diff options
| author |   Tony Prisk <linux@prisktech.co.nz> | 2012-12-27 13:14:31 +1300 |
|---|---|---|
| committer |   Mike Turquette <mturquette@linaro.org> | 2013-01-15 16:16:25 -0800 |
| commit | 58eb5a6763deab71208fbff15b09055fac884b11 (patch) | |
| tree | bb5391c140cda7c3c6675f02380f88bbe6babd95 /drivers/clk | |
| parent | clk: vt8500: Fix device clock divisor calculations (diff) | |
| download | linux-dev-58eb5a6763deab71208fbff15b09055fac884b11.tar.xz linux-dev-58eb5a6763deab71208fbff15b09055fac884b11.zip | |
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 <linux@prisktech.co.nz>
Signed-off-by: Mike Turquette <mturquette@linaro.org>
Diffstat (limited to 'drivers/clk')
| -rw-r--r-- | drivers/clk/clk-vt8500.c | 14 |
1 files changed, 12 insertions, 2 deletions
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++; |