mei: drop mei_io_cb_alloc_buf

mei_io_cb_alloc_buf have a single caller :mei_cl_alloc_cb. After amthif
stopped using it, the code can be integrated into the caller and the
function can be dropped.
Signed-off-by: Alexander Usyskin <alexander.usyskin@intel.com>
Signed-off-by: Tomas Winkler <tomas.winkler@intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/misc/mei/client.c

@@ -419,31 +419,6 @@ static inline void mei_io_list_free(struct mei_cl_cb *list, struct mei_cl *cl)
 	__mei_io_list_flush(list, cl, true);
 }
 
-/**
- * mei_io_cb_alloc_buf - allocate callback buffer
- *
- * @cb: io callback structure
- * @length: size of the buffer
- *
- * Return: 0 on success
- *         -EINVAL if cb is NULL
- *         -ENOMEM if allocation failed
- */
-int mei_io_cb_alloc_buf(struct mei_cl_cb *cb, size_t length)
-{
-	if (!cb)
-		return -EINVAL;
-
-	if (length == 0)
-		return 0;
-
-	cb->buf.data = kmalloc(length, GFP_KERNEL);
-	if (!cb->buf.data)
-		return -ENOMEM;
-	cb->buf.size = length;
-	return 0;
-}
-
 /**
  * mei_cl_alloc_cb - a convenient wrapper for allocating read cb
  *
@@ -464,10 +439,15 @@ struct mei_cl_cb *mei_cl_alloc_cb(struct mei_cl *cl, size_t length,
 	if (!cb)
 		return NULL;
 
-	if (mei_io_cb_alloc_buf(cb, length)) {
+	if (length == 0)
+		return cb;
+
+	cb->buf.data = kmalloc(length, GFP_KERNEL);
+	if (!cb->buf.data) {
 		mei_io_cb_free(cb);
 		return NULL;
 	}
+	cb->buf.size = length;
 
 	return cb;
 }

drivers/misc/mei/client.h

@@ -85,8 +85,6 @@ static inline u8 mei_me_cl_ver(const struct mei_me_client *me_cl)
 struct mei_cl_cb *mei_io_cb_init(struct mei_cl *cl, enum mei_cb_file_ops type,
 				 const struct file *fp);
 void mei_io_cb_free(struct mei_cl_cb *priv_cb);
-int mei_io_cb_alloc_buf(struct mei_cl_cb *cb, size_t length);
-
 
 /**
  * mei_io_list_init - Sets up a queue list.