linux-kernel - [PATCH v5 2/8] power: ip5xxx_power: Fix return value on ADC read errors

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Message-ID: <20241119180741.2237692-2-csokas.bence@prolan.hu>
Date: Tue, 19 Nov 2024 19:07:34 +0100
From: Csókás, Bence <csokas.bence@...lan.hu>
To: Sebastian Reichel <sebastian.reichel@...labora.com>, Samuel Holland
	<samuel@...lland.org>, <linux-pm@...r.kernel.org>,
	<linux-kernel@...r.kernel.org>
CC: Csókás, Bence <csokas.bence@...lan.hu>,
	Sebastian Reichel <sre@...nel.org>
Subject: [PATCH v5 2/8] power: ip5xxx_power: Fix return value on ADC read errors

If ADC read returns an error, the return value was silently ignored,
execution continued and an uninitialized value and a return code of 0
was passed back to userspace. The only exception was
POWER_SUPPLY_PROP_CONSTANT_CHARGE_CURRENT, which bailed out correctly.
Fix returns for the other cases as well.

Fixes: 75853406fa27 ("power: supply: Add a driver for Injoinic power bank ICs")

Signed-off-by: Csókás, Bence <csokas.bence@...lan.hu>
---
 drivers/power/supply/ip5xxx_power.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/drivers/power/supply/ip5xxx_power.c b/drivers/power/supply/ip5xxx_power.c
index 2d4435881a9e..41d91504eb32 100644
--- a/drivers/power/supply/ip5xxx_power.c
+++ b/drivers/power/supply/ip5xxx_power.c
@@ -395,18 +395,24 @@ static int ip5xxx_battery_get_property(struct power_supply *psy,
 
 	case POWER_SUPPLY_PROP_VOLTAGE_NOW:
 		ret = ip5xxx_battery_read_adc(ip5xxx, &ip5xxx->regs.battery.adc.volt, &raw);
+		if (ret)
+			return ret;
 
 		val->intval = 2600000 + DIV_ROUND_CLOSEST(raw * 26855, 100);
 		return 0;
 
 	case POWER_SUPPLY_PROP_VOLTAGE_OCV:
 		ret = ip5xxx_battery_read_adc(ip5xxx, &ip5xxx->regs.battery.adc.open_volt, &raw);
+		if (ret)
+			return ret;
 
 		val->intval = 2600000 + DIV_ROUND_CLOSEST(raw * 26855, 100);
 		return 0;
 
 	case POWER_SUPPLY_PROP_CURRENT_NOW:
 		ret = ip5xxx_battery_read_adc(ip5xxx, &ip5xxx->regs.battery.adc.curr, &raw);
+		if (ret)
+			return ret;
 
 		val->intval = DIV_ROUND_CLOSEST(raw * 149197, 200);
 		return 0;
-- 
2.34.1