mfd: Constify WM8994 write path

[pandora-kernel.git] / kernel / cgroup.c

diff --git a/kernel/cgroup.c b/kernel/cgroup.c
index b24d702..e31b220 100644 (file)
--- a/kernel/cgroup.c
+++ b/kernel/cgroup.c
@@ -1813,10 +1813,8 @@ int cgroup_attach_task(struct cgroup *cgrp, struct task_struct *tsk)
 
        /* Update the css_set linked lists if we're using them */
        write_lock(&css_set_lock);
-       if (!list_empty(&tsk->cg_list)) {
-               list_del(&tsk->cg_list);
-               list_add(&tsk->cg_list, &newcg->tasks);
-       }
+       if (!list_empty(&tsk->cg_list))
+               list_move(&tsk->cg_list, &newcg->tasks);
        write_unlock(&css_set_lock);
 
        for_each_subsys(root, ss) {
@@ -3655,12 +3653,12 @@ again:
        spin_lock(&release_list_lock);
        set_bit(CGRP_REMOVED, &cgrp->flags);
        if (!list_empty(&cgrp->release_list))
-               list_del(&cgrp->release_list);
+               list_del_init(&cgrp->release_list);
        spin_unlock(&release_list_lock);
 
        cgroup_lock_hierarchy(cgrp->root);
        /* delete this cgroup from parent->children */
-       list_del(&cgrp->sibling);
+       list_del_init(&cgrp->sibling);
        cgroup_unlock_hierarchy(cgrp->root);
 
        d = dget(cgrp->dentry);
@@ -3879,7 +3877,7 @@ void cgroup_unload_subsys(struct cgroup_subsys *ss)
        subsys[ss->subsys_id] = NULL;
 
        /* remove subsystem from rootnode's list of subsystems */
-       list_del(&ss->sibling);
+       list_del_init(&ss->sibling);
 
        /*
         * disentangle the css from all css_sets attached to the dummytop. as
@@ -4230,20 +4228,8 @@ void cgroup_post_fork(struct task_struct *child)
  */
 void cgroup_exit(struct task_struct *tsk, int run_callbacks)
 {
-       int i;
        struct css_set *cg;
-
-       if (run_callbacks && need_forkexit_callback) {
-               /*
-                * modular subsystems can't use callbacks, so no need to lock
-                * the subsys array
-                */
-               for (i = 0; i < CGROUP_BUILTIN_SUBSYS_COUNT; i++) {
-                       struct cgroup_subsys *ss = subsys[i];
-                       if (ss->exit)
-                               ss->exit(ss, tsk);
-               }
-       }
+       int i;
 
        /*
         * Unlink from the css_set task list if necessary.
@@ -4253,7 +4239,7 @@ void cgroup_exit(struct task_struct *tsk, int run_callbacks)
        if (!list_empty(&tsk->cg_list)) {
                write_lock(&css_set_lock);
                if (!list_empty(&tsk->cg_list))
-                       list_del(&tsk->cg_list);
+                       list_del_init(&tsk->cg_list);
                write_unlock(&css_set_lock);
        }
 
@@ -4261,7 +4247,24 @@ void cgroup_exit(struct task_struct *tsk, int run_callbacks)
        task_lock(tsk);
        cg = tsk->cgroups;
        tsk->cgroups = &init_css_set;
+
+       if (run_callbacks && need_forkexit_callback) {
+               /*
+                * modular subsystems can't use callbacks, so no need to lock
+                * the subsys array
+                */
+               for (i = 0; i < CGROUP_BUILTIN_SUBSYS_COUNT; i++) {
+                       struct cgroup_subsys *ss = subsys[i];
+                       if (ss->exit) {
+                               struct cgroup *old_cgrp =
+                                       rcu_dereference_raw(cg->subsys[i])->cgroup;
+                               struct cgroup *cgrp = task_cgroup(tsk, i);
+                               ss->exit(ss, cgrp, old_cgrp, tsk);
+                       }
+               }
+       }
        task_unlock(tsk);
+
        if (cg)
                put_css_set_taskexit(cg);
 }
@@ -4813,6 +4816,29 @@ css_get_next(struct cgroup_subsys *ss, int id,
        return ret;
 }
 
+/*
+ * get corresponding css from file open on cgroupfs directory
+ */
+struct cgroup_subsys_state *cgroup_css_from_dir(struct file *f, int id)
+{
+       struct cgroup *cgrp;
+       struct inode *inode;
+       struct cgroup_subsys_state *css;
+
+       inode = f->f_dentry->d_inode;
+       /* check in cgroup filesystem dir */
+       if (inode->i_op != &cgroup_dir_inode_operations)
+               return ERR_PTR(-EBADF);
+
+       if (id < 0 || id >= CGROUP_SUBSYS_COUNT)
+               return ERR_PTR(-EINVAL);
+
+       /* get cgroup */
+       cgrp = __d_cgrp(f->f_dentry);
+       css = cgrp->subsys[id];
+       return css ? css : ERR_PTR(-ENOENT);
+}
+
 #ifdef CONFIG_CGROUP_DEBUG
 static struct cgroup_subsys_state *debug_create(struct cgroup_subsys *ss,
                                                   struct cgroup *cont)