Techwizz/kernel-fxtec-pro1x
1
0
Fork 0
Code Issues Pull requests Projects Releases Packages Wiki Activity

of: Disabling OF functions that use sysfs if CONFIG_SYSFS disabled

Browse source 
This patch is to the fix the recent runtime bug in kernel reported by
<fengguang.wu@intel.com>. The bug was exposed by commit b951f9dc,
"Enabling OF selftest to run without machine's devicetree" and is
exposed when CONFIG_OF_SELFTEST is enabled and CONFIG_SYSFS is
disabled.

Mail Subject: [OF test] BUG: unable to handle kernel NULL pointer
dereference at 00000038

Tested on x86 and arm architecture

Signed-off-by: Gaurav Minocha <gaurav.minocha.os@gmail.com>
Signed-off-by: Grant Likely <grant.likely@linaro.org>
This commit is contained in:
Gaurav Minocha 2014-09-05 09:56:13 -07:00 committed by Grant Likely
parent 5f74d8b7b8
commit ef69d74035
2 changed files with 15 additions and 0 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

12
drivers/of/base.c
View file

@ -138,6 +138,9 @@ int __of_add_property_sysfs(struct device_node *np, struct property *pp)
/* Important: Don't leak passwords */
bool secure = strncmp(pp->name, "security-", 9) == 0;
if (!IS_ENABLED(CONFIG_SYSFS))
return 0;
if (!of_kset || !of_node_is_attached(np))
return 0;
@ -158,6 +161,9 @@ int __of_attach_node_sysfs(struct device_node *np)
struct property *pp;
int rc;
if (!IS_ENABLED(CONFIG_SYSFS))
return 0;
if (!of_kset)
return 0;
@ -1713,6 +1719,9 @@ int __of_remove_property(struct device_node *np, struct property *prop)
void __of_remove_property_sysfs(struct device_node *np, struct property *prop)
{
if (!IS_ENABLED(CONFIG_SYSFS))
return;
/* at early boot, bail here and defer setup to of_init() */
if (of_kset && of_node_is_attached(np))
sysfs_remove_bin_file(&np->kobj, &prop->attr);
@ -1777,6 +1786,9 @@ int __of_update_property(struct device_node *np, struct property *newprop,
void __of_update_property_sysfs(struct device_node *np, struct property *newprop,
struct property *oldprop)
{
if (!IS_ENABLED(CONFIG_SYSFS))
return;
/* At early boot, bail out and defer setup to of_init() */
if (!of_kset)
return;

3
drivers/of/dynamic.c
View file

@ -45,6 +45,9 @@ void __of_detach_node_sysfs(struct device_node *np)
{
struct property *pp;
if (!IS_ENABLED(CONFIG_SYSFS))
return;
BUG_ON(!of_node_is_initialized(np));
if (!of_kset)
return;