Groups | Search | Server Info | Keyboard shortcuts | Login | Register [http] [https] [nntp] [nntps]

Groups > linux.kernel > #1345335

[PATCH] jz4740-battery: Correct voltage change check

Show all headers | View raw

The check is supposed to avoid redundant update notifications, so it
should check for the difference between old and new voltage exceeding
a threshold.

Also make sure the result of a failed read is never stored.

Signed-off-by: Maarten ter Huurne <maarten@treewalker.org>
---
 drivers/power/jz4740-battery.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/power/jz4740-battery.c b/drivers/power/jz4740-battery.c
index abdfc21..88f04f4 100644
--- a/drivers/power/jz4740-battery.c
+++ b/drivers/power/jz4740-battery.c
@@ -208,7 +208,7 @@ static void jz_battery_update(struct jz_battery *jz_battery)
 	}
 
 	voltage = jz_battery_read_voltage(jz_battery);
-	if (abs(voltage - jz_battery->voltage) < 50000) {
+	if (voltage >= 0 && abs(voltage - jz_battery->voltage) > 50000) {
 		jz_battery->voltage = voltage;
 		has_changed = true;
 	}
-- 
2.6.2

Back to linux.kernel | Previous | Next — Next in thread | Find similar | Unroll thread

Thread

[PATCH] jz4740-battery: Correct voltage change check Maarten ter Huurne <maarten@treewalker.org> - 2016-02-28 17:10 +0100
  Re: [PATCH] jz4740-battery: Correct voltage change check Sebastian Reichel <sre@kernel.org> - 2016-03-03 15:30 +0100

csiph-web