From: Tony Prisk Date: Thu, 27 Dec 2012 00:14:31 +0000 (+1300) Subject: clk: vt8500: Fix division-by-0 when requested rate=0 X-Git-Tag: v4.13~10153^2~15 X-Git-Url: https://git.proxmox.com/?a=commitdiff_plain;h=58eb5a6763deab71208fbff15b09055fac884b11;p=mirror_ubuntu-bionic-kernel.git clk: vt8500: Fix division-by-0 when requested rate=0 A request to vt8500_dclk_(round_rate/set_rate) with rate=0 results in a division-by-0 in the kernel. Signed-off-by: Tony Prisk Signed-off-by: Mike Turquette --- diff --git a/drivers/clk/clk-vt8500.c b/drivers/clk/clk-vt8500.c index 3306c2b1906c..db7d41f25046 100644 --- a/drivers/clk/clk-vt8500.c +++ b/drivers/clk/clk-vt8500.c @@ -121,7 +121,12 @@ static long vt8500_dclk_round_rate(struct clk_hw *hw, unsigned long rate, unsigned long *prate) { struct clk_device *cdev = to_clk_device(hw); - u32 divisor = *prate / rate; + u32 divisor; + + if (rate == 0) + return 0; + + divisor = *prate / rate; /* If prate / rate would be decimal, incr the divisor */ if (rate * divisor < *prate) @@ -142,9 +147,14 @@ static int vt8500_dclk_set_rate(struct clk_hw *hw, unsigned long rate, unsigned long parent_rate) { struct clk_device *cdev = to_clk_device(hw); - u32 divisor = parent_rate / rate; + u32 divisor; unsigned long flags = 0; + if (rate == 0) + return 0; + + divisor = parent_rate / rate; + /* If prate / rate would be decimal, incr the divisor */ if (rate * divisor < *prate) divisor++;