[RFC/RFT PATCH 2/6] uvcvideo: Convert decode functions to use new context structure

[Kieran Bingham]

From: Kieran Bingham <kieran.bingham@xxxxxxxxxxxxxxxx>

The URB completion handlers currently reference the stream context.

Now that each URB has its own context structure, convert the decode (and
one encode) functions to utilise this context for URB management.

Signed-off-by: Kieran Bingham <kieran.bingham@xxxxxxxxxxxxxxxx>
Reviewed-by: Laurent Pinchart <laurent.pinchart@xxxxxxxxxxxxxxxx>
---
 drivers/media/usb/uvc/uvc_isight.c |  4 +++-
 drivers/media/usb/uvc/uvc_video.c  | 30 ++++++++++++++++++++----------
 drivers/media/usb/uvc/uvcvideo.h   |  8 ++++----
 3 files changed, 27 insertions(+), 15 deletions(-)

diff --git a/drivers/media/usb/uvc/uvc_isight.c b/drivers/media/usb/uvc/uvc_isight.c
index 8510e7259e76..433b8b4f96e2 100644
--- a/drivers/media/usb/uvc/uvc_isight.c
+++ b/drivers/media/usb/uvc/uvc_isight.c
@@ -99,9 +99,11 @@ static int isight_decode(struct uvc_video_queue *queue, struct uvc_buffer *buf,
 	return 0;
 }
 
-void uvc_video_decode_isight(struct urb *urb, struct uvc_streaming *stream,
+void uvc_video_decode_isight(struct uvc_urb *uvc_urb,
 		struct uvc_buffer *buf)
 {
+	struct urb *urb = uvc_urb->urb;
+	struct uvc_streaming *stream = uvc_urb->stream;
 	int ret, i;
 
 	for (i = 0; i < urb->number_of_packets; ++i) {
diff --git a/drivers/media/usb/uvc/uvc_video.c b/drivers/media/usb/uvc/uvc_video.c
index 86512f6229dd..17a40c9a1fa3 100644
--- a/drivers/media/usb/uvc/uvc_video.c
+++ b/drivers/media/usb/uvc/uvc_video.c
@@ -1153,9 +1153,11 @@ static void uvc_video_validate_buffer(const struct uvc_streaming *stream,
 /*
  * Completion handler for video URBs.
  */
-static void uvc_video_decode_isoc(struct urb *urb, struct uvc_streaming *stream,
-	struct uvc_buffer *buf)
+static void uvc_video_decode_isoc(struct uvc_urb *uvc_urb,
+		struct uvc_buffer *buf)
 {
+	struct urb *urb = uvc_urb->urb;
+	struct uvc_streaming *stream = uvc_urb->stream;
 	u8 *mem;
 	int ret, i;
 
@@ -1199,9 +1201,11 @@ static void uvc_video_decode_isoc(struct urb *urb, struct uvc_streaming *stream,
 	}
 }
 
-static void uvc_video_decode_bulk(struct urb *urb, struct uvc_streaming *stream,
-	struct uvc_buffer *buf)
+static void uvc_video_decode_bulk(struct uvc_urb *uvc_urb,
+		struct uvc_buffer *buf)
 {
+	struct urb *urb = uvc_urb->urb;
+	struct uvc_streaming *stream = uvc_urb->stream;
 	u8 *mem;
 	int len, ret;
 
@@ -1266,9 +1270,12 @@ static void uvc_video_decode_bulk(struct urb *urb, struct uvc_streaming *stream,
 	}
 }
 
-static void uvc_video_encode_bulk(struct urb *urb, struct uvc_streaming *stream,
-	struct uvc_buffer *buf)
+static void uvc_video_encode_bulk(struct uvc_urb *uvc_urb,
+		struct uvc_buffer *buf)
 {
+	struct urb *urb = uvc_urb->urb;
+	struct uvc_streaming *stream = uvc_urb->stream;
+
 	u8 *mem = urb->transfer_buffer;
 	int len = stream->urb_size, ret;
 
