[PATCH 6.1 142/321] hwmon: (ltc2992) Avoid division by zero

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6.1-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Antoniu Miclaus <antoniu.miclaus@xxxxxxxxxx>

[ Upstream commit 10b02902048737f376104bc69e5212466e65a542 ]

Do not allow setting shunt resistor to 0. This results in a division by
zero when performing current value computations based on input voltages
and connected resistor values.

Signed-off-by: Antoniu Miclaus <antoniu.miclaus@xxxxxxxxxx>
Link: https://lore.kernel.org/r/20231011135754.13508-1-antoniu.miclaus@xxxxxxxxxx
Signed-off-by: Guenter Roeck <linux@xxxxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
---
 drivers/hwmon/ltc2992.c | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/drivers/hwmon/ltc2992.c b/drivers/hwmon/ltc2992.c
index d88e883c7492c..984748f36594d 100644
--- a/drivers/hwmon/ltc2992.c
+++ b/drivers/hwmon/ltc2992.c
@@ -875,8 +875,12 @@ static int ltc2992_parse_dt(struct ltc2992_state *st)
 		}
 
 		ret = fwnode_property_read_u32(child, "shunt-resistor-micro-ohms", &val);
-		if (!ret)
+		if (!ret) {
+			if (!val)
+				return dev_err_probe(&st->client->dev, -EINVAL,
+						     "shunt resistor value cannot be zero\n");
 			st->r_sense_uohm[addr] = val;
+		}
 	}
 
 	return 0;
-- 
2.43.0







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