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Subject[PATCH v2 1/2] platform/x86: fujitsu-laptop: rework logolamp_set() to properly handle errors
Date
Potential errors returned by some call_fext_func() calls inside
logolamp_set() are currently ignored. Rework logolamp_set() to properly
handle them. This causes one more call_fext_func() call to be made in
the LED_OFF case, though one could argue that this is logically the
right thing to do (even though the extra call is not needed to shut the
LED off).

Signed-off-by: Michał Kępień <kernel@kempniu.pl>
---
Changes from v1:

- Decrease indentation by rearranging logical conditions.
- Split variable declarations into two lines.

drivers/platform/x86/fujitsu-laptop.c | 23 ++++++++++++++---------
1 file changed, 14 insertions(+), 9 deletions(-)

diff --git a/drivers/platform/x86/fujitsu-laptop.c b/drivers/platform/x86/fujitsu-laptop.c
index b725a907a91f..34b8481fb0ed 100644
--- a/drivers/platform/x86/fujitsu-laptop.c
+++ b/drivers/platform/x86/fujitsu-laptop.c
@@ -271,15 +271,20 @@ static int call_fext_func(int cmd, int arg0, int arg1, int arg2)
static int logolamp_set(struct led_classdev *cdev,
enum led_brightness brightness)
{
- if (brightness >= LED_FULL) {
- call_fext_func(FUNC_LEDS, 0x1, LOGOLAMP_POWERON, FUNC_LED_ON);
- return call_fext_func(FUNC_LEDS, 0x1, LOGOLAMP_ALWAYS, FUNC_LED_ON);
- } else if (brightness >= LED_HALF) {
- call_fext_func(FUNC_LEDS, 0x1, LOGOLAMP_POWERON, FUNC_LED_ON);
- return call_fext_func(FUNC_LEDS, 0x1, LOGOLAMP_ALWAYS, FUNC_LED_OFF);
- } else {
- return call_fext_func(FUNC_LEDS, 0x1, LOGOLAMP_POWERON, FUNC_LED_OFF);
- }
+ int poweron = FUNC_LED_ON, always = FUNC_LED_ON;
+ int ret;
+
+ if (brightness < LED_HALF)
+ poweron = FUNC_LED_OFF;
+
+ if (brightness < LED_FULL)
+ always = FUNC_LED_OFF;
+
+ ret = call_fext_func(FUNC_LEDS, 0x1, LOGOLAMP_POWERON, poweron);
+ if (ret < 0)
+ return ret;
+
+ return call_fext_func(FUNC_LEDS, 0x1, LOGOLAMP_ALWAYS, always);
}

static int kblamps_set(struct led_classdev *cdev,
--
2.11.0
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