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clk: vt8500: Fix division-by-0 when requested rate=0

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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 <linux@prisktech.co.nz>
Signed-off-by: Mike Turquette <mturquette@linaro.org>
This commit is contained in:
Tony Prisk 2012-12-27 13:14:31 +13:00 committed by Mike Turquette
parent 72480014b8
commit 58eb5a6763
1 changed files with 12 additions and 2 deletions
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14
drivers/clk/clk-vt8500.c
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@ -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++;