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Commit bc575064 authored by Rob Herring's avatar Rob Herring
Browse files

of/device: use of_property_for_each_string to parse compatible strings 



Instead of directly parsing the compatible property, use the
of_property_for_each_string() helper to iterate over each compatible
string. This reduces the LoC and makes the functions easier to
understand.

Signed-off-by: default avatarRob Herring <robh@kernel.org>
parent 7c6ffa0b

drivers/of/device.c

+23 −43
Original line number Diff line number Diff line
@@ -195,9 +195,10 @@ EXPORT_SYMBOL(of_device_get_match_data); 


static ssize_t of_device_get_modalias(struct device *dev, char *str, ssize_t len)

{

	const char *compat;

	int cplen, i;

	ssize_t tsize, csize, repend;

	const char *compat, *start = str;

	char *c;

	struct property *p;

	ssize_t csize;



	if ((!dev) || (!dev->of_node))

		return -ENODEV;
@@ -205,42 +206,24 @@ static ssize_t of_device_get_modalias(struct device *dev, char *str, ssize_t len 
	/* Name & Type */

	csize = snprintf(str, len, "of:N%sT%s", dev->of_node->name,

			 dev->of_node->type);



	/* Get compatible property if any */

	compat = of_get_property(dev->of_node, "compatible", &cplen);

	if (!compat)

		return csize;



	/* Find true end (we tolerate multiple \0 at the end */

	for (i = (cplen - 1); i >= 0 && !compat[i]; i--)

		cplen--;

	if (!cplen)

		return csize;

	cplen++;



	/* Check space (need cplen+1 chars including final \0) */

	tsize = csize + cplen;

	repend = tsize;



	if (csize >= len)		/* @ the limit, all is already filled */

		return tsize;



	if (tsize >= len) {		/* limit compat list */

		cplen = len - csize - 1;

		repend = len;

	len -= csize;

	str += csize;



	of_property_for_each_string(dev->of_node, "compatible", p, compat) {

		if (strlen(compat) + 2 > len)

			break;



		csize = snprintf(str, len, "C%s", compat);

		for (c = str; c; ) {

			c = strchr(c, ' ');

			if (c)

				*c++ = '_';

		}



	/* Copy and do char replacement */

	memcpy(&str[csize + 1], compat, cplen);

	for (i = csize; i < repend; i++) {

		char c = str[i];

		if (c == '\0')

			str[i] = 'C';

		else if (c == ' ')

			str[i] = '_';

		len -= csize;

		str += csize;

	}



	return repend;

	return str - start;

}



int of_device_request_module(struct device *dev)
@@ -288,7 +271,8 @@ void of_device_uevent(struct device *dev, struct kobj_uevent_env *env) 
{

	const char *compat;

	struct alias_prop *app;

	int seen = 0, cplen, sl;

	struct property *p;

	int seen = 0;



	if ((!dev) || (!dev->of_node))

		return;
@@ -301,12 +285,8 @@ void of_device_uevent(struct device *dev, struct kobj_uevent_env *env) 
	/* Since the compatible field can contain pretty much anything

	 * it's not really legal to split it out with commas. We split it

	 * up using a number of environment variables instead. */

	compat = of_get_property(dev->of_node, "compatible", &cplen);

	while (compat && *compat && cplen > 0) {

	of_property_for_each_string(dev->of_node, "compatible", p, compat) {

		add_uevent_var(env, "OF_COMPATIBLE_%d=%s", seen, compat);

		sl = strlen(compat) + 1;

		compat += sl;

		cplen -= sl;

		seen++;

	}

	add_uevent_var(env, "OF_COMPATIBLE_N=%d", seen);