staging: vc04_services: bcm2835-camera: Simplify NULL comparisons

Remove instances of explicit NULL comparisons in bcm2835-camera driver
for code compaction.

Signed-off-by: Aishwarya Pant <aishpant@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/vc04_services/bcm2835-camera/bcm2835-camera.c

@@ -250,7 +250,7 @@ static int queue_setup(struct vb2_queue *vq,
 	unsigned long size;
 
 	/* refuse queue setup if port is not configured */
-	if (dev->capture.port == NULL) {
+	if (!dev->capture.port) {
 		v4l2_err(&dev->v4l2_dev,
 			 "%s: capture port not configured\n", __func__);
 		return -EINVAL;
@@ -289,8 +289,8 @@ static int buffer_prepare(struct vb2_buffer *vb)
 	v4l2_dbg(1, bcm2835_v4l2_debug, &dev->v4l2_dev, "%s: dev:%p\n",
 		 __func__, dev);
 
-	BUG_ON(dev->capture.port == NULL);
-	BUG_ON(dev->capture.fmt == NULL);
+	BUG_ON(!dev->capture.port);
+	BUG_ON(!dev->capture.fmt);
 
 	size = dev->capture.stride * dev->capture.height;
 	if (vb2_plane_size(vb, 0) < size) {
@@ -324,14 +324,14 @@ static void buffer_cb(struct vchiq_mmal_instance *instance,
 
 	if (status != 0) {
 		/* error in transfer */
-		if (buf != NULL) {
+		if (buf) {
 			/* there was a buffer with the error so return it */
 			vb2_buffer_done(&buf->vb.vb2_buf, VB2_BUF_STATE_ERROR);
 		}
 		return;
 	} else if (length == 0) {
 		/* stream ended */
-		if (buf != NULL) {
+		if (buf) {
 			/* this should only ever happen if the port is
 			 * disabled and there are buffers still queued
 			 */
@@ -513,7 +513,7 @@ static int start_streaming(struct vb2_queue *vq, unsigned int count)
 		 __func__, dev);
 
 	/* ensure a format has actually been set */
-	if (dev->capture.port == NULL)
+	if (!dev->capture.port)
 		return -EINVAL;
 
 	if (enable_camera(dev) < 0) {
@@ -604,7 +604,7 @@ static void stop_streaming(struct vb2_queue *vq)
 	dev->capture.frame_count = 0;
 
 	/* ensure a format has actually been set */
-	if (dev->capture.port == NULL) {
+	if (!dev->capture.port) {
 		v4l2_err(&dev->v4l2_dev,
 			 "no capture port - stream not started?\n");
 		return;

drivers/staging/vc04_services/bcm2835-camera/bcm2835-camera.h

@@ -125,7 +125,7 @@ int set_framerate_params(struct bm2835_mmal_dev *dev);
 {	\
 	v4l2_dbg(level, debug, dev,	\
 "%s: w %u h %u field %u pfmt 0x%x bpl %u sz_img %u colorspace 0x%x priv %u\n", \
-		desc == NULL ? "" : desc,	\
+		!desc ? "" : desc,	\
 		(pix_fmt)->width, (pix_fmt)->height, (pix_fmt)->field,	\
 		(pix_fmt)->pixelformat, (pix_fmt)->bytesperline,	\
 		(pix_fmt)->sizeimage, (pix_fmt)->colorspace, (pix_fmt)->priv); \
@@ -135,7 +135,7 @@ int set_framerate_params(struct bm2835_mmal_dev *dev);
 	v4l2_dbg(level, debug, dev,	\
 "%s: w %u h %u l %u t %u  field %u chromakey %06X clip %p " \
 "clipcount %u bitmap %p\n", \
-		desc == NULL ? "" : desc,	\
+		!desc ? "" : desc,	\
 		(win_fmt)->w.width, (win_fmt)->w.height, \
 		(win_fmt)->w.left, (win_fmt)->w.top, \
 		(win_fmt)->field,	\

drivers/staging/vc04_services/bcm2835-camera/controls.c

@@ -909,9 +909,7 @@ static int bm2835_mmal_s_ctrl(struct v4l2_ctrl *ctrl)
 	const struct bm2835_mmal_v4l2_ctrl *mmal_ctrl = ctrl->priv;
 	int ret;
 
-	if ((mmal_ctrl == NULL) ||
-	    (mmal_ctrl->id != ctrl->id) ||
-	    (mmal_ctrl->setter == NULL)) {
+	if (!mmal_ctrl || mmal_ctrl->id != ctrl->id || !mmal_ctrl->setter) {
 		pr_warn("mmal_ctrl:%p ctrl id:%d\n", mmal_ctrl, ctrl->id);
 		return -EINVAL;
 	}

drivers/staging/vc04_services/bcm2835-camera/mmal-vchiq.c

@@ -657,7 +657,7 @@ static void service_callback(void *param,
 			 * should be verified the address lies in the kernel
 			 * address space.
 			 */
-			if (msg->h.context == NULL) {
+			if (!msg->h.context) {
 				pr_err("received message context was null!\n");
 				vchi_held_msg_release(&msg_handle);
 				break;
@@ -1387,7 +1387,7 @@ static int port_enable(struct vchiq_mmal_instance *instance,
 		return 0;
 
 	/* ensure there are enough buffers queued to cover the buffer headers */
-	if (port->buffer_cb != NULL) {
+	if (port->buffer_cb) {
 		hdr_count = 0;
 		list_for_each(buf_head, &port->buffers) {
 			hdr_count++;
@@ -1547,7 +1547,7 @@ int vchiq_mmal_port_connect_tunnel(struct vchiq_mmal_instance *instance,
 		return -EINTR;
 
 	/* disconnect ports if connected */
-	if (src->connected != NULL) {
+	if (src->connected) {
 		ret = port_disable(instance, src);
 		if (ret) {
 			pr_err("failed disabling src port(%d)\n", ret);
@@ -1570,7 +1570,7 @@ int vchiq_mmal_port_connect_tunnel(struct vchiq_mmal_instance *instance,
 		src->connected = NULL;
 	}
 
-	if (dst == NULL) {
+	if (!dst) {
 		/* do not make new connection */
 		ret = 0;
 		pr_debug("not making new connection\n");
@@ -1817,7 +1817,7 @@ int vchiq_mmal_finalise(struct vchiq_mmal_instance *instance)
 {
 	int status = 0;
 
-	if (instance == NULL)
+	if (!instance)
 		return -EINVAL;
 
 	if (mutex_lock_interruptible(&instance->vchiq_mutex))