linux-kernel - [PATCH] HID: logitech-hidpp: initialize level variable

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Date:   Fri,  7 May 2021 12:18:19 -0700
From:   trix@...hat.com
To:     jikos@...nel.org, benjamin.tissoires@...hat.com,
        pedro@...rovanzella.com
Cc:     linux-input@...r.kernel.org, linux-kernel@...r.kernel.org,
        Tom Rix <trix@...hat.com>
Subject: [PATCH] HID: logitech-hidpp: initialize level variable

From: Tom Rix <trix@...hat.com>

Static analysis reports this representative problem

hid-logitech-hidpp.c:1356:23: warning: Assigned value is
  garbage or undefined
        hidpp->battery.level = level;
                             ^ ~~~~~

In some cases, 'level' is never set in hidpp20_battery_map_status_voltage()
Since level is not available on all hw, initialize level to unknown.

Fixes: be281368f297 ("hid-logitech-hidpp: read battery voltage from newer devices")
Signed-off-by: Tom Rix <trix@...hat.com>
---
 drivers/hid/hid-logitech-hidpp.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/hid/hid-logitech-hidpp.c b/drivers/hid/hid-logitech-hidpp.c
index 69670ca7e1e1..61635e629469 100644
--- a/drivers/hid/hid-logitech-hidpp.c
+++ b/drivers/hid/hid-logitech-hidpp.c
@@ -1265,6 +1265,7 @@ static int hidpp20_battery_map_status_voltage(u8 data[3], int *voltage,
 	int status;
 
 	long flags = (long) data[2];
+	*level = POWER_SUPPLY_CAPACITY_LEVEL_UNKNOWN;
 
 	if (flags & 0x80)
 		switch (flags & 0x07) {
-- 
2.26.3