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clk: at91: generated: Truncate divisor to GENERATED_MAX_DIV + 1

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[ Upstream commit 1573eebeaa ]

In clk_generated_determine_rate(), if the divisor is greater than
GENERATED_MAX_DIV + 1, then the wrong best_rate will be returned.
If clk_generated_set_rate() will be called later with this wrong
rate, it will return -EINVAL, so the generated clock won't change
its value. Do no let the divisor be greater than GENERATED_MAX_DIV + 1.

Fixes: 8c7aa63289 ("clk: at91: clk-generated: remove useless divisor loop")
Signed-off-by: Codrin Ciubotariu <codrin.ciubotariu@microchip.com>
Acked-by: Nicolas Ferre <nicolas.ferre@microchip.com>
Acked-by: Ludovic Desroches <ludovic.desroches@microchip.com>
Signed-off-by: Stephen Boyd <sboyd@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Codrin Ciubotariu 2019-06-25 12:10:02 +03:00 committed by Greg Kroah-Hartman
parent 28fd9b37b6
commit 3e5f29b666
1 changed files with 2 additions and 0 deletions
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2
drivers/clk/at91/clk-generated.c
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@ -153,6 +153,8 @@ static int clk_generated_determine_rate(struct clk_hw *hw,
continue;
div = DIV_ROUND_CLOSEST(parent_rate, req->rate);
if (div > GENERATED_MAX_DIV + 1)
div = GENERATED_MAX_DIV + 1;
clk_generated_best_diff(req, parent, parent_rate, div,
&best_diff, &best_rate);