diff options
| author | Heiko Stuebner <heiko@sntech.de> | 2011-10-14 08:08:56 +0200 |
|---|---|---|
| committer | Kukjin Kim <kgene.kim@samsung.com> | 2011-10-14 08:15:52 +0200 |
| commit | f9f7c7503f7002deffe4cb8409ccada075a52522 (patch) | |
| tree | 6613230fdc583300e66be800d9debd0b38890052 /arch/arm/plat-s3c24xx | |
| parent | ARM: S3C2443: Add get_rate operation for clk_armdiv (diff) | |
| download | linux-f9f7c7503f7002deffe4cb8409ccada075a52522.tar.xz linux-f9f7c7503f7002deffe4cb8409ccada075a52522.zip | |
ARM: S3C2443: handle unset armdiv values gracefully
The armdiv array may contain unset divider values.
Check the relevant value to prevent division by zero
errors. Also check for set nr_armdiv and armdivmask
before meddling with clkdiv0.
Signed-off-by: Heiko Stuebner <heiko@sntech.de>
Signed-off-by: Kukjin Kim <kgene.kim@samsung.com>
Diffstat (limited to 'arch/arm/plat-s3c24xx')
| -rw-r--r-- | arch/arm/plat-s3c24xx/s3c2443-clock.c | 27 |
1 files changed, 20 insertions, 7 deletions
diff --git a/arch/arm/plat-s3c24xx/s3c2443-clock.c b/arch/arm/plat-s3c24xx/s3c2443-clock.c index fea3d5c0252e..31f97f1bb363 100644 --- a/arch/arm/plat-s3c24xx/s3c2443-clock.c +++ b/arch/arm/plat-s3c24xx/s3c2443-clock.c @@ -179,11 +179,16 @@ static unsigned long s3c2443_armclk_roundrate(struct clk *clk, unsigned div; int ptr; + if (!nr_armdiv) + return -EINVAL; + for (ptr = 0; ptr < nr_armdiv; ptr++) { div = armdiv[ptr]; - calc = parent / div; - if (calc <= rate && div < best) - best = div; + if (div) { + calc = parent / div; + if (calc <= rate && div < best) + best = div; + } } return parent / best; @@ -195,6 +200,9 @@ static unsigned long s3c2443_armclk_getrate(struct clk *clk) unsigned long clkcon0; int val; + if (!nr_armdiv || !armdivmask) + return -EINVAL; + clkcon0 = __raw_readl(S3C2443_CLKDIV0); clkcon0 &= armdivmask; val = clkcon0 >> S3C2443_CLKDIV0_ARMDIV_SHIFT; @@ -211,12 +219,17 @@ static int s3c2443_armclk_setrate(struct clk *clk, unsigned long rate) int ptr; int val = -1; + if (!nr_armdiv || !armdivmask) + return -EINVAL; + for (ptr = 0; ptr < nr_armdiv; ptr++) { div = armdiv[ptr]; - calc = parent / div; - if (calc <= rate && div < best) { - best = div; - val = ptr; + if (div) { + calc = parent / div; + if (calc <= rate && div < best) { + best = div; + val = ptr; + } } } |