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[PATCH-for-5.2,3/3] hw/clock: Only propagate clock changes if the clock is changed

Message ID 20200806123858.30058-4-f4bug@amsat.org
State New
Headers show
Series [PATCH-for-5.2,1/3] hw/clock: Remove unused clock_init*() functions | expand

Commit Message

Philippe Mathieu-Daudé Aug. 6, 2020, 12:38 p.m. UTC 
Avoid propagating the clock change when the clock does not change.

Signed-off-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
---
 include/hw/clock.h | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)
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Patch

diff --git a/include/hw/clock.h b/include/hw/clock.h
index d85af45c96..9ecd78b2c3 100644
--- a/include/hw/clock.h
+++ b/include/hw/clock.h
@@ -165,8 +165,9 @@  void clock_propagate(Clock *clk);
  */
 static inline void clock_update(Clock *clk, uint64_t value)
 {
-    clock_set(clk, value);
-    clock_propagate(clk);
+    if (clock_set(clk, value)) {
+        clock_propagate(clk);
+    }
 }
 
 static inline void clock_update_hz(Clock *clk, unsigned hz)