[PATCH 1/5] clock: introduce non interruptible timeout

[Jean-Christophe PLAGNIOL-VILLARD <plagnioj@jcrosoft.com>]

is_timeout call poller_call if the timeout is >= 100us

but on 1-wire bus we need to wait 500us and not more than 930us
for the bus reset. So if the poller_call is caller we can not guarantee it.

So for this introduce is_non_interruptible_timeout than we only wait.

Use it for ndelay too.

Signed-off-by: Jean-Christophe PLAGNIOL-VILLARD <plagnioj@jcrosoft.com>
---
 common/clock.c  |   16 +++++++++++-----
 include/clock.h |    1 +
 2 files changed, 12 insertions(+), 5 deletions(-)

diff --git a/common/clock.c b/common/clock.c
index 8adbeaf..9c7c1ba 100644
--- a/common/clock.c
+++ b/common/clock.c
@@ -135,23 +135,29 @@ uint32_t clocksource_hz2mult(uint32_t hz, uint32_t shift_constant)
         return (uint32_t)tmp;
 }
 
-int is_timeout(uint64_t start_ns, uint64_t time_offset_ns)
+int is_timeout_non_interruptible(uint64_t start_ns, uint64_t time_offset_ns)
 {
-	if (time_offset_ns >= 100 * USECOND)
-		poller_call();
-
 	if ((int64_t)(start_ns + time_offset_ns - get_time_ns()) < 0)
 		return 1;
 	else
 		return 0;
 }
+EXPORT_SYMBOL(is_timeout_non_interruptible);
+
+int is_timeout(uint64_t start_ns, uint64_t time_offset_ns)
+{
+	if (time_offset_ns >= 100 * USECOND)
+		poller_call();
+
+	return is_timeout_non_interruptible(start_ns, time_offset_ns);
+}
 EXPORT_SYMBOL(is_timeout);
 
 void ndelay(unsigned long nsecs)
 {
 	uint64_t start = get_time_ns();
 
-	while(!is_timeout(start, nsecs));
+	while(!is_timeout_non_interruptible(start, nsecs));
 }
 EXPORT_SYMBOL(ndelay);
 
diff --git a/include/clock.h b/include/clock.h
index c01a8d0..a169790 100644
--- a/include/clock.h
+++ b/include/clock.h
@@ -32,6 +32,7 @@ void clocks_calc_mult_shift(uint32_t *mult, uint32_t *shift, uint32_t from, uint
 uint32_t clocksource_hz2mult(uint32_t hz, uint32_t shift_constant);
 
 int is_timeout(uint64_t start_ns, uint64_t time_offset_ns);
+int is_timeout_non_interruptible(uint64_t start_ns, uint64_t time_offset_ns);
 
 // void udelay(unsigned long usecs);
 
-- 
1.7.10.4


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