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authorKrzysztof Kozlowski <krzk@kernel.org>2017-06-16 22:28:07 +0300
committerAlexandre Belloni <alexandre.belloni@free-electrons.com>2017-06-24 23:52:43 +0300
commit498bcf313985c76c4572d8ce885a6480728d28f9 (patch)
tree06e453a1f2528cfd9b801f7f877a38c4b7b2b1e2 /drivers/rtc/rtc-s3c.c
parent9903f68af6ca9d9b25f5c50bfedd2e0cb899f848 (diff)
downloadlinux-498bcf313985c76c4572d8ce885a6480728d28f9.tar.xz
rtc: s3c: Handle clock enable failures
clk_enable() can fail so handle such case. Signed-off-by: Krzysztof Kozlowski <krzk@kernel.org> Signed-off-by: Alexandre Belloni <alexandre.belloni@free-electrons.com>
Diffstat (limited to 'drivers/rtc/rtc-s3c.c')
-rw-r--r--drivers/rtc/rtc-s3c.c72
1 files changed, 57 insertions, 15 deletions
diff --git a/drivers/rtc/rtc-s3c.c b/drivers/rtc/rtc-s3c.c
index 0cb2f27a30b4..a8992c227f61 100644
--- a/drivers/rtc/rtc-s3c.c
+++ b/drivers/rtc/rtc-s3c.c
@@ -68,18 +68,32 @@ struct s3c_rtc_data {
void (*disable) (struct s3c_rtc *info);
};
-static void s3c_rtc_enable_clk(struct s3c_rtc *info)
+static int s3c_rtc_enable_clk(struct s3c_rtc *info)
{
unsigned long irq_flags;
+ int ret = 0;
spin_lock_irqsave(&info->alarm_clk_lock, irq_flags);
+
if (info->clk_disabled) {
- clk_enable(info->rtc_clk);
- if (info->data->needs_src_clk)
- clk_enable(info->rtc_src_clk);
+ ret = clk_enable(info->rtc_clk);
+ if (ret)
+ goto out;
+
+ if (info->data->needs_src_clk) {
+ ret = clk_enable(info->rtc_src_clk);
+ if (ret) {
+ clk_disable(info->rtc_clk);
+ goto out;
+ }
+ }
info->clk_disabled = false;
}
+
+out:
spin_unlock_irqrestore(&info->alarm_clk_lock, irq_flags);
+
+ return ret;
}
static void s3c_rtc_disable_clk(struct s3c_rtc *info)
@@ -122,10 +136,13 @@ static int s3c_rtc_setaie(struct device *dev, unsigned int enabled)
{
struct s3c_rtc *info = dev_get_drvdata(dev);
unsigned int tmp;
+ int ret;
dev_dbg(info->dev, "%s: aie=%d\n", __func__, enabled);
- s3c_rtc_enable_clk(info);
+ ret = s3c_rtc_enable_clk(info);
+ if (ret)
+ return ret;
tmp = readb(info->base + S3C2410_RTCALM) & ~S3C2410_RTCALM_ALMEN;
@@ -136,10 +153,13 @@ static int s3c_rtc_setaie(struct device *dev, unsigned int enabled)
s3c_rtc_disable_clk(info);
- if (enabled)
- s3c_rtc_enable_clk(info);
- else
+ if (enabled) {
+ ret = s3c_rtc_enable_clk(info);
+ if (ret)
+ return ret;
+ } else {
s3c_rtc_disable_clk(info);
+ }
return 0;
}
@@ -147,10 +167,14 @@ static int s3c_rtc_setaie(struct device *dev, unsigned int enabled)
/* Set RTC frequency */
static int s3c_rtc_setfreq(struct s3c_rtc *info, int freq)
{
+ int ret;
+
if (!is_power_of_2(freq))
return -EINVAL;
- s3c_rtc_enable_clk(info);
+ ret = s3c_rtc_enable_clk(info);
+ if (ret)
+ return ret;
spin_lock_irq(&info->pie_lock);
