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From: William Breathitt Gray <vilhelm.gray@gmail.com>
To: David Lechner <david@lechnology.com>
Cc: jic23@kernel.org, kamel.bouhara@bootlin.com,
	gwendal@chromium.org, alexandre.belloni@bootlin.com,
	linux-iio@vger.kernel.org, linux-kernel@vger.kernel.org,
	linux-stm32@st-md-mailman.stormreply.com,
	linux-arm-kernel@lists.infradead.org, syednwaris@gmail.com,
	patrick.havelange@essensium.com, fabrice.gasnier@st.com,
	mcoquelin.stm32@gmail.com, alexandre.torgue@st.com
Subject: Re: [PATCH v5 1/5] counter: Internalize sysfs interface code
Date: Sun, 18 Oct 2020 13:00:48 -0400
Message-ID: <20201018170048.GF231549@shinobu> (raw)
In-Reply-To: <17c22445-d523-07f8-d1ff-59e8dbc73cc8@lechnology.com>


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On Wed, Oct 14, 2020 at 08:38:40PM -0500, David Lechner wrote:
> On 9/26/20 9:18 PM, William Breathitt Gray wrote:
> > +static ssize_t counter_comp_u8_store(struct device *dev,
> > +				     struct device_attribute *attr,
> > +				     const char *buf, size_t len)
> > +{
> > +	const struct counter_attribute *const a = to_counter_attribute(attr);
> > +	struct counter_device *const counter = dev_get_drvdata(dev);
> > +	struct counter_count *const count = a->parent;
> > +	struct counter_synapse *const synapse = a->comp.priv;
> > +	const struct counter_available *const avail = a->comp.priv;
> > +	int err;
> > +	bool bool_data;
> > +	u8 data;
> > +
> > +	switch (a->comp.type) {
> > +	case COUNTER_COMP_BOOL:
> > +		err = kstrtobool(buf, &bool_data);
> > +		data = bool_data;
> > +		break;
> > +	case COUNTER_COMP_FUNCTION:
> > +		err = find_in_string_array(&data, count->functions_list,
> > +					   count->num_functions, buf,
> > +					   counter_function_str);
> > +		break;
> > +	case COUNTER_COMP_SYNAPSE_ACTION:
> > +		err = find_in_string_array(&data, synapse->actions_list,
> > +					   synapse->num_actions, buf,
> > +					   counter_synapse_action_str);
> > +		break;
> > +	case COUNTER_COMP_ENUM:
> > +		err = __sysfs_match_string(avail->strs, avail->num_items, buf);
> > +		data = err;
> > +		break;
> > +	case COUNTER_COMP_COUNT_MODE:
> > +		err = find_in_string_array(&data, avail->enums,
> > +					   avail->num_items, buf,
> > +					   counter_count_mode_str);
> > +		break;
> > +	default:
> > +		err = kstrtou8(buf, 0, &data);
> > +		break;
> > +	}
> 
> In this function, return values are not always errors. So it would make
> sense to call the err variable ret instead and check for ret < 0 below.
> 
> Setting enums to a value with index > 0 fails currently because of this.

Thank you for pointing this out, I'll fix this.

William Breathitt Gray

> > +	if (err)
> > +		return err;
> > +
> > +	switch (a->scope) {
> > +	case COUNTER_SCOPE_DEVICE:
> > +		err = a->comp.device_u8_write(counter, data);
> > +		break;
> > +	case COUNTER_SCOPE_SIGNAL:
> > +		err = a->comp.signal_u8_write(counter, a->parent, data);
> > +		break;
> > +	case COUNTER_SCOPE_COUNT:
> > +		if (a->comp.type == COUNTER_COMP_SYNAPSE_ACTION)
> > +			err = a->comp.action_write(counter, count, synapse,
> > +						   data);
> > +		else
> > +			err = a->comp.count_u8_write(counter, count, data);
> > +		break;
> > +	}
> > +	if (err)
> > +		return err;
> > +
> > +	return len;
> > +}
> 

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      reply index

Thread overview: 35+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-09-27  2:18 [PATCH v5 0/5] Introduce the Counter character device interface William Breathitt Gray
2020-09-27  2:18 ` [PATCH v5 2/5] docs: counter: Update to reflect sysfs internalization William Breathitt Gray
2020-09-27  2:18 ` [PATCH v5 3/5] counter: Add character device interface William Breathitt Gray
2020-10-14  1:40   ` David Lechner
2020-10-18 16:49     ` William Breathitt Gray
2020-10-20 15:53       ` David Lechner
2020-10-25 12:55         ` William Breathitt Gray
2020-10-25 16:36           ` David Lechner
2020-10-14 17:43   ` David Lechner
2020-10-14 19:05     ` William Breathitt Gray
2020-10-14 22:32       ` David Lechner
2020-10-14 22:40   ` David Lechner
2020-10-18 16:58     ` William Breathitt Gray
2020-10-20 16:06       ` David Lechner
2020-10-25 13:18         ` William Breathitt Gray
2020-10-25 16:34           ` David Lechner
2020-10-25 17:53             ` William Breathitt Gray
2020-09-27  2:18 ` [PATCH v5 4/5] docs: counter: Document " William Breathitt Gray
2020-10-08  8:09   ` Pavel Machek
2020-10-08 12:28     ` William Breathitt Gray
2020-10-12 17:04       ` David Lechner
2020-10-13 18:58         ` William Breathitt Gray
2020-10-13 19:08           ` David Lechner
2020-10-13 19:27             ` William Breathitt Gray
2020-09-27  2:18 ` [PATCH v5 5/5] counter: 104-quad-8: Add IRQ support for the ACCES 104-QUAD-8 William Breathitt Gray
2020-10-14  0:13   ` David Lechner
2020-10-18 14:50     ` William Breathitt Gray
2020-10-13  0:35 ` [PATCH v5 0/5] Introduce the Counter character device interface David Lechner
2020-10-18 14:14   ` William Breathitt Gray
     [not found] ` <e38f6dc3a08bf2510034334262776a6ed1df8b89.1601170670.git.vilhelm.gray@gmail.com>
2020-10-13  2:15   ` [PATCH v5 1/5] counter: Internalize sysfs interface code David Lechner
2020-10-18 14:49     ` William Breathitt Gray
2020-10-20 15:38       ` David Lechner
2020-10-23 13:12         ` William Breathitt Gray
2020-10-15  1:38   ` David Lechner
2020-10-18 17:00     ` William Breathitt Gray [this message]

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