ipc/util.c: use __seq_open_private() instead of seq_open()

Using __seq_open_private() removes boilerplate code from
sysvipc_proc_open().

The resultant code is shorter and easier to follow.

However, please note that __seq_open_private() call kzalloc() rather than
kmalloc() which may affect timing due to the memory initialisation
overhead.

Signed-off-by: Rob Jones <rob.jones@codethink.co.uk>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 4 insertions, 16 deletions

diff --git a/ipc/util.c b/ipc/util.c
index d73b7af581e2..88adc329888c 100644
--- a/ipc/util.c
+++ b/ipc/util.c
@@ -892,28 +892,16 @@ static const struct seq_operations sysvipc_proc_seqops = {
 
 static int sysvipc_proc_open(struct inode *inode, struct file *file)
 {
-        int ret;
-        struct seq_file *seq;
         struct ipc_proc_iter *iter;
 
-        ret = -ENOMEM;
-        iter = kmalloc(sizeof(*iter), GFP_KERNEL);
+        iter = __seq_open_private(file, &sysvipc_proc_seqops, sizeof(*iter));
         if (!iter)
-                goto out;
-
-        ret = seq_open(file, &sysvipc_proc_seqops);
-        if (ret) {
-                kfree(iter);
-                goto out;
-        }
-
-        seq = file->private_data;
-        seq->private = iter;
+                return -ENOMEM;
 
         iter->iface = PDE_DATA(inode);
         iter->ns    = get_ipc_ns(current->nsproxy->ipc_ns);
-out:
-        return ret;
+
+        return 0;
 }
 
 static int sysvipc_proc_release(struct inode *inode, struct file *file)