From: Axel Lin <axel.lin@ingics.com>
Date: Wed, 13 Apr 2016 00:54:30 +0000 (+0800)
Subject: i2c: sun6i-p2wi: Prevent potential division by zero
X-Git-Tag: v4.14.331~32
X-Git-Url: http://git.ipfire.org/?a=commitdiff_plain;h=807828f053f251c65452614a5bd47cd6eae67baf;p=thirdparty%2Fkernel%2Fstable.git

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 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;