From: Hartmut Knaack <knaack.h@gmx.de>
To: Dan Carpenter <dan.carpenter@oracle.com>,
Jonathan Cameron <jic23@kernel.org>
Cc: Lars-Peter Clausen <lars@metafoo.de>,
Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
Randy Dunlap <rdunlap@infradead.org>,
Aida Mynzhasova <ai.c.c0der@gmail.com>,
Masanari Iida <standby24x7@gmail.com>,
linux-iio@vger.kernel.org, linux-kernel@vger.kernel.org,
kernel-janitors@vger.kernel.org
Subject: Re: [patch v2] [patch] staging: iio: ad799x: remove some unneeded IS_ERR() checks
Date: Wed, 30 Apr 2014 23:52:57 +0200 [thread overview]
Message-ID: <536170B9.8030708@gmx.de> (raw)
In-Reply-To: <20140430210529.GA6008@mwanda>
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 <dan.carpenter@oracle.com>
Acked-by: Hartmut Knaack <knaack.h@gmx.de>
> ---
> 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;
> --
> To unsubscribe from this list: send the line "unsubscribe linux-iio" in
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> More majordomo info at http://vger.kernel.org/majordomo-info.html
>
next prev parent reply other threads:[~2014-04-30 21:52 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-04-30 10:08 [patch] staging: iio: ad799x: cleanup probe error handling Dan Carpenter
2014-04-30 12:00 ` Lars-Peter Clausen
2014-04-30 20:37 ` Hartmut Knaack
2014-04-30 21:05 ` [patch v2] [patch] staging: iio: ad799x: remove some unneeded IS_ERR() checks Dan Carpenter
2014-04-30 21:52 ` Hartmut Knaack [this message]
2014-05-03 10:17 ` Jonathan Cameron
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