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trimming task_work: kill ->data

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get rid of the only user of ->data; this is _not_ the final variant - in the
end we'll have task_work and rcu_head identical and just use cred->rcu,
at which point the separate allocation will be gone completely.

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
This commit is contained in:
Al Viro
2012-06-26 22:10:04 +04:00
parent 7266702805
commit 41f9d29f09
5 changed files with 17 additions and 12 deletions
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14
security/keys/keyctl.c
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@@ -1456,7 +1456,8 @@ long keyctl_session_to_parent(void)
{
struct task_struct *me, *parent;
const struct cred *mycred, *pcred;
struct task_work *newwork, *oldwork;
struct kludge *newwork;
struct task_work *oldwork;
key_ref_t keyring_r;
struct cred *cred;
int ret;
@@ -1466,7 +1467,7 @@ long keyctl_session_to_parent(void)
return PTR_ERR(keyring_r);
ret = -ENOMEM;
newwork = kmalloc(sizeof(struct task_work), GFP_KERNEL);
newwork = kmalloc(sizeof(struct kludge), GFP_KERNEL);
if (!newwork)
goto error_keyring;
@@ -1478,7 +1479,8 @@ long keyctl_session_to_parent(void)
goto error_newwork;
cred->tgcred->session_keyring = key_ref_to_ptr(keyring_r);
init_task_work(newwork, key_change_session_keyring, cred);
init_task_work(&newwork->twork, key_change_session_keyring);
newwork->cred = cred;
me = current;
rcu_read_lock();
@@ -1527,18 +1529,18 @@ long keyctl_session_to_parent(void)
/* the replacement session keyring is applied just prior to userspace
* restarting */
ret = task_work_add(parent, newwork, true);
ret = task_work_add(parent, &newwork->twork, true);
if (!ret)
newwork = NULL;
unlock:
write_unlock_irq(&tasklist_lock);
rcu_read_unlock();
if (oldwork) {
put_cred(oldwork->data);
put_cred(container_of(oldwork, struct kludge, twork)->cred);
kfree(oldwork);
}
if (newwork) {
put_cred(newwork->data);
put_cred(newwork->cred);
kfree(newwork);
}
return ret;