My static checker is upset that we check IS_ERR(t->reg) when we know it
is not an ERR_PTR.
Checking for IS_ERR() twice is often a sign of confusion and buggy code.
In this case, if the call to "ret = regulator_enable(st->vref);" fails,
then we call "regulator_disable(st->vref);" and that's a mistake because
"st->vref" is not enabled.
I fixed these problems and Hartmut Knaack pointed out a couple unneeded
IS_ERR() checks in ad799x_remove() so I have removed those as well.
Signed-off-by: Dan Carpenter <[email protected]>
---
v2: remove the unneeded checks in ad799x_remove() as well. Updated the
commit message to say that it's actually a small bug fix.
diff --git a/drivers/iio/adc/ad799x.c b/drivers/iio/adc/ad799x.c
index 16a8b14..39b4cb4 100644
--- a/drivers/iio/adc/ad799x.c
+++ b/drivers/iio/adc/ad799x.c
@@ -717,7 +717,7 @@ static int ad799x_probe(struct i2c_client *client,
ret = iio_triggered_buffer_setup(indio_dev, NULL,
&ad799x_trigger_handler, NULL);
if (ret)
- goto error_disable_reg;
+ goto error_disable_vref;
if (client->irq > 0) {
ret = devm_request_threaded_irq(&client->dev,
@@ -739,11 +739,10 @@ static int ad799x_probe(struct i2c_client *client,
error_cleanup_ring:
iio_triggered_buffer_cleanup(indio_dev);
+error_disable_vref:
+ regulator_disable(st->vref);
error_disable_reg:
- if (!IS_ERR(st->vref))
- regulator_disable(st->vref);
- if (!IS_ERR(st->reg))
- regulator_disable(st->reg);
+ regulator_disable(st->reg);
return ret;
}
@@ -756,10 +755,8 @@ static int ad799x_remove(struct i2c_client *client)
iio_device_unregister(indio_dev);
iio_triggered_buffer_cleanup(indio_dev);
- if (!IS_ERR(st->vref))
- regulator_disable(st->vref);
- if (!IS_ERR(st->reg))
- regulator_disable(st->reg);
+ regulator_disable(st->vref);
+ regulator_disable(st->reg);
kfree(st->rx_buf);
return 0;
Dan Carpenter schrieb:
> My static checker is upset that we check IS_ERR(t->reg) when we know it
> is not an ERR_PTR.
>
> Checking for IS_ERR() twice is often a sign of confusion and buggy code.
> In this case, if the call to "ret = regulator_enable(st->vref);" fails,
> then we call "regulator_disable(st->vref);" and that's a mistake because
> "st->vref" is not enabled.
>
> I fixed these problems and Hartmut Knaack pointed out a couple unneeded
> IS_ERR() checks in ad799x_remove() so I have removed those as well.
>
> Signed-off-by: Dan Carpenter <[email protected]>
Acked-by: Hartmut Knaack <[email protected]>
> ---
> v2: remove the unneeded checks in ad799x_remove() as well. Updated the
> commit message to say that it's actually a small bug fix.
>
> diff --git a/drivers/iio/adc/ad799x.c b/drivers/iio/adc/ad799x.c
> index 16a8b14..39b4cb4 100644
> --- a/drivers/iio/adc/ad799x.c
> +++ b/drivers/iio/adc/ad799x.c
> @@ -717,7 +717,7 @@ static int ad799x_probe(struct i2c_client *client,
> ret = iio_triggered_buffer_setup(indio_dev, NULL,
> &ad799x_trigger_handler, NULL);
> if (ret)
> - goto error_disable_reg;
> + goto error_disable_vref;
>
> if (client->irq > 0) {
> ret = devm_request_threaded_irq(&client->dev,
> @@ -739,11 +739,10 @@ static int ad799x_probe(struct i2c_client *client,
>
> error_cleanup_ring:
> iio_triggered_buffer_cleanup(indio_dev);
> +error_disable_vref:
> + regulator_disable(st->vref);
> error_disable_reg:
> - if (!IS_ERR(st->vref))
> - regulator_disable(st->vref);
> - if (!IS_ERR(st->reg))
> - regulator_disable(st->reg);
> + regulator_disable(st->reg);
>
> return ret;
> }
> @@ -756,10 +755,8 @@ static int ad799x_remove(struct i2c_client *client)
> iio_device_unregister(indio_dev);
>
> iio_triggered_buffer_cleanup(indio_dev);
> - if (!IS_ERR(st->vref))
> - regulator_disable(st->vref);
> - if (!IS_ERR(st->reg))
> - regulator_disable(st->reg);
> + regulator_disable(st->vref);
> + regulator_disable(st->reg);
> kfree(st->rx_buf);
>
> return 0;
> --
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