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i2c: jz4780: prevent potential division by zero

Message ID 1459719125-27320-1-git-send-email-wsa@the-dreams.de
State Accepted
Headers show

Commit Message

Wolfram Sang April 3, 2016, 9:32 p.m. UTC 
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: Wolfram Sang <wsa@the-dreams.de>
---
 drivers/i2c/busses/i2c-jz4780.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
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Patch

diff --git a/drivers/i2c/busses/i2c-jz4780.c b/drivers/i2c/busses/i2c-jz4780.c
index f325663c27c532..597408fc6834fc 100644
--- a/drivers/i2c/busses/i2c-jz4780.c
+++ b/drivers/i2c/busses/i2c-jz4780.c
@@ -770,7 +770,7 @@  static int jz4780_i2c_probe(struct platform_device *pdev)
 
 	ret = of_property_read_u32(pdev->dev.of_node, "clock-frequency",
 				   &clk_freq);
-	if (ret) {
+	if (ret || clk_freq == 0) {
 		dev_err(&pdev->dev, "clock-frequency not specified in DT");
 		goto err;
 	}