drivers/rtc/rtc-stmp3xxx.c: provide timeout for potentially endless loop polling a HW bit

It's always a bad idea to poll on HW bits without a timeout.

The i.MX28 RTC can be easily brought into a state in which the RTC is
not running (until after a power-on-reset) and thus the status bits
which are polled in the driver won't ever change.

This patch prevents the kernel from getting stuck in this case.

Signed-off-by: Lothar Waßmann <LW@KARO-electronics.de>
Acked-by: Wolfram Sang <wsa@the-dreams.de>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 25 insertions, 10 deletions

diff --git a/drivers/rtc/rtc-stmp3xxx.c b/drivers/rtc/rtc-stmp3xxx.c
index 767fee2ab340..26019531db15 100644
--- a/drivers/rtc/rtc-stmp3xxx.c
+++ b/drivers/rtc/rtc-stmp3xxx.c
@@ -23,6 +23,7 @@
 #include <linux/init.h>
 #include <linux/platform_device.h>
 #include <linux/interrupt.h>
+#include <linux/delay.h>
 #include <linux/rtc.h>
 #include <linux/slab.h>
 #include <linux/of_device.h>
@@ -119,24 +120,39 @@ static void stmp3xxx_wdt_register(struct platform_device *rtc_pdev)
 }
 #endif /* CONFIG_STMP3XXX_RTC_WATCHDOG */
 
-static void stmp3xxx_wait_time(struct stmp3xxx_rtc_data *rtc_data)
+static int stmp3xxx_wait_time(struct stmp3xxx_rtc_data *rtc_data)
 {
+        int timeout = 5000; /* 3ms according to i.MX28 Ref Manual */
         /*
-         * The datasheet doesn't say which way round the
-         * NEW_REGS/STALE_REGS bitfields go. In fact it's 0x1=P0,
-         * 0x2=P1, .., 0x20=P5, 0x40=ALARM, 0x80=SECONDS
+         * The i.MX28 Applications Processor Reference Manual, Rev. 1, 2010
+         * states:
+         * | The order in which registers are updated is
+         * | Persistent 0, 1, 2, 3, 4, 5, Alarm, Seconds.
+         * | (This list is in bitfield order, from LSB to MSB, as they would
+         * | appear in the STALE_REGS and NEW_REGS bitfields of the HW_RTC_STAT
+         * | register. For example, the Seconds register corresponds to
+         * | STALE_REGS or NEW_REGS containing 0x80.)
          */
-        while (readl(rtc_data->io + STMP3XXX_RTC_STAT) &
-                        (0x80 << STMP3XXX_RTC_STAT_STALE_SHIFT))
-                cpu_relax();
+        do {
+                if (!(readl(rtc_data->io + STMP3XXX_RTC_STAT) &
+                                (0x80 << STMP3XXX_RTC_STAT_STALE_SHIFT)))
+                        return 0;
+                udelay(1);
+        } while (--timeout > 0);
+        return (readl(rtc_data->io + STMP3XXX_RTC_STAT) &
+                (0x80 << STMP3XXX_RTC_STAT_STALE_SHIFT)) ? -ETIME : 0;
 }
 
 /* Time read/write */
 static int stmp3xxx_rtc_gettime(struct device *dev, struct rtc_time *rtc_tm)
 {
+        int ret;
         struct stmp3xxx_rtc_data *rtc_data = dev_get_drvdata(dev);
 
-        stmp3xxx_wait_time(rtc_data);
+        ret = stmp3xxx_wait_time(rtc_data);
+        if (ret)
+                return ret;
+
         rtc_time_to_tm(readl(rtc_data->io + STMP3XXX_RTC_SECONDS), rtc_tm);
         return 0;
 }
@@ -146,8 +162,7 @@ static int stmp3xxx_rtc_set_mmss(struct device *dev, unsigned long t)
         struct stmp3xxx_rtc_data *rtc_data = dev_get_drvdata(dev);
 
         writel(t, rtc_data->io + STMP3XXX_RTC_SECONDS);
-        stmp3xxx_wait_time(rtc_data);
-        return 0;
+        return stmp3xxx_wait_time(rtc_data);
 }
 
 /* interrupt(s) handler */