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Date: Mon, 24 Jul 2017 10:14:37 -0500
From: Rob Herring <robh@...nel.org>
To: Frank Rowand <frowand.list@...il.com>,
Sergei Shtylyov <sergei.shtylyov@...entembedded.com>
Cc: devicetree@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH] 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: Rob Herring <robh@...nel.org>
---
drivers/of/device.c | 66 +++++++++++++++++++----------------------------------
1 file changed, 23 insertions(+), 43 deletions(-)
diff --git a/drivers/of/device.c b/drivers/of/device.c
index f9f31d66f64d..9d0895fb53b5 100644
--- a/drivers/of/device.c
+++ b/drivers/of/device.c
@@ -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;
- }
-
- /* 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;
+
+ 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++ = '_';
+ }
+ 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);
--
2.11.0
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