From: Lars-Peter Clausen <lars@metafoo.de>
To: Daniel Baluta <daniel.baluta@intel.com>, jic23@kernel.org
Cc: jlbec@evilplan.org, knaack.h@gmx.de,
linux-kernel@vger.kernel.org, linux-iio@vger.kernel.org,
octavian.purdila@intel.com, pebolle@tiscali.nl,
patrick.porlan@intel.com, adriana.reus@intel.com,
constantin.musca@intel.com, marten@intuitiveaerial.com
Subject: Re: [PATCH v5 3/4] iio: trigger: Introduce IIO hrtimer based trigger
Date: Mon, 04 May 2015 21:54:08 +0200 [thread overview]
Message-ID: <5547CE60.5000300@metafoo.de> (raw)
In-Reply-To: <1430736604-22119-4-git-send-email-daniel.baluta@intel.com>
On 05/04/2015 12:50 PM, Daniel Baluta wrote:
[...]
> +IIO_HRTIMER_INFO_ATTR(sampling_frequency, S_IRUGO | S_IWUSR,
> + iio_hrtimer_info_show_sampling_frequency,
> + iio_hrtimer_info_store_sampling_frequency);
I wonder if the sampling frequency should be configurable the regular IIO
API, just like any other IIO device. But things like min/max sampling
frequency should be configured in configfs.
[...]
> +#endif /* CONFIGFS_FS */
> +
[...]
> +static struct iio_sw_trigger *iio_trig_hrtimer_probe(const char *name)
> +{
[...]
> +#ifdef CONFIG_CONFIGFS_FS
> + config_group_init_type_name(&trig_info->swt.group, name,
> + &iio_hrtimer_type);
> +#endif
This should probably have a helper function in the sw trigger core, that
gets stubbed out when CONFIG_FS is disabled. Otherwise we'll see the same
#ifdef in every software trigger driver.
[...]
> +}
> +
> +static int iio_trig_hrtimer_remove(struct iio_sw_trigger *swt)
> +{
> + struct iio_hrtimer_info *trig_info;
> +
> + trig_info = iio_trigger_get_drvdata(swt->trigger);
> +
> + hrtimer_cancel(&trig_info->timer);
> +
> + iio_trigger_unregister(swt->trigger);
> + iio_trigger_free(swt->trigger);
There is a bit of a race condition here. hrtimer_cancel() should be called
between unregister and free, otherwise it might be re-armed before it is
unregistered.
> + kfree(trig_info);
> +
> + return 0;
> +}
> +
> +struct iio_sw_trigger_ops iio_trig_hrtimer_ops = {
const
> + .probe = iio_trig_hrtimer_probe,
> + .remove = iio_trig_hrtimer_remove,
> +};
[...]
next prev parent reply other threads:[~2015-05-04 19:54 UTC|newest]
Thread overview: 18+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-05-04 10:50 [PATCH v5 0/4] Add initial configfs support for IIO Daniel Baluta
2015-05-04 10:50 ` [PATCH v5 1/4] iio: core: Introduce IIO software triggers Daniel Baluta
2015-05-04 20:11 ` Lars-Peter Clausen
2015-05-06 9:24 ` Daniel Baluta
2015-05-04 10:50 ` [PATCH v5 2/4] iio: core: Introduce IIO configfs support Daniel Baluta
2015-05-04 19:59 ` Lars-Peter Clausen
2015-05-05 13:48 ` Jonathan Cameron
2015-05-06 16:15 ` Daniel Baluta
2015-05-04 10:50 ` [PATCH v5 3/4] iio: trigger: Introduce IIO hrtimer based trigger Daniel Baluta
2015-05-04 19:54 ` Lars-Peter Clausen [this message]
2015-05-05 13:51 ` Jonathan Cameron
2015-05-06 16:25 ` Daniel Baluta
2015-05-06 17:16 ` Jonathan Cameron
2015-05-06 17:37 ` Daniel Baluta
2015-05-07 9:19 ` Jonathan Cameron
2015-05-07 10:26 ` Daniel Baluta
2015-05-07 18:26 ` Lars-Peter Clausen
2015-05-04 10:50 ` [PATCH v5 4/4] iio: Documentation: Add IIO configfs documentation Daniel Baluta
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