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Diffstat (limited to 'ipc/util.c')
-rw-r--r--ipc/util.c28
1 files changed, 14 insertions, 14 deletions
diff --git a/ipc/util.c b/ipc/util.c
index ff3323ef8..be4230020 100644
--- a/ipc/util.c
+++ b/ipc/util.c
@@ -467,10 +467,7 @@ void ipc_rcu_free(struct rcu_head *head)
{
struct ipc_rcu *p = container_of(head, struct ipc_rcu, rcu);
- if (is_vmalloc_addr(p))
- vfree(p);
- else
- kfree(p);
+ kvfree(p);
}
/**
@@ -558,7 +555,7 @@ void ipc64_perm_to_ipc_perm(struct ipc64_perm *in, struct ipc_perm *out)
* Call inside the RCU critical section.
* The ipc object is *not* locked on exit.
*/
-struct kern_ipc_perm *ipc_obtain_object(struct ipc_ids *ids, int id)
+struct kern_ipc_perm *ipc_obtain_object_idr(struct ipc_ids *ids, int id)
{
struct kern_ipc_perm *out;
int lid = ipcid_to_idx(id);
@@ -584,21 +581,24 @@ struct kern_ipc_perm *ipc_lock(struct ipc_ids *ids, int id)
struct kern_ipc_perm *out;
rcu_read_lock();
- out = ipc_obtain_object(ids, id);
+ out = ipc_obtain_object_idr(ids, id);
if (IS_ERR(out))
- goto err1;
+ goto err;
spin_lock(&out->lock);
- /* ipc_rmid() may have already freed the ID while ipc_lock
- * was spinning: here verify that the structure is still valid
+ /*
+ * ipc_rmid() may have already freed the ID while ipc_lock()
+ * was spinning: here verify that the structure is still valid.
+ * Upon races with RMID, return -EIDRM, thus indicating that
+ * the ID points to a removed identifier.
*/
if (ipc_valid_object(out))
return out;
spin_unlock(&out->lock);
- out = ERR_PTR(-EINVAL);
-err1:
+ out = ERR_PTR(-EIDRM);
+err:
rcu_read_unlock();
return out;
}
@@ -608,7 +608,7 @@ err1:
* @ids: ipc identifier set
* @id: ipc id to look for
*
- * Similar to ipc_obtain_object() but also checks
+ * Similar to ipc_obtain_object_idr() but also checks
* the ipc object reference counter.
*
* Call inside the RCU critical section.
@@ -616,13 +616,13 @@ err1:
*/
struct kern_ipc_perm *ipc_obtain_object_check(struct ipc_ids *ids, int id)
{
- struct kern_ipc_perm *out = ipc_obtain_object(ids, id);
+ struct kern_ipc_perm *out = ipc_obtain_object_idr(ids, id);
if (IS_ERR(out))
goto out;
if (ipc_checkid(out, id))
- return ERR_PTR(-EIDRM);
+ return ERR_PTR(-EINVAL);
out:
return out;
}