This is a note to let you know that I've just added the patch titled
i2c: sun6i-p2wi: Prevent potential division by zero
to the 4.19-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
i2c-sun6i-p2wi-prevent-potential-division-by-zero.patch
and it can be found in the queue-4.19 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
commit 1df93a5846aa446887a5fd5a83e8ef5eddcd3ba6
Author: Axel Lin <axel.lin@xxxxxxxxxx>
Date: Wed Apr 13 08:54:30 2016 +0800
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@xxxxxxxxxx>
Acked-by: Boris Brezillon <boris.brezillon@xxxxxxxxxxxxxxxxxx>
Signed-off-by: Wolfram Sang <wsa@xxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
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;
