greybus: kill gbuf->complete

The gbuf complete method is a callback that allows the creator of a
gbuf to know when all processing on a gbuf is done.

We now only ever allocate gbufs for use in Greybus operations, and
in that case we only ever supply gb_operation_gbuf_complete() as the
completion callback.  Furthermore, the only place gbuf->complete()
is called is in gb_operation_recv_work().

Knowing this, we can just call gb_operation_gbuf_complete() directly
from gb_operation_recv_work(), and get rid of the gbuf->complete()
method entirely.
Signed-off-by: Alex Elder <elder@linaro.org>
Signed-off-by: Greg Kroah-Hartman <greg@kroah.com>

drivers/staging/greybus/gbuf.c

@@ -35,7 +35,6 @@ static struct kmem_cache *gbuf_head_cache;
  * hardware designers for this issue...
  */
 struct gbuf *greybus_alloc_gbuf(struct gb_operation *operation,
-				gbuf_complete_t complete,
 				unsigned int size,
 				bool outbound,
 				gfp_t gfp_mask)
@@ -51,7 +50,6 @@ struct gbuf *greybus_alloc_gbuf(struct gb_operation *operation,
 	kref_init(&gbuf->kref);
 	gbuf->operation = operation;
 	gbuf->outbound = outbound;
-	gbuf->complete = complete;
 	gbuf->status = -EBADR;	/* Initial value--means "never set" */
 
 	/* Host controller specific allocation for the actual buffer */

drivers/staging/greybus/greybus.h

@@ -118,11 +118,6 @@
 
 */
 
-
-struct gbuf;
-
-typedef void (*gbuf_complete_t)(struct gbuf *gbuf);
-
 struct gbuf {
 	struct kref kref;
 
@@ -134,7 +129,6 @@ struct gbuf {
 	bool outbound;			/* AP-relative data direction */
 
 	void *hcd_data;			/* for the HCD to track the gbuf */
-	gbuf_complete_t complete;
 };
 
 
@@ -193,8 +187,8 @@ void greybus_cport_in(struct greybus_host_device *hd, u16 cport_id,
 			u8 *data, size_t length);
 
 struct gbuf *greybus_alloc_gbuf(struct gb_operation *operation,
-				gbuf_complete_t complete, unsigned int size,
-				bool outbound, gfp_t gfp_mask);
+				unsigned int size, bool outbound,
+				gfp_t gfp_mask);
 void greybus_free_gbuf(struct gbuf *gbuf);
 struct gbuf *greybus_get_gbuf(struct gbuf *gbuf);
 #define greybus_put_gbuf	greybus_free_gbuf

drivers/staging/greybus/operation.c

@@ -264,7 +264,7 @@ static void gb_operation_recv_work(struct work_struct *recv_work)
 		gbuf = operation->request;
 	else
 		gbuf = operation->response;
-	gbuf->complete(gbuf);
+	gb_operation_gbuf_complete(gbuf);
 }
 
 /*
@@ -302,8 +302,7 @@ static struct gbuf *gb_operation_gbuf_create(struct gb_operation *operation,
 	gfp_t gfp_flags = data_out ? GFP_KERNEL : GFP_ATOMIC;
 
 	size += sizeof(*header);
-	gbuf = greybus_alloc_gbuf(operation, gb_operation_gbuf_complete,
-					size, data_out, gfp_flags);
+	gbuf = greybus_alloc_gbuf(operation, size, data_out, gfp_flags);
 	if (!gbuf)
 		return NULL;