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clk: Don't write error code into divider register

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Add a check for error returned by divider value calculation to avoid
writing error code into hw register.

Signed-off-by: Alex Frid <afrid@nvidia.com>
Reviewed-by: Peter De Schrijver <pdeschrijver@nvidia.com>
Reviewed-by: Jon Mayo <jmayo@nvidia.com>
Fixes: bca9690b94 ("clk: divider: Make generic for usage elsewhere")
Signed-off-by: Stephen Boyd <sboyd@codeaurora.org>
This commit is contained in:
Alex Frid 2017-07-25 13:18:40 +03:00 committed by Stephen Boyd
parent 6c264416c9
commit 2316a7a334
1 changed files with 4 additions and 2 deletions
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6
drivers/clk/clk-divider.c
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@ -385,12 +385,14 @@ static int clk_divider_set_rate(struct clk_hw *hw, unsigned long rate,
unsigned long parent_rate) unsigned long parent_rate)
{ {
struct clk_divider *divider = to_clk_divider(hw); struct clk_divider *divider = to_clk_divider(hw);
unsigned int value; int value;
unsigned long flags = 0; unsigned long flags = 0;
u32 val; u32 val;
value = divider_get_val(rate, parent_rate, divider->table, value = divider_get_val(rate, parent_rate, divider->table,
divider->width, divider->flags); divider->width, divider->flags);
if (value < 0)
return value;
if (divider->lock) if (divider->lock)
spin_lock_irqsave(divider->lock, flags); spin_lock_irqsave(divider->lock, flags);
@ -403,7 +405,7 @@ static int clk_divider_set_rate(struct clk_hw *hw, unsigned long rate,
val = clk_readl(divider->reg); val = clk_readl(divider->reg);
val &= ~(div_mask(divider->width) << divider->shift); val &= ~(div_mask(divider->width) << divider->shift);
} }
val |= value << divider->shift; val |= (u32)value << divider->shift;
clk_writel(val, divider->reg); clk_writel(val, divider->reg);
if (divider->lock) if (divider->lock)