pinctrl: zte: fix dereference of 'data' in zx_set_mux()

It fixes the following Smatch complaint:

drivers/pinctrl/zte/pinctrl-zx.c:76 zx_set_mux()
warn: variable dereferenced before check 'data' (see line 67)

Reported-by: Dan Carpenter <dan.carpenter@oracle.com>
Fixes: cbff0c4d27f4 ("pinctrl: add ZTE ZX pinctrl driver support")
Signed-off-by: Shawn Guo <shawn.guo@linaro.org>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>

diff --git a/drivers/pinctrl/zte/pinctrl-zx.c b/drivers/pinctrl/zte/pinctrl-zx.c
index 787e3967bd5c5741aeb7a2cb96c18e38901092ed..f828ee340a98238052448d15a5f7604c286926dd 100644 (file)
--- a/drivers/pinctrl/zte/pinctrl-zx.c
+++ b/drivers/pinctrl/zte/pinctrl-zx.c
@@ -64,10 +64,8 @@ static int zx_set_mux(struct pinctrl_dev *pctldev, unsigned int func_selector,
        struct zx_pinctrl_soc_info *info = zpctl->info;
        const struct pinctrl_pin_desc *pindesc = info->pins + group_selector;
        struct zx_pin_data *data = pindesc->drv_data;
-       struct zx_mux_desc *mux = data->muxes;
-       u32 mask = (1 << data->width) - 1;
-       u32 offset = data->offset;
-       u32 bitpos = data->bitpos;
+       struct zx_mux_desc *mux;
+       u32 mask, offset, bitpos;
        struct function_desc *func;
        unsigned long flags;
        u32 val, mval;
@@ -76,6 +74,11 @@ static int zx_set_mux(struct pinctrl_dev *pctldev, unsigned int func_selector,
        if (!data)
                return -EINVAL;
 
+       mux = data->muxes;
+       mask = (1 << data->width) - 1;
+       offset = data->offset;
+       bitpos = data->bitpos;
+
        func = pinmux_generic_get_function(pctldev, func_selector);
        if (!func)
                return -EINVAL;