On Tue, 20 May 2014 19:46:19 -0700, Frank Rowand <frowand.list@xxxxxxxxx> wrote:
> On 5/20/2014 7:41 PM, Frank Rowand wrote:
> < snip >
> > I will reply to this email with an additional patch that restores the
> > original behavior.
> < snip >
> From: Frank Rowand <frank.rowand@xxxxxxxxxxxxxx>
>
> If __of_find_node_by_path() returns parent when the remaining portion of the
> path is "/" then the behavior of of_find_node_by_path() has changed.
>
> Previously, adding an extraneous "/" on the end of a path would result
> in of_find_node_by_path() not finding a match.
>
> Signed-off-by: Frank Rowand <frank.rowand@xxxxxxxxxxxxxx>
> ---
> drivers/of/base.c | 13 ++++++++++++-
> 1 file changed, 12 insertions(+), 1 deletion(-)
>
> Index: b/drivers/of/base.c
> ===================================================================
> --- a/drivers/of/base.c
> +++ b/drivers/of/base.c
> @@ -778,7 +778,7 @@ static struct device_node *__of_find_nod
> int len = strchrnul(path, '/') - path;
>
> if (!len)
> - return parent;
> + return NULL;
>
> for_each_child_of_node(parent, child) {
> const char *name = strrchr(child->full_name, '/');
> @@ -813,6 +813,17 @@ struct device_node *of_find_node_by_path
> struct property *pp;
> unsigned long flags;
>
> + if (strcmp(path, "/") == 0) {
> + raw_spin_lock_irqsave(&devtree_lock, flags);
> + for (; np; np = np->allnext) {
> + if (np->full_name && (of_node_cmp(np->full_name, path) == 0)
> + && of_node_get(np))
> + break;
> + }
> + raw_spin_unlock_irqrestore(&devtree_lock, flags);
> + return np;
> + }
> +
Special case for the root node? Could use a comment, and of_allnodes
will already point to the root node so this could simply be:
if (strcmp(path, "/") == 0)
return of_node_get(np);
Here's a complete patch:
commit adc96db6c39ef7b895e75d30dbc69781f6443f1d
Author: Grant Likely <grant.likely@xxxxxxxxxx>
Date: Thu May 22 11:55:31 2014 +0900
fix trailing '/' case
diff --git a/drivers/of/base.c b/drivers/of/base.c
index c05a143b6a70..45ac44c8dfea 100644
--- a/drivers/of/base.c
+++ b/drivers/of/base.c
@@ -790,7 +790,7 @@ static struct device_node *__of_find_node_by_path(struct device_node *parent,
int len = strchrnul(path, '/') - path;
if (!len)
- return parent;
+ return NULL;
__for_each_child_of_node(parent, child) {
const char *name = strrchr(child->full_name, '/');
@@ -820,10 +820,13 @@ static struct device_node *__of_find_node_by_path(struct device_node *parent,
*/
struct device_node *of_find_node_by_path(const char *path)
{
- struct device_node *np = of_allnodes;
+ struct device_node *np = NULL;
struct property *pp;
unsigned long flags;
+ if (strcmp(path, "/") == 0)
+ return of_node_get(of_allnodes);
+
/* The path could begin with an alias */
if (*path != '/') {
char *p = strchrnul(path, '/');
@@ -833,7 +836,6 @@ struct device_node *of_find_node_by_path(const char *path)
if (!of_aliases)
return NULL;
- np = NULL;
for_each_property_of_node(of_aliases, pp) {
if (strlen(pp->name) == len && !strncmp(pp->name, path, len)) {
np = of_find_node_by_path(pp->value);
@@ -847,6 +849,8 @@ struct device_node *of_find_node_by_path(const char *path)
/* Step down the tree matching path components */
raw_spin_lock_irqsave(&devtree_lock, flags);
+ if (!np)
+ np = of_node_get(of_allnodes);
while (np && *path == '/') {
path++; /* Increment past '/' delimiter */
np = __of_find_node_by_path(np, path);
diff --git a/drivers/of/selftest.c b/drivers/of/selftest.c
index 10900b18fc06..aeb0b5c8b21d 100644
--- a/drivers/of/selftest.c
+++ b/drivers/of/selftest.c
@@ -42,9 +42,7 @@ static void __init of_selftest_find_node_by_name(void)
/* Test if trailing '/' works */
np = of_find_node_by_path("/testcase-data/");
- selftest(np && !strcmp("/testcase-data", np->full_name),
- "find /testcase-data/ failed\n");
- of_node_put(np);
+ selftest(!np, "trailing '/' on /testcase-data/ should fail\n");
np = of_find_node_by_path("/testcase-data/phandle-tests/consumer-a");
selftest(np && !strcmp("/testcase-data/phandle-tests/consumer-a", np->full_name),
@@ -58,9 +56,7 @@ static void __init of_selftest_find_node_by_name(void)
/* Test if trailing '/' works on aliases */
np = of_find_node_by_path("testcase-alias/");
- selftest(np && !strcmp("/testcase-data", np->full_name),
- "find testcase-alias/ failed\n");
- of_node_put(np);
+ selftest(!np, "trailing '/' on testcase-alias/ should fail\n");
np = of_find_node_by_path("testcase-alias/phandle-tests/consumer-a");
selftest(np && !strcmp("/testcase-data/phandle-tests/consumer-a", np->full_name),
--
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