redonkable
/
alistair23-linux
1
0
Fork 0
Code Releases Activity

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

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>
alistair/sunxi64-5.4-dsi
Codrin Ciubotariu 2019-06-25 12:10:02 +03:00 committed by Stephen Boyd
parent 5f9e832c13
commit 1573eebeaa
1 changed files with 2 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
drivers/clk/at91/clk-generated.c
View File

@ -141,6 +141,8 @@ 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);