V4L/DVB: v4l videobuf: use struct videobuf_buffer * instead of void * for videobuf_alloc

videobuf_alloc() returned a void *. Change to struct videobuf_buffer *
to get better type checking.
Signed-off-by: NHans Verkuil <hverkuil@xs4all.nl>
Signed-off-by: NMauro Carvalho Chehab <mchehab@redhat.com>

drivers/media/video/videobuf-core.c

@@ -52,7 +52,7 @@ MODULE_LICENSE("GPL");
 #define CALL(q, f, arg...)						\
 	((q->int_ops->f) ? q->int_ops->f(arg) : 0)
 
-void *videobuf_alloc(struct videobuf_queue *q)
+struct videobuf_buffer *videobuf_alloc(struct videobuf_queue *q)
 {
 	struct videobuf_buffer *vb;
 

drivers/media/video/videobuf-dma-contig.c

@@ -190,7 +190,7 @@ static int videobuf_dma_contig_user_get(struct videobuf_dma_contig_memory *mem,
 	return ret;
 }
 
-static void *__videobuf_alloc(size_t size)
+static struct videobuf_buffer *__videobuf_alloc(size_t size)
 {
 	struct videobuf_dma_contig_memory *mem;
 	struct videobuf_buffer *vb;

drivers/media/video/videobuf-dma-sg.c

@@ -439,7 +439,7 @@ static const struct vm_operations_struct videobuf_vm_ops = {
 	struct videobuf_dma_sg_memory
  */
 
-static void *__videobuf_alloc(size_t size)
+static struct videobuf_buffer *__videobuf_alloc(size_t size)
 {
 	struct videobuf_dma_sg_memory *mem;
 	struct videobuf_buffer *vb;

drivers/media/video/videobuf-vmalloc.c

@@ -135,7 +135,7 @@ static const struct vm_operations_struct videobuf_vm_ops = {
 	struct videobuf_dma_sg_memory
  */
 
-static void *__videobuf_alloc(size_t size)
+static struct videobuf_buffer *__videobuf_alloc(size_t size)
 {
 	struct videobuf_vmalloc_memory *mem;
 	struct videobuf_buffer *vb;

include/media/videobuf-core.h

@@ -127,7 +127,7 @@ struct videobuf_queue_ops {
 struct videobuf_qtype_ops {
 	u32                     magic;
 
-	void *(*alloc)		(size_t size);
+	struct videobuf_buffer *(*alloc)(size_t size);
 	void *(*vmalloc)	(struct videobuf_buffer *buf);
 	int (*iolock)		(struct videobuf_queue *q,
 				 struct videobuf_buffer *vb,
@@ -182,7 +182,7 @@ int videobuf_waiton(struct videobuf_buffer *vb, int non_blocking, int intr);
 int videobuf_iolock(struct videobuf_queue *q, struct videobuf_buffer *vb,
 		struct v4l2_framebuffer *fbuf);
 
-void *videobuf_alloc(struct videobuf_queue* q);
+struct videobuf_buffer *videobuf_alloc(struct videobuf_queue *q);
 
 /* Used on videobuf-dvb */
 void *videobuf_queue_to_vmalloc(struct videobuf_queue *q,