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authorClaudiu Beznea <claudiu.beznea@microchip.com>2021-10-11 14:27:12 +0300
committerStephen Boyd <sboyd@kernel.org>2021-10-26 18:27:42 -0700
commitc2910c00fee4cbb7b222d6e02846adef9ae4135a (patch)
tree5f483a1072076e2fb3e54f999415fd261798b783 /drivers/clk/at91
parentf12d028b743bb6136da60b17228a1b6162886444 (diff)
clk: at91: clk-master: check if div or pres is zero
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: 7a110b9107ed8 ("clk: at91: clk-master: re-factor master clock") Fixes: 75c88143f3b87 ("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>
Diffstat (limited to 'drivers/clk/at91')
-rw-r--r--drivers/clk/at91/clk-master.c4
1 files changed, 2 insertions, 2 deletions
diff --git a/drivers/clk/at91/clk-master.c b/drivers/clk/at91/clk-master.c
index 9a2c8e64cacf..2093e13b5068 100644
--- a/drivers/clk/at91/clk-master.c
+++ b/drivers/clk/at91/clk-master.c
@@ -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);