if (info->data->set_freq)
@@ -167,8 +191,11 @@ static int s3c_rtc_gettime(struct device *dev, struct rtc_time *rtc_tm)
{
struct s3c_rtc *info = dev_get_drvdata(dev);
unsigned int have_retried = 0;
+ int ret;
- s3c_rtc_enable_clk(info);
+ ret = s3c_rtc_enable_clk(info);
+ if (ret)
+ return ret;
retry_get_time:
rtc_tm->tm_min = readb(info->base + S3C2410_RTCMIN);
@@ -212,6 +239,7 @@ static int s3c_rtc_settime(struct device *dev, struct rtc_time *tm)
{
struct s3c_rtc *info = dev_get_drvdata(dev);
int year = tm->tm_year - 100;
+ int ret;
dev_dbg(dev, "set time %04d.%02d.%02d %02d:%02d:%02d\n",
1900 + tm->tm_year, tm->tm_mon, tm->tm_mday,
@@ -224,7 +252,9 @@ static int s3c_rtc_settime(struct device *dev, struct rtc_time *tm)
return -EINVAL;
}
- s3c_rtc_enable_clk(info);
+ ret = s3c_rtc_enable_clk(info);
+ if (ret)
+ return ret;
writeb(bin2bcd(tm->tm_sec), info->base + S3C2410_RTCSEC);
writeb(bin2bcd(tm->tm_min), info->base + S3C2410_RTCMIN);
@@ -243,8 +273,11 @@ static int s3c_rtc_getalarm(struct device *dev, struct rtc_wkalrm *alrm)
struct s3c_rtc *info = dev_get_drvdata(dev);
struct rtc_time *alm_tm = &alrm->time;
unsigned int alm_en;
+ int ret;
- s3c_rtc_enable_clk(info);
+ ret = s3c_rtc_enable_clk(info);
+ if (ret)
+ return ret;
alm_tm->tm_sec = readb(info->base + S3C2410_ALMSEC);
alm_tm->tm_min = readb(info->base + S3C2410_ALMMIN);
@@ -293,6 +326,7 @@ static int s3c_rtc_setalarm(struct device *dev, struct rtc_wkalrm *alrm)
struct s3c_rtc *info = dev_get_drvdata(dev);
struct rtc_time *tm = &alrm->time;
unsigned int alrm_en;
+ int ret;
int year = tm->tm_year - 100;
dev_dbg(dev, "s3c_rtc_setalarm: %d, %04d.%02d.%02d %02d:%02d:%02d\n",
@@ -300,7 +334,9 @@ static int s3c_rtc_setalarm(struct device *dev, struct rtc_wkalrm *alrm)
1900 + tm->tm_year, tm->tm_mon + 1, tm->tm_mday,
tm->tm_hour, tm->tm_min, tm->tm_sec);
- s3c_rtc_enable_clk(info);
+ ret = s3c_rtc_enable_clk(info);
+ if (ret)
+ return ret;
alrm_en = readb(info->base + S3C2410_RTCALM) & S3C2410_RTCALM_ALMEN;
writeb(0x00, info->base + S3C2410_RTCALM);
@@ -349,8 +385,11 @@ static int s3c_rtc_setalarm(struct device *dev, struct rtc_wkalrm *alrm)
static int s3c_rtc_proc(struct device *dev, struct seq_file *seq)
{
struct s3c_rtc *info = dev_get_drvdata(dev);
+ int ret;
- s3c_rtc_enable_clk(info);
+ ret = s3c_rtc_enable_clk(info);
+ if (ret)
+ return ret;
if (info->data->enable_tick)
info->data->enable_tick(info, seq);
@@ -589,8 +628,11 @@ err_src_clk:
static int s3c_rtc_suspend(struct device *dev)
{
struct s3c_rtc *info = dev_get_drvdata(dev);
+ int ret;
- s3c_rtc_enable_clk(info);
+ ret = s3c_rtc_enable_clk(info);
+ if (ret)
+ return ret;
/* save TICNT for anyone using periodic interrupts */
if (info->data->save_tick_cnt)