i2c: sh_mobile: bail out on errors when initializing

sh_mobile_i2c_init() could detect wrong settings, but didn't bail out,
so it would continue unconfigured. Fix this.

Signed-off-by: Wolfram Sang <wsa+renesas@sang-engineering.com>
Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
(cherry picked from commit 6ed7053c2255c34886297b995c6a18607b36d668)
Signed-off-by: Simon Horman <horms+renesas@verge.net.au>

diff --git a/drivers/i2c/busses/i2c-sh_mobile.c b/drivers/i2c/busses/i2c-sh_mobile.c
index 9a5b693..9f02013 100644 (file)
--- a/drivers/i2c/busses/i2c-sh_mobile.c
+++ b/drivers/i2c/busses/i2c-sh_mobile.c
@@ -228,7 +228,7 @@ static u32 sh_mobile_i2c_icch(unsigned long count_khz, u32 tHIGH, u32 tf)
        return (((count_khz * (tHIGH + tf)) + 5000) / 10000);
 }
 
-static void sh_mobile_i2c_init(struct sh_mobile_i2c_data *pd)
+static int sh_mobile_i2c_init(struct sh_mobile_i2c_data *pd)
 {
        unsigned long i2c_clk_khz;
        u32 tHIGH, tLOW, tf;
@@ -236,6 +236,7 @@ static void sh_mobile_i2c_init(struct sh_mobile_i2c_data *pd)
        /* Get clock rate after clock is enabled */
        clk_prepare_enable(pd->clk);
        i2c_clk_khz = clk_get_rate(pd->clk) / 1000;
+       clk_disable_unprepare(pd->clk);
        i2c_clk_khz /= pd->clks_per_count;
 
        if (pd->bus_speed == STANDARD_MODE) {
@@ -249,7 +250,7 @@ static void sh_mobile_i2c_init(struct sh_mobile_i2c_data *pd)
        } else {
                dev_err(pd->dev, "unrecognized bus speed %lu Hz\n",
                        pd->bus_speed);
-               goto out;
+               return -EINVAL;
        }
 
        pd->iccl = sh_mobile_i2c_iccl(i2c_clk_khz, tLOW, tf);
@@ -266,8 +267,7 @@ static void sh_mobile_i2c_init(struct sh_mobile_i2c_data *pd)
        else
                pd->icic &= ~ICIC_ICCHB8;
 
-out:
-       clk_disable_unprepare(pd->clk);
+       return 0;
 }
 
 static void activate_ch(struct sh_mobile_i2c_data *pd)
@@ -677,7 +677,9 @@ static int sh_mobile_i2c_probe(struct platform_device *dev)
        if (resource_size(res) > 0x17)
                pd->flags |= IIC_FLAG_HAS_ICIC67;
 
-       sh_mobile_i2c_init(pd);
+       ret = sh_mobile_i2c_init(pd);
+       if (ret)
+               return ret;
 
        /* Enable Runtime PM for this device.
         *