media: cx231xx: Use EP5_BUF_SIZE macro

As Andrzej suggested, use EP5_BUF_SIZE macro to replace the other three
places of 4096 in cx231xx with EP5_BUF_SIZE.
Signed-off-by: Jinjie Ruan <ruanjinjie@huawei.com>
Suggested-by: Andrzej Pietrasiewicz <andrzej.p@collabora.com>
Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>

drivers/media/usb/cx231xx/cx231xx-417.c

@@ -937,7 +937,6 @@ static int cx231xx_load_firmware(struct cx231xx *dev)
 	u32 *p_current_fw, *p_fw;
 	u32 *p_fw_data;
 	int frame = 0;
-	u16 _buffer_size = 4096;
 	u8 *p_buffer;
 
 	p_current_fw = vmalloc(1884180 * 4);
@@ -947,7 +946,7 @@ static int cx231xx_load_firmware(struct cx231xx *dev)
 		return -ENOMEM;
 	}
 
-	p_buffer = vmalloc(4096);
+	p_buffer = vmalloc(EP5_BUF_SIZE);
 	if (p_buffer == NULL) {
 		dprintk(2, "FAIL!!!\n");
 		vfree(p_current_fw);
@@ -1030,9 +1029,9 @@ static int cx231xx_load_firmware(struct cx231xx *dev)
 
 	/*download the firmware by ep5-out*/
 
-	for (frame = 0; frame < (int)(CX231xx_FIRM_IMAGE_SIZE*20/_buffer_size);
+	for (frame = 0; frame < (int)(CX231xx_FIRM_IMAGE_SIZE*20/EP5_BUF_SIZE);
 	     frame++) {
-		for (i = 0; i < _buffer_size; i++) {
+		for (i = 0; i < EP5_BUF_SIZE; i++) {
 			*(p_buffer + i) = (u8)(*(p_fw + (frame * 128 * 8 + (i / 4))) & 0x000000FF);
 			i++;
 			*(p_buffer + i) = (u8)((*(p_fw + (frame * 128 * 8 + (i / 4))) & 0x0000FF00) >> 8);
@@ -1041,7 +1040,7 @@ static int cx231xx_load_firmware(struct cx231xx *dev)
 			i++;
 			*(p_buffer + i) = (u8)((*(p_fw + (frame * 128 * 8 + (i / 4))) & 0xFF000000) >> 24);
 		}
-		cx231xx_ep5_bulkout(dev, p_buffer, _buffer_size);
+		cx231xx_ep5_bulkout(dev, p_buffer, EP5_BUF_SIZE);
 	}
 
 	p_current_fw = p_fw;

drivers/media/usb/cx231xx/cx231xx-core.c

@@ -993,7 +993,7 @@ int cx231xx_init_isoc(struct cx231xx *dev, int max_packets,
 	/* De-allocates all pending stuff */
 	cx231xx_uninit_isoc(dev);
 
-	dma_q->p_left_data = kzalloc(4096, GFP_KERNEL);
+	dma_q->p_left_data = kzalloc(EP5_BUF_SIZE, GFP_KERNEL);
 	if (dma_q->p_left_data == NULL)
 		return -ENOMEM;