[PATCH V2] opp: Don't ignore clk_get() errors other than -ENOENT

[Viresh Kumar]

Not all devices that need to use OPP core need to have clocks, a missing
clock is fine in which case -ENOENT shall be returned by clk_get().

Anything else is an error and must be handled properly.

Reported-by: Dmitry Osipenko <dig...@gmail.com>
Signed-off-by: Viresh Kumar <viresh.ku...@linaro.org>
---
V2:
- s/ENODEV/ENOENT
- Use dev_err_probe()

Stephen, is the understanding correct that -ENOENT is the only error
returned for missing clocks ?

 drivers/opp/core.c | 17 ++++++++++-------
 1 file changed, 10 insertions(+), 7 deletions(-)

diff --git a/drivers/opp/core.c b/drivers/opp/core.c
index a518173fd64a..0beb3ee79523 100644
--- a/drivers/opp/core.c
+++ b/drivers/opp/core.c
@@ -1252,6 +1252,8 @@ static struct opp_table *_update_opp_table_clk(struct 
device *dev,
                                               struct opp_table *opp_table,
                                               bool getclk)
 {
+       int ret;
+
        /*
         * Return early if we don't need to get clk or we have already tried it
         * earlier.
@@ -1261,18 +1263,19 @@ static struct opp_table *_update_opp_table_clk(struct 
device *dev,
 
        /* Find clk for the device */
        opp_table->clk = clk_get(dev, NULL);
-       if (IS_ERR(opp_table->clk)) {
-               int ret = PTR_ERR(opp_table->clk);
 
-               if (ret == -EPROBE_DEFER) {
-                       dev_pm_opp_put_opp_table(opp_table);
-                       return ERR_PTR(ret);
-               }
+       ret = PTR_ERR_OR_ZERO(opp_table->clk);
+       if (!ret)
+               return opp_table;
 
+       if (ret == -ENOENT) {
                dev_dbg(dev, "%s: Couldn't find clock: %d\n", __func__, ret);
+               return opp_table;
        }
 
-       return opp_table;
+       dev_pm_opp_put_opp_table(opp_table);
+
+       return ERR_PTR(dev_err_probe(dev, ret, "Couldn't find clock\n"));
 }
 
 /*
-- 
2.25.0.rc1.19.g042ed3e048af