V4L/DVB (6313): ivtv: Replace list_for_each+list_entry with list_for_each_entry

Also fixed a few cases of cut&paste errors where 'buf' would be set to the
first entry in the list prior to be used as the loop iterator.  In one case
the value of buf was used before it was changed, but the rest were
unnecessary.

There was one list_for_each+list_entry loop that wasn't changed, since it
depending on the loop iterator being left as NULL if the list was empty.

Signed-off-by: Trent Piepho <xyzzy@speakeasy.org>
CC: Hans Verkuil <hverkuil@xs4all.nl>
Signed-off-by: Mauro Carvalho Chehab <mchehab@infradead.org>

drivers/media/video/ivtv/ivtv-irq.c

@@ -42,7 +42,6 @@ static void ivtv_pio_work_handler(struct ivtv *itv)
 {
 	struct ivtv_stream *s = &itv->streams[itv->cur_pio_stream];
 	struct ivtv_buffer *buf;
-	struct list_head *p;
 	int i = 0;
 
 	IVTV_DEBUG_HI_DMA("ivtv_pio_work_handler\n");
@@ -54,9 +53,7 @@ static void ivtv_pio_work_handler(struct ivtv *itv)
 		return;
 	}
 	IVTV_DEBUG_HI_DMA("Process PIO %s\n", s->name);
-	buf = list_entry(s->q_dma.list.next, struct ivtv_buffer, list);
-	list_for_each(p, &s->q_dma.list) {
-		struct ivtv_buffer *buf = list_entry(p, struct ivtv_buffer, list);
+	list_for_each_entry(buf, &s->q_dma.list, list) {
 		u32 size = s->sg_processing[i].size & 0x3ffff;
 
 		/* Copy the data from the card to the buffer */
@@ -97,7 +94,6 @@ static int stream_enc_dma_append(struct ivtv_stream *s, u32 data[CX2341X_MBOX_MA
 {
 	struct ivtv *itv = s->itv;
 	struct ivtv_buffer *buf;
-	struct list_head *p;
 	u32 bytes_needed = 0;
 	u32 offset, size;
 	u32 UVoffset = 0, UVsize = 0;
@@ -202,9 +198,7 @@ static int stream_enc_dma_append(struct ivtv_stream *s, u32 data[CX2341X_MBOX_MA
 	/* got the buffers, now fill in sg_pending */
 	buf = list_entry(s->q_predma.list.next, struct ivtv_buffer, list);
 	memset(buf->buf, 0, 128);
-	list_for_each(p, &s->q_predma.list) {
-		struct ivtv_buffer *buf = list_entry(p, struct ivtv_buffer, list);
-
+	list_for_each_entry(buf, &s->q_predma.list, list) {
 		if (skip_bufs-- > 0)
 			continue;
 		s->sg_pending[idx].dst = buf->dma_handle;
@@ -289,9 +283,7 @@ static void dma_post(struct ivtv_stream *s)
 	if (buf)
 		buf->bytesused += s->dma_last_offset;
 	if (buf && s->type == IVTV_DEC_STREAM_TYPE_VBI) {
-		list_for_each(p, &s->q_dma.list) {
-			buf = list_entry(p, struct ivtv_buffer, list);
-
+		list_for_each_entry(buf, &s->q_dma.list, list) {
 			/* Parse and Groom VBI Data */
 			s->q_dma.bytesused -= buf->bytesused;
 			ivtv_process_vbi_data(itv, buf, 0, s->type);
@@ -311,7 +303,6 @@ void ivtv_dma_stream_dec_prepare(struct ivtv_stream *s, u32 offset, int lock)
 {
 	struct ivtv *itv = s->itv;
 	struct ivtv_buffer *buf;
-	struct list_head *p;
 	u32 y_size = itv->params.height * itv->params.width;
 	u32 uv_offset = offset + IVTV_YUV_BUFFER_UV_OFFSET;
 	int y_done = 0;
@@ -320,10 +311,7 @@ void ivtv_dma_stream_dec_prepare(struct ivtv_stream *s, u32 offset, int lock)
 	int idx = 0;
 
 	IVTV_DEBUG_HI_DMA("DEC PREPARE DMA %s: %08x %08x\n", s->name, s->q_predma.bytesused, offset);
-	buf = list_entry(s->q_predma.list.next, struct ivtv_buffer, list);
-	list_for_each(p, &s->q_predma.list) {
-		struct ivtv_buffer *buf = list_entry(p, struct ivtv_buffer, list);
-
+	list_for_each_entry(buf, &s->q_predma.list, list) {
 		/* YUV UV Offset from Y Buffer */
 		if (s->type == IVTV_DEC_STREAM_TYPE_YUV && !y_done && bytes_written >= y_size) {
 			offset = uv_offset;
@@ -677,11 +665,9 @@ static void ivtv_irq_enc_vbi_cap(struct ivtv *itv)
 	   we just drop the old requests when there are already three
 	   requests queued. */
 	if (s->sg_pending_size > 2) {
-		struct list_head *p;
-		list_for_each(p, &s->q_predma.list) {
-			struct ivtv_buffer *buf = list_entry(p, struct ivtv_buffer, list);
+		struct ivtv_buffer *buf;
+		list_for_each_entry(buf, &s->q_predma.list, list)
 			ivtv_buf_sync_for_cpu(s, buf);
-		}
 		ivtv_queue_move(s, &s->q_predma, NULL, &s->q_free, 0);
 		s->sg_pending_size = 0;
 	}