提交 f9f7c750 编写于 作者: H Heiko Stuebner 提交者: Kukjin Kim

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: NHeiko Stuebner <heiko@sntech.de>
Signed-off-by: NKukjin Kim <kgene.kim@samsung.com>
上级 5f33bd76
......@@ -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;
}
}
}
......
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