greybus: remove gbuf->context

A gbuf now records a pointer to its operation.   The only thing ever
stored in a gbuf context pointer is the gbuf's operation.  Therefore
there's no longer any need to maintain the context pointer, so get
rid of it.
Signed-off-by: Alex Elder <elder@linaro.org>
Signed-off-by: Greg Kroah-Hartman <greg@kroah.com>

drivers/staging/greybus/gbuf.c

@@ -28,7 +28,6 @@ static struct kmem_cache *gbuf_head_cache;
  * @complete: callback when the gbuf is finished with
  * @size: size of the buffer
  * @gfp_mask: allocation mask
- * @context: context added to the gbuf by the driver
  *
  * TODO: someday it will be nice to handle DMA, but for now, due to the
  * architecture we are stuck with, the greybus core has to allocate the buffer
@@ -39,8 +38,7 @@ struct gbuf *greybus_alloc_gbuf(struct gb_operation *operation,
 				gbuf_complete_t complete,
 				unsigned int size,
 				bool outbound,
-				gfp_t gfp_mask,
-				void *context)
+				gfp_t gfp_mask)
 {
 	struct greybus_host_device *hd = operation->connection->hd;
 	struct gbuf *gbuf;
@@ -54,7 +52,6 @@ struct gbuf *greybus_alloc_gbuf(struct gb_operation *operation,
 	gbuf->operation = operation;
 	gbuf->outbound = outbound;
 	gbuf->complete = complete;
-	gbuf->context = context;
 	gbuf->status = -EBADR;	/* Initial value--means "never set" */
 
 	/* Host controller specific allocation for the actual buffer */

drivers/staging/greybus/greybus.h

@@ -133,7 +133,6 @@ struct gbuf {
 
 	bool outbound;			/* AP-relative data direction */
 
-	void *context;
 	void *hcd_data;			/* for the HCD to track the gbuf */
 	gbuf_complete_t complete;
 };
@@ -196,7 +195,7 @@ void greybus_gbuf_finished(struct gbuf *gbuf);
 
 struct gbuf *greybus_alloc_gbuf(struct gb_operation *operation,
 				gbuf_complete_t complete, unsigned int size,
-				bool outbound, gfp_t gfp_mask, void *context);
+				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

@@ -256,7 +256,7 @@ static void operation_timeout(struct work_struct *work)
 static void gb_operation_gbuf_complete(struct gbuf *gbuf)
 {
 	if (gbuf->status) {
-		struct gb_operation *operation = gbuf->context;
+		struct gb_operation *operation = gbuf->operation;
 		struct gb_operation_msg_hdr *header;
 		int id;
 		int type;
@@ -301,7 +301,7 @@ static struct gbuf *gb_operation_gbuf_create(struct gb_operation *operation,
 
 	size += sizeof(*header);
 	gbuf = greybus_alloc_gbuf(operation, gb_operation_gbuf_complete,
-					size, data_out, gfp_flags, operation);
+					size, data_out, gfp_flags);
 	if (!gbuf)
 		return NULL;