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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 <awalls@radix.net>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
This commit is contained in:
Andy Walls 2008-11-28 00:04:21 -03:00 committed by Mauro Carvalho Chehab
parent be2c6db122
commit b80e1074c7
5 changed files with 25 additions and 15 deletions

View File

@ -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;

View File

@ -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;

View File

@ -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);
}

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@ -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);

View File

@ -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)