[PATCH] i2c: sh_mobile: Handle return value of clk_prepare_enable

From: Arvind Yadav
Date: Thu May 25 2017 - 07:40:47 EST


clk_prepare_enable() can fail here and we must check its return value.

Signed-off-by: Arvind Yadav <arvind.yadav.cs@xxxxxxxxx>
---
drivers/i2c/busses/i2c-sh_mobile.c | 22 ++++++++++++++++++----
1 file changed, 18 insertions(+), 4 deletions(-)

diff --git a/drivers/i2c/busses/i2c-sh_mobile.c b/drivers/i2c/busses/i2c-sh_mobile.c
index 3d75593..a845292 100644
--- a/drivers/i2c/busses/i2c-sh_mobile.c
+++ b/drivers/i2c/busses/i2c-sh_mobile.c
@@ -252,9 +252,15 @@ static int sh_mobile_i2c_init(struct sh_mobile_i2c_data *pd)
unsigned long i2c_clk_khz;
u32 tHIGH, tLOW, tf;
uint16_t max_val;
+ int ret;

/* Get clock rate after clock is enabled */
- clk_prepare_enable(pd->clk);
+ ret = clk_prepare_enable(pd->clk);
+ if (ret) {
+ dev_err(pd->dev, "Failed! to enable clock\n");
+ return ret;
+ }
+
i2c_clk_khz = clk_get_rate(pd->clk) / 1000;
clk_disable_unprepare(pd->clk);
i2c_clk_khz /= pd->clks_per_count;
@@ -299,11 +305,14 @@ static int sh_mobile_i2c_init(struct sh_mobile_i2c_data *pd)
return 0;
}

-static void activate_ch(struct sh_mobile_i2c_data *pd)
+static int activate_ch(struct sh_mobile_i2c_data *pd)
{
+ int ret;
/* Wake up device and enable clock */
pm_runtime_get_sync(pd->dev);
- clk_prepare_enable(pd->clk);
+ ret = clk_prepare_enable(pd->clk);
+ if (ret)
+ return ret;

/* Enable channel and configure rx ack */
iic_set_clr(pd, ICCR, ICCR_ICE, 0);
@@ -314,6 +323,7 @@ static void activate_ch(struct sh_mobile_i2c_data *pd)
/* Set the clock */
iic_wr(pd, ICCL, pd->iccl & 0xff);
iic_wr(pd, ICCH, pd->icch & 0xff);
+ return 0;
}

static void deactivate_ch(struct sh_mobile_i2c_data *pd)
@@ -732,7 +742,11 @@ static int sh_mobile_i2c_xfer(struct i2c_adapter *adapter,
int i;
long timeout;

- activate_ch(pd);
+ err = activate_ch(pd);
+ if (err) {
+ dev_err(pd->dev, "Failed! to enable clock\n");
+ return err;
+ }

/* Process all messages */
for (i = 0; i < num; i++) {
--
1.9.1