i2c: sun6i-p2wi: Prevent potential division by zero

[ 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@ingics.com>
Acked-by: Boris Brezillon <boris.brezillon@free-electrons.com>
Signed-off-by: Wolfram Sang <wsa@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>

diff --git a/drivers/i2c/busses/i2c-sun6i-p2wi.c b/drivers/i2c/busses/i2c-sun6i-p2wi.c
index fa6020d..85e035e 100644 (file)
--- a/drivers/i2c/busses/i2c-sun6i-p2wi.c
+++ b/drivers/i2c/busses/i2c-sun6i-p2wi.c
@@ -201,6 +201,11 @@ 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;