Oct 23 2012

[media] cx23885: Replace memcpy with struct assignment 

Author: Ezequiel Garcia <elezegarcia@gmail.com>

This kind of memcpy() is error-prone. Its replacement with a struct
assignment is prefered because it's type-safe and much easier to read.
Found by coccinelle. Hand patched and reviewed.
Tested by compilation only.
A simplified version of the semantic match that finds this problem is as
follows: (http://coccinelle.lip6.fr/)
// 
@@
identifier struct_name;
struct struct_name to;
struct struct_name from;
expression E;
@@
-memcpy(&(to), &(from), E);
+to = from;
// 

Signed-off-by: Peter Senna Tschudin 
Signed-off-by: Ezequiel Garcia 
Reviewed-by: Andy Walls 
Signed-off-by: Andy Walls 
Signed-off-by: Mauro Carvalho Chehab 

---
 drivers/media/pci/cx23885/cx23885-video.c | 3 +--
 drivers/media/pci/cx23885/cx23888-ir.c    | 6 ++----
 2 files changed, 3 insertions(+), 6 deletions(-)
 
diff --git a/drivers/media/pci/cx23885/cx23885-video.c b/drivers/media/pci/cx23885/cx23885-video.c
index 0e80ba4..5991bc8 100644
--- a/drivers/media/pci/cx23885/cx23885-video.c
+++ b/drivers/media/pci/cx23885/cx23885-video.c
@@ -1819,8 +1819,7 @@ int cx23885_video_register(struct cx23885_dev *dev)
 	spin_lock_init(&dev->slock);
 
 	/* Initialize VBI template */
-	memcpy(&cx23885_vbi_template, &cx23885_video_template,
-		sizeof(cx23885_vbi_template));
+	cx23885_vbi_template = cx23885_video_template;
 	strcpy(cx23885_vbi_template.name, "cx23885-vbi");
 
 	dev->tvnorm = cx23885_video_template.current_norm;
diff --git a/drivers/media/pci/cx23885/cx23888-ir.c b/drivers/media/pci/cx23885/cx23888-ir.c
index c4bd1e9..d51eed0 100644
--- a/drivers/media/pci/cx23885/cx23888-ir.c
+++ b/drivers/media/pci/cx23885/cx23888-ir.c
@@ -1237,13 +1237,11 @@ int cx23888_ir_probe(struct cx23885_dev *dev)
 		cx23888_ir_write4(dev, CX23888_IR_IRQEN_REG, 0);
 
 		mutex_init(&state->rx_params_lock);
-		memcpy(&default_params, &default_rx_params,
-		       sizeof(struct v4l2_subdev_ir_parameters));
+		default_params = default_rx_params;
 		v4l2_subdev_call(sd, ir, rx_s_parameters, &default_params);
 
 		mutex_init(&state->tx_params_lock);
-		memcpy(&default_params, &default_tx_params,
-		       sizeof(struct v4l2_subdev_ir_parameters));
+		default_params = default_tx_params;
 		v4l2_subdev_call(sd, ir, tx_s_parameters, &default_params);
 	} else {
 		kfifo_free(&state->rx_kfifo);

qlambert