korg/linux
0
0
Fork 0
mirror of https://mirrors.bfsu.edu.cn/git/linux.git synced 2024-12-20 09:34:44 +08:00
Code Issues Packages Projects Releases Wiki Activity

clk: at91: clk-master: check if div or pres is zero

Browse Source 
Check if div or pres is zero before using it as argument for ffs().
In case div is zero ffs() will return 0 and thus substracting from
zero will lead to invalid values to be setup in registers.

Fixes: 7a110b9107 ("clk: at91: clk-master: re-factor master clock")
Fixes: 75c88143f3 ("clk: at91: clk-master: add master clock support for SAMA7G5")
Signed-off-by: Claudiu Beznea <claudiu.beznea@microchip.com>
Link: https://lore.kernel.org/r/20211011112719.3951784-9-claudiu.beznea@microchip.com
Acked-by: Nicolas Ferre <nicolas.ferre@microchip.com>
Signed-off-by: Stephen Boyd <sboyd@kernel.org>
This commit is contained in:
Claudiu Beznea 2021-10-11 14:27:12 +03:00 committed by Stephen Boyd
parent f12d028b74
commit c2910c00fe
1 changed files with 2 additions and 2 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

4
drivers/clk/at91/clk-master.c
View File

@ -344,7 +344,7 @@ static int clk_master_pres_set_rate(struct clk_hw *hw, unsigned long rate,
else if (pres == 3)
pres = MASTER_PRES_MAX;
else
else if (pres)
pres = ffs(pres) - 1;
spin_lock_irqsave(master->lock, flags);
@ -757,7 +757,7 @@ static int clk_sama7g5_master_set_rate(struct clk_hw *hw, unsigned long rate,
if (div == 3)
div = MASTER_PRES_MAX;
else
else if (div)
div = ffs(div) - 1;
spin_lock_irqsave(master->lock, flags);