@@ -1311,7 +1318,8 @@ static void uvc_video_encode_bulk(struct urb *urb, struct uvc_streaming *stream,
 
 static void uvc_video_complete(struct urb *urb)
 {
-	struct uvc_streaming *stream = urb->context;
+	struct uvc_urb *uvc_urb = urb->context;
+	struct uvc_streaming *stream = uvc_urb->stream;
 	struct uvc_video_queue *queue = &stream->queue;
 	struct uvc_buffer *buf = NULL;
 	unsigned long flags;
@@ -1341,7 +1349,7 @@ static void uvc_video_complete(struct urb *urb)
 				       queue);
 	spin_unlock_irqrestore(&queue->irqlock, flags);
 
-	stream->decode(urb, stream, buf);
+	stream->decode(uvc_urb, buf);
 
 	if ((ret = usb_submit_urb(urb, GFP_ATOMIC)) < 0) {
 		uvc_printk(KERN_ERR, "Failed to resubmit video URB (%d).\n",
@@ -1419,6 +1427,8 @@ static int uvc_alloc_urb_buffers(struct uvc_streaming *stream,
 				uvc_free_urb_buffers(stream);
 				break;
 			}
+
+			uvc_urb->stream = stream;
 		}
 
 		if (i == UVC_URBS) {
@@ -1517,7 +1527,7 @@ static int uvc_init_video_isoc(struct uvc_streaming *stream,
 		}
 
 		urb->dev = stream->dev->udev;
-		urb->context = stream;
+		urb->context = uvc_urb;
 		urb->pipe = usb_rcvisocpipe(stream->dev->udev,
 				ep->desc.bEndpointAddress);
 #ifndef CONFIG_DMA_NONCOHERENT
@@ -1586,7 +1596,7 @@ static int uvc_init_video_bulk(struct uvc_streaming *stream,
 
 		usb_fill_bulk_urb(urb, stream->dev->udev, pipe,
 			uvc_urb->urb_buffer, size, uvc_video_complete,
-			stream);
+			uvc_urb);
 #ifndef CONFIG_DMA_NONCOHERENT
 		urb->transfer_flags = URB_NO_TRANSFER_DMA_MAP;
 		urb->transfer_dma = uvc_urb->urb_dma;
diff --git a/drivers/media/usb/uvc/uvcvideo.h b/drivers/media/usb/uvc/uvcvideo.h
index 4afa8ce13ea7..e4bd3d68a273 100644
--- a/drivers/media/usb/uvc/uvcvideo.h
+++ b/drivers/media/usb/uvc/uvcvideo.h
@@ -483,11 +483,13 @@ struct uvc_stats_stream {
  * struct uvc_urb - URB context management structure
  *
  * @urb: described URB. Must be allocated with usb_alloc_urb()
+ * @stream: UVC streaming context
  * @urb_buffer: memory storage for the URB
  * @urb_dma: DMA coherent addressing for the urb_buffer
  */
 struct uvc_urb {
 	struct urb *urb;
+	struct uvc_streaming *stream;
 
 	char *urb_buffer;
 	dma_addr_t urb_dma;
@@ -523,8 +525,7 @@ struct uvc_streaming {
 	/* Buffers queue. */
 	unsigned int frozen : 1;
 	struct uvc_video_queue queue;
-	void (*decode) (struct urb *urb, struct uvc_streaming *video,
-			struct uvc_buffer *buf);
+	void (*decode) (struct uvc_urb *uvc_urb, struct uvc_buffer *buf);
 
 	/* Context data used by the bulk completion handler. */
 	struct {
@@ -780,8 +781,7 @@ extern struct usb_host_endpoint *uvc_find_endpoint(
 		struct usb_host_interface *alts, __u8 epaddr);
 
 /* Quirks support */
-void uvc_video_decode_isight(struct urb *urb, struct uvc_streaming *stream,
-		struct uvc_buffer *buf);
+void uvc_video_decode_isight(struct uvc_urb *uvc_urb, struct uvc_buffer *buf);
 
 /* debugfs and statistics */
 void uvc_debugfs_init(void);
-- 
git-series 0.9.1