From: Giulio Benetti <giulio.benetti@benettiengineering.com>
Date: Fri, 17 Jan 2020 12:06:41 +0000 (+0100)
Subject: clk: imx: pllv3: fix potential 'divide by zero' in av_get_rate()
X-Git-Tag: v2020.10~395^2~5
X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=d37ecaba88cc7482d9481a6ee7de84ff454ede4a;p=platform%2Fkernel%2Fu-boot.git

clk: imx: pllv3: fix potential 'divide by zero' in av_get_rate()

Guard 'mfd==0' to prevent 'divide by zero' issue in
clk_pplv3_av_get_rate(). If it is 0, let's return with EIO since mfd
should never be 0 at all.

Signed-off-by: Giulio Benetti <giulio.benetti@benettiengineering.com>
---

diff --git a/drivers/clk/imx/clk-pllv3.c b/drivers/clk/imx/clk-pllv3.c
index a540a5b..72e6750 100644
--- a/drivers/clk/imx/clk-pllv3.c
+++ b/drivers/clk/imx/clk-pllv3.c
@@ -163,6 +163,9 @@ static ulong clk_pllv3_av_get_rate(struct clk *clk)
 	u32 div = readl(pll->base) & pll->div_mask;
 	u64 temp64 = (u64)parent_rate;
 
+	if (mfd == 0)
+		return -EIO;
+
 	temp64 *= mfn;
 	do_div(temp64, mfd);