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authorArnd Bergmann <arnd@arndb.de>2016-11-16 17:18:18 +0300
committerLinus Walleij <linus.walleij@linaro.org>2016-11-16 22:53:48 +0300
commitd8a22212737314cc02692cc90eda7d844fa20257 (patch)
tree8bb1de334f049cce085715895ca626b6b4b6bbcf /drivers/pinctrl/sunxi
parentd278dae88428d61623590269e5d782264f2ac2f8 (diff)
downloadlinux-d8a22212737314cc02692cc90eda7d844fa20257.tar.xz
pinctrl: sunxi: fix theoretical uninitialized variable access
gcc warns about a way that it could use an uninitialized variable: drivers/pinctrl/sunxi/pinctrl-sunxi.c: In function 'sunxi_pinctrl_init': drivers/pinctrl/sunxi/pinctrl-sunxi.c:1191:8: error: 'best_div' may be used uninitialized in this function [-Werror=maybe-uninitialized] This cannot really happen except if 'freq' is UINT_MAX and 'clock' is zero, and both of these are forbidden. To shut up the warning anyway, this changes the logic to initialize the return code to the first divider value before looking at the others. Fixes: 7c926492d38a ("pinctrl: sunxi: Add support for interrupt debouncing") Signed-off-by: Arnd Bergmann <arnd@arndb.de> Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Diffstat (limited to 'drivers/pinctrl/sunxi')
-rw-r--r--drivers/pinctrl/sunxi/pinctrl-sunxi.c7
1 files changed, 5 insertions, 2 deletions
diff --git a/drivers/pinctrl/sunxi/pinctrl-sunxi.c b/drivers/pinctrl/sunxi/pinctrl-sunxi.c
index 2339d4718b4d..6b7953da4228 100644
--- a/drivers/pinctrl/sunxi/pinctrl-sunxi.c
+++ b/drivers/pinctrl/sunxi/pinctrl-sunxi.c
@@ -1125,10 +1125,13 @@ static int sunxi_pinctrl_build_state(struct platform_device *pdev)
static int sunxi_pinctrl_get_debounce_div(struct clk *clk, int freq, int *diff)
{
unsigned long clock = clk_get_rate(clk);
- unsigned int best_diff = ~0, best_div;
+ unsigned int best_diff, best_div;
int i;
- for (i = 0; i < 8; i++) {
+ best_diff = abs(freq - clock);
+ best_div = 0;
+
+ for (i = 1; i < 8; i++) {
int cur_diff = abs(freq - (clock >> i));
if (cur_diff < best_diff) {