From b80e1074c734416987486b7b76b6479faa73f1e2 Mon Sep 17 00:00:00 2001 From: Andy Walls Date: Fri, 28 Nov 2008 00:04:21 -0300 Subject: [PATCH] V4L/DVB (9800): cx18: Eliminate q_io from stream buffer handling Eliminate q_io from stream buffer handling in anticipation of upcoming changes in buffer handling. q_io was a holdover from ivtv and it's function in cx18 was trivial and not necessary. We just push things back onto the front of q_full now, instead of maintaining a 1 buffer q_io queue. Signed-off-by: Andy Walls Signed-off-by: Mauro Carvalho Chehab --- drivers/media/video/cx18/cx18-driver.h | 1 - drivers/media/video/cx18/cx18-fileops.c | 9 ++------- drivers/media/video/cx18/cx18-queue.c | 10 ++++++---- drivers/media/video/cx18/cx18-queue.h | 19 +++++++++++++++++-- drivers/media/video/cx18/cx18-streams.c | 1 - 5 files changed, 25 insertions(+), 15 deletions(-) diff --git a/drivers/media/video/cx18/cx18-driver.h b/drivers/media/video/cx18/cx18-driver.h index 94c196a91295..f88d82348293 100644 --- a/drivers/media/video/cx18/cx18-driver.h +++ b/drivers/media/video/cx18/cx18-driver.h @@ -290,7 +290,6 @@ struct cx18_stream { /* Buffer Queues */ struct cx18_queue q_free; /* free buffers */ struct cx18_queue q_full; /* full buffers */ - struct cx18_queue q_io; /* waiting for I/O */ /* DVB / Digital Transport */ struct cx18_dvb dvb; diff --git a/drivers/media/video/cx18/cx18-fileops.c b/drivers/media/video/cx18/cx18-fileops.c index 2c8117510fb4..504a1f9edec6 100644 --- a/drivers/media/video/cx18/cx18-fileops.c +++ b/drivers/media/video/cx18/cx18-fileops.c @@ -195,11 +195,6 @@ static struct cx18_buffer *cx18_get_buffer(struct cx18_stream *s, int non_block, return buf; } - /* do we have leftover data? */ - buf = cx18_dequeue(s, &s->q_io); - if (buf) - return buf; - /* do we have new data? */ buf = cx18_dequeue(s, &s->q_full); if (buf) { @@ -375,7 +370,7 @@ static ssize_t cx18_read(struct cx18_stream *s, char __user *ubuf, cx->enc_mem, 1, buf->id, s->buf_size); } else - cx18_enqueue(s, buf, &s->q_io); + cx18_push(s, buf, &s->q_full); } else if (buf->readpos == buf->bytesused) { int idx = cx->vbi.inserted_frame % CX18_VBI_FRAMES; @@ -519,7 +514,7 @@ unsigned int cx18_v4l2_enc_poll(struct file *filp, poll_table *wait) CX18_DEBUG_HI_FILE("Encoder poll\n"); poll_wait(filp, &s->waitq, wait); - if (atomic_read(&s->q_full.buffers) || atomic_read(&s->q_io.buffers)) + if (atomic_read(&s->q_full.buffers)) return POLLIN | POLLRDNORM; if (eof) return POLLHUP; diff --git a/drivers/media/video/cx18/cx18-queue.c b/drivers/media/video/cx18/cx18-queue.c index 7b09c9a3ee8f..fdfc83ee3d4e 100644 --- a/drivers/media/video/cx18/cx18-queue.c +++ b/drivers/media/video/cx18/cx18-queue.c @@ -42,8 +42,8 @@ void cx18_queue_init(struct cx18_queue *q) q->bytesused = 0; } -void cx18_enqueue(struct cx18_stream *s, struct cx18_buffer *buf, - struct cx18_queue *q) +void _cx18_enqueue(struct cx18_stream *s, struct cx18_buffer *buf, + struct cx18_queue *q, int to_front) { /* clear the buffer if it is going to be enqueued to the free queue */ if (q == &s->q_free) { @@ -53,7 +53,10 @@ void cx18_enqueue(struct cx18_stream *s, struct cx18_buffer *buf, buf->skipped = 0; } mutex_lock(&s->qlock); - list_add_tail(&buf->list, &q->list); + if (to_front) + list_add(&buf->list, &q->list); /* LIFO */ + else + list_add_tail(&buf->list, &q->list); /* FIFO */ atomic_inc(&q->buffers); q->bytesused += buf->bytesused - buf->readpos; mutex_unlock(&s->qlock); @@ -159,7 +162,6 @@ static void cx18_queue_flush(struct cx18_stream *s, struct cx18_queue *q) void cx18_flush_queues(struct cx18_stream *s) { - cx18_queue_flush(s, &s->q_io); cx18_queue_flush(s, &s->q_full); } diff --git a/drivers/media/video/cx18/cx18-queue.h b/drivers/media/video/cx18/cx18-queue.h index ff50a2b7e5bc..d184e55ce624 100644 --- a/drivers/media/video/cx18/cx18-queue.h +++ b/drivers/media/video/cx18/cx18-queue.h @@ -43,9 +43,24 @@ static inline void cx18_buf_sync_for_device(struct cx18_stream *s, void cx18_buf_swap(struct cx18_buffer *buf); /* cx18_queue utility functions */ -void cx18_queue_init(struct cx18_queue *q); +void _cx18_enqueue(struct cx18_stream *s, struct cx18_buffer *buf, + struct cx18_queue *q, int to_front); + +static inline void cx18_enqueue(struct cx18_stream *s, struct cx18_buffer *buf, - struct cx18_queue *q); + struct cx18_queue *q) +{ + _cx18_enqueue(s, buf, q, 0); /* FIFO */ +} + +static inline +void cx18_push(struct cx18_stream *s, struct cx18_buffer *buf, + struct cx18_queue *q) +{ + _cx18_enqueue(s, buf, q, 1); /* LIFO */ +} + +void cx18_queue_init(struct cx18_queue *q); struct cx18_buffer *cx18_dequeue(struct cx18_stream *s, struct cx18_queue *q); struct cx18_buffer *cx18_queue_get_buf(struct cx18_stream *s, u32 id, u32 bytesused); diff --git a/drivers/media/video/cx18/cx18-streams.c b/drivers/media/video/cx18/cx18-streams.c index 8c8e92b20c7b..a1cf434f7975 100644 --- a/drivers/media/video/cx18/cx18-streams.c +++ b/drivers/media/video/cx18/cx18-streams.c @@ -138,7 +138,6 @@ static void cx18_stream_init(struct cx18 *cx, int type) s->id = -1; cx18_queue_init(&s->q_free); cx18_queue_init(&s->q_full); - cx18_queue_init(&s->q_io); } static int cx18_prep_dev(struct cx18 *cx, int type)