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-rw-r--r--lib/kobject_uevent.c44
1 files changed, 30 insertions, 14 deletions
diff --git a/lib/kobject_uevent.c b/lib/kobject_uevent.c
index a1922765ff31..84272ed77f03 100644
--- a/lib/kobject_uevent.c
+++ b/lib/kobject_uevent.c
@@ -63,8 +63,11 @@ static char *action_to_string(enum kobject_action action)
63 * @action: action that is happening (usually KOBJ_MOVE) 63 * @action: action that is happening (usually KOBJ_MOVE)
64 * @kobj: struct kobject that the action is happening to 64 * @kobj: struct kobject that the action is happening to
65 * @envp_ext: pointer to environmental data 65 * @envp_ext: pointer to environmental data
66 *
67 * Returns 0 if kobject_uevent() is completed with success or the
68 * corresponding error when it fails.
66 */ 69 */
67void kobject_uevent_env(struct kobject *kobj, enum kobject_action action, 70int kobject_uevent_env(struct kobject *kobj, enum kobject_action action,
68 char *envp_ext[]) 71 char *envp_ext[])
69{ 72{
70 char **envp; 73 char **envp;
@@ -79,14 +82,16 @@ void kobject_uevent_env(struct kobject *kobj, enum kobject_action action,
79 u64 seq; 82 u64 seq;
80 char *seq_buff; 83 char *seq_buff;
81 int i = 0; 84 int i = 0;
82 int retval; 85 int retval = 0;
83 int j; 86 int j;
84 87
85 pr_debug("%s\n", __FUNCTION__); 88 pr_debug("%s\n", __FUNCTION__);
86 89
87 action_string = action_to_string(action); 90 action_string = action_to_string(action);
88 if (!action_string) 91 if (!action_string) {
89 return; 92 pr_debug("kobject attempted to send uevent without action_string!\n");
93 return -EINVAL;
94 }
90 95
91 /* search the kset we belong to */ 96 /* search the kset we belong to */
92 top_kobj = kobj; 97 top_kobj = kobj;
@@ -95,31 +100,39 @@ void kobject_uevent_env(struct kobject *kobj, enum kobject_action action,
95 top_kobj = top_kobj->parent; 100 top_kobj = top_kobj->parent;
96 } while (!top_kobj->kset && top_kobj->parent); 101 } while (!top_kobj->kset && top_kobj->parent);
97 } 102 }
98 if (!top_kobj->kset) 103 if (!top_kobj->kset) {
99 return; 104 pr_debug("kobject attempted to send uevent without kset!\n");
105 return -EINVAL;
106 }
100 107
101 kset = top_kobj->kset; 108 kset = top_kobj->kset;
102 uevent_ops = kset->uevent_ops; 109 uevent_ops = kset->uevent_ops;
103 110
104 /* skip the event, if the filter returns zero. */ 111 /* skip the event, if the filter returns zero. */
105 if (uevent_ops && uevent_ops->filter) 112 if (uevent_ops && uevent_ops->filter)
106 if (!uevent_ops->filter(kset, kobj)) 113 if (!uevent_ops->filter(kset, kobj)) {
107 return; 114 pr_debug("kobject filter function caused the event to drop!\n");
115 return 0;
116 }
108 117
109 /* environment index */ 118 /* environment index */
110 envp = kzalloc(NUM_ENVP * sizeof (char *), GFP_KERNEL); 119 envp = kzalloc(NUM_ENVP * sizeof (char *), GFP_KERNEL);
111 if (!envp) 120 if (!envp)
112 return; 121 return -ENOMEM;
113 122
114 /* environment values */ 123 /* environment values */
115 buffer = kmalloc(BUFFER_SIZE, GFP_KERNEL); 124 buffer = kmalloc(BUFFER_SIZE, GFP_KERNEL);
116 if (!buffer) 125 if (!buffer) {
126 retval = -ENOMEM;
117 goto exit; 127 goto exit;
128 }
118 129
119 /* complete object path */ 130 /* complete object path */
120 devpath = kobject_get_path(kobj, GFP_KERNEL); 131 devpath = kobject_get_path(kobj, GFP_KERNEL);
121 if (!devpath) 132 if (!devpath) {
133 retval = -ENOENT;
122 goto exit; 134 goto exit;
135 }
123 136
124 /* originating subsystem */ 137 /* originating subsystem */
125 if (uevent_ops && uevent_ops->name) 138 if (uevent_ops && uevent_ops->name)
@@ -204,7 +217,7 @@ exit:
204 kfree(devpath); 217 kfree(devpath);
205 kfree(buffer); 218 kfree(buffer);
206 kfree(envp); 219 kfree(envp);
207 return; 220 return retval;
208} 221}
209 222
210EXPORT_SYMBOL_GPL(kobject_uevent_env); 223EXPORT_SYMBOL_GPL(kobject_uevent_env);
@@ -214,10 +227,13 @@ EXPORT_SYMBOL_GPL(kobject_uevent_env);
214 * 227 *
215 * @action: action that is happening (usually KOBJ_ADD and KOBJ_REMOVE) 228 * @action: action that is happening (usually KOBJ_ADD and KOBJ_REMOVE)
216 * @kobj: struct kobject that the action is happening to 229 * @kobj: struct kobject that the action is happening to
230 *
231 * Returns 0 if kobject_uevent() is completed with success or the
232 * corresponding error when it fails.
217 */ 233 */
218void kobject_uevent(struct kobject *kobj, enum kobject_action action) 234int kobject_uevent(struct kobject *kobj, enum kobject_action action)
219{ 235{
220 kobject_uevent_env(kobj, action, NULL); 236 return kobject_uevent_env(kobj, action, NULL);
221} 237}
222 238
223EXPORT_SYMBOL_GPL(kobject_uevent); 239EXPORT_SYMBOL_GPL(kobject_uevent);