic patch: // @@ type T; unsigned T i; @@ ( *i < 0 | *i >= 0 ) // Signed-off-by: Lars-Peter Clausen Cc: Viresh Kumar Cc: Alessandro Zummo Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- drivers/rtc/rtc-spear.c | 12 +++++------- 1 file changed, 5 insertions(+), 7 deletions(-) diff --git a/drivers/rtc/rtc-spear.c b/drivers/rtc/rtc-spear.c index e2785479113c..bb507d23f6ce 100644 --- a/drivers/rtc/rtc-spear.c +++ b/drivers/rtc/rtc-spear.c @@ -235,7 +235,7 @@ static int spear_rtc_read_time(struct device *dev, struct rtc_time *tm) static int spear_rtc_set_time(struct device *dev, struct rtc_time *tm) { struct spear_rtc_config *config = dev_get_drvdata(dev); - unsigned int time, date, err = 0; + unsigned int time, date; if (tm2bcd(tm) < 0) return -EINVAL; @@ -247,11 +247,8 @@ static int spear_rtc_set_time(struct device *dev, struct rtc_time *tm) (tm->tm_year << YEAR_SHIFT); writel(time, config->ioaddr + TIME_REG); writel(date, config->ioaddr + DATE_REG); - err = is_write_complete(config); - if (err < 0) - return err; - return 0; + return is_write_complete(config); } /* @@ -295,7 +292,8 @@ static int spear_rtc_read_alarm(struct device *dev, struct rtc_wkalrm *alm) static int spear_rtc_set_alarm(struct device *dev, struct rtc_wkalrm *alm) { struct spear_rtc_config *config = dev_get_drvdata(dev); - unsigned int time, date, err = 0; + unsigned int time, date; + int err; if (tm2bcd(&alm->time) < 0) return -EINVAL; @@ -357,7 +355,7 @@ static int __devinit spear_rtc_probe(struct platform_device *pdev) { struct resource *res; struct spear_rtc_config *config; - unsigned int status = 0; + int status = 0; int irq; res = platform_get_resource(pdev, IORESOURCE_MEM, 0); -- 2.20.1