From: Jonathan Cameron <jic23@kernel.org>
To: Peter Rosin <peda@axentia.se>,
Lars-Peter Clausen <lars@metafoo.de>,
linux-kernel@vger.kernel.org
Cc: Hartmut Knaack <knaack.h@gmx.de>,
Peter Meerwald-Stadler <pmeerw@pmeerw.net>,
linux-iio@vger.kernel.org
Subject: Re: [PATCH] iio: inkern: fix a static checker error
Date: Wed, 26 Apr 2017 06:04:00 +0100 [thread overview]
Message-ID: <809cc676-36fe-0c54-466d-541979af2d08@kernel.org> (raw)
In-Reply-To: <60934fcd-214e-3618-84ff-46484197e737@axentia.se>
On 24/04/17 10:32, Peter Rosin wrote:
> On 2017-04-20 23:13, Peter Rosin wrote:
>> On 2017-04-20 23:12, Lars-Peter Clausen wrote:
>>> On 04/20/2017 11:01 PM, Peter Rosin wrote:
>>>> Avoid this smatch error:
>>>> drivers/iio/inkern.c:751 iio_read_avail_channel_raw() error: double unlock 'mutex:&chan->indio_dev->info_exist_lock'
>>>
>>> Looks good, but it's not just the smatch error, this is a real issue. This
>>> even seems to be a endless loop, always jumping back to err_unlock.
>>
>> Yes, it should probably go to stable too...
>
> Nope, not an endless loop, but I of course only noticed after sending
> a v2 [1] which falsely stated just that. Ignore that v2 patch and take
> this one instead, for the reasons stated in my followup [2] to that
> message.
>
> Involving stable is probably not needed either...
Applied to the togreg branch of iio.git. Thanks,
Jonathan
>
> Cheers,
> peda
>
> [1] https://lkml.org/lkml/2017/4/24/179
> [2] https://lkml.org/lkml/2017/4/24/221
>
>>>>
>>>> Fixes: 00c5f80c2fad ("iio: inkern: add helpers to query available values from channels")
>>>> Signed-off-by: Peter Rosin <peda@axentia.se>
>>>
>>>> ---
>>>> drivers/iio/inkern.c | 4 +---
>>>> 1 file changed, 1 insertion(+), 3 deletions(-)
>>>>
>>>> diff --git a/drivers/iio/inkern.c b/drivers/iio/inkern.c
>>>> index 7a13535dc3e9..a3941bade6a7 100644
>>>> --- a/drivers/iio/inkern.c
>>>> +++ b/drivers/iio/inkern.c
>>>> @@ -750,11 +750,9 @@ int iio_read_avail_channel_raw(struct iio_channel *chan,
>>>> err_unlock:
>>>> mutex_unlock(&chan->indio_dev->info_exist_lock);
>>>>
>>>> - if (ret >= 0 && type != IIO_VAL_INT) {
>>>> + if (ret >= 0 && type != IIO_VAL_INT)
>>>> /* raw values are assumed to be IIO_VAL_INT */
>>>> ret = -EINVAL;
>>>> - goto err_unlock;
>>>> - }
>>>>
>>>> return ret;
>>>> }
>>>>
>>>
>>
>
> --
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>
prev parent reply other threads:[~2017-04-26 5:04 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-04-20 21:01 [PATCH] iio: inkern: fix a static checker error Peter Rosin
2017-04-20 21:12 ` Lars-Peter Clausen
2017-04-20 21:13 ` Peter Rosin
2017-04-24 9:32 ` Peter Rosin
2017-04-25 16:01 ` Lars-Peter Clausen
2017-04-25 17:11 ` Peter Rosin
2017-04-26 5:04 ` Jonathan Cameron [this message]
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