power: supply: bq27xxx_battery: don't update poll_interval param if same

To avoid canceling the delayed workqueue needlessly, and scheduling an
immediate polling. Check if the new poll_interval value is different
than the previous setting.

Cc: Tony Lindgren <tony@atomide.com>
Cc: Sebastian Reichel <sre@kernel.org>
Signed-off-by: Matt Ranostay <matt@ranostay.consulting>
Signed-off-by: Sebastian Reichel <sre@kernel.org>

1 files changed, 2 insertions, 1 deletions

diff --git a/drivers/power/supply/bq27xxx_battery.c b/drivers/power/supply/bq27xxx_battery.c
index 3b0dbc689d72..0c343a0c941e 100644
--- a/drivers/power/supply/bq27xxx_battery.c
+++ b/drivers/power/supply/bq27xxx_battery.c
@@ -397,10 +397,11 @@ static LIST_HEAD(bq27xxx_battery_devices);
 static int poll_interval_param_set(const char *val, const struct kernel_param *kp)
 {
         struct bq27xxx_device_info *di;
+        unsigned int prev_val = *(unsigned int *) kp->arg;
         int ret;
 
         ret = param_set_uint(val, kp);
-        if (ret < 0)
+        if (ret < 0 || prev_val == *(unsigned int *) kp->arg)
                 return ret;
 
         mutex_lock(&bq27xxx_list_lock);