[Qemu-devel] [PATCH v5 1/2] hw/ptimer: Set delta to the original limit on reload in ptimer_set_limit()

[Dmitry Osipenko <digetx@gmail.com>]

ptimer_get_count() returns incorrect value for the disabled timer after
reloading the counter with a small value, because corrected limit value
is used instead of the original.

For instance:
    1) ptimer_stop(t)
    2) ptimer_set_period(t, 1)
    3) ptimer_set_limit(t, 0, 1)
    4) ptimer_get_count(t) <-- would return 10000 instead of 0

Signed-off-by: Dmitry Osipenko <digetx@gmail.com>
---
 hw/core/ptimer.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/hw/core/ptimer.c b/hw/core/ptimer.c
index 8437bd6..abc3a20 100644
--- a/hw/core/ptimer.c
+++ b/hw/core/ptimer.c
@@ -180,6 +180,8 @@ void ptimer_set_freq(ptimer_state *s, uint32_t freq)
    count = limit.  */
 void ptimer_set_limit(ptimer_state *s, uint64_t limit, int reload)
 {
+    uint64_t count = limit;
+
     /*
      * Artificially limit timeout rate to something
      * achievable under QEMU.  Otherwise, QEMU spends all
@@ -195,7 +197,7 @@ void ptimer_set_limit(ptimer_state *s, uint64_t limit, int reload)
 
     s->limit = limit;
     if (reload)
-        s->delta = limit;
+        s->delta = count;
     if (s->enabled && reload) {
         s->next_event = qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL);
         ptimer_reload(s);
-- 
2.6.0