From: Sasha Levin <sashal@kernel.org>
To: linux-kernel@vger.kernel.org, stable@vger.kernel.org
Cc: Andreas Kemnade <andreas@kemnade.info>,
Sebastian Reichel <sebastian.reichel@collabora.com>,
Sasha Levin <sashal@kernel.org>,
linux-pm@vger.kernel.org
Subject: [PATCH AUTOSEL 4.14 017/109] power: supply: twl4030_charger: fix charging current out-of-bounds
Date: Sat, 9 Nov 2019 21:44:09 -0500 [thread overview]
Message-ID: <20191110024541.31567-17-sashal@kernel.org> (raw)
In-Reply-To: <20191110024541.31567-1-sashal@kernel.org>
From: Andreas Kemnade <andreas@kemnade.info>
[ Upstream commit 8314c212f995bc0d06b54ad02ef0ab4089781540 ]
the charging current uses unsigned int variables, if we step back
if the current is still low, we would run into negative which
means setting the target to a huge value.
Better add checks here.
Signed-off-by: Andreas Kemnade <andreas@kemnade.info>
Signed-off-by: Sebastian Reichel <sebastian.reichel@collabora.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
drivers/power/supply/twl4030_charger.c | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)
diff --git a/drivers/power/supply/twl4030_charger.c b/drivers/power/supply/twl4030_charger.c
index 0cc12bfe7b020..d3cba954bab54 100644
--- a/drivers/power/supply/twl4030_charger.c
+++ b/drivers/power/supply/twl4030_charger.c
@@ -420,7 +420,8 @@ static void twl4030_current_worker(struct work_struct *data)
if (v < USB_MIN_VOLT) {
/* Back up and stop adjusting. */
- bci->usb_cur -= USB_CUR_STEP;
+ if (bci->usb_cur >= USB_CUR_STEP)
+ bci->usb_cur -= USB_CUR_STEP;
bci->usb_cur_target = bci->usb_cur;
} else if (bci->usb_cur >= bci->usb_cur_target ||
bci->usb_cur + USB_CUR_STEP > USB_MAX_CURRENT) {
--
2.20.1
next prev parent reply other threads:[~2019-11-10 3:06 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <20191110024541.31567-1-sashal@kernel.org>
2019-11-10 2:44 ` [PATCH AUTOSEL 4.14 015/109] OPP: Protect dev_list with opp_table lock Sasha Levin
2019-11-10 2:44 ` Sasha Levin [this message]
2019-11-10 2:44 ` [PATCH AUTOSEL 4.14 018/109] power: supply: twl4030_charger: disable eoc interrupt on linear charge Sasha Levin
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