[PATCH AUTOSEL 4.14] i2c: sun6i-p2wi: Prevent potential division by zero

From: Sasha Levin
Date: Sun Nov 12 2023 - 08:25:58 EST


From: Axel Lin <axel.lin@xxxxxxxxxx>

[ Upstream commit 5ac61d26b8baff5b2e5a9f3dc1ef63297e4b53e7 ]

Make sure we don't OOPS in case clock-frequency is set to 0 in a DT. The
variable set here is later used as a divisor.

Signed-off-by: Axel Lin <axel.lin@xxxxxxxxxx>
Acked-by: Boris Brezillon <boris.brezillon@xxxxxxxxxxxxxxxxxx>
Signed-off-by: Wolfram Sang <wsa@xxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
---
drivers/i2c/busses/i2c-sun6i-p2wi.c | 5 +++++
1 file changed, 5 insertions(+)

diff --git a/drivers/i2c/busses/i2c-sun6i-p2wi.c b/drivers/i2c/busses/i2c-sun6i-p2wi.c
index 7c07ce116e384..540c33f4e3500 100644
--- a/drivers/i2c/busses/i2c-sun6i-p2wi.c
+++ b/drivers/i2c/busses/i2c-sun6i-p2wi.c
@@ -202,6 +202,11 @@ static int p2wi_probe(struct platform_device *pdev)
return -EINVAL;
}

+ if (clk_freq == 0) {
+ dev_err(dev, "clock-frequency is set to 0 in DT\n");
+ return -EINVAL;
+ }
+
if (of_get_child_count(np) > 1) {
dev_err(dev, "P2WI only supports one slave device\n");
return -EINVAL;
--
2.42.0