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V4L/DVB (13433): cx18: Remove duplicate list traversal when processing incoming MDLs 

Update the incoming MDL's buffers' bytesused and sync the buffers for the cpu
in one pass instead of two.

Signed-off-by: Andy Walls <awalls@radix.net>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
This commit is contained in:
Andy Walls 2009-11-11 00:57:16 -03:00 committed by Mauro Carvalho Chehab
parent 127ce5f0ad
commit ad689d54f9
2 changed files with 8 additions and 32 deletions
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27
drivers/media/video/cx18/cx18-queue.c
View File

@ -100,8 +100,8 @@ struct cx18_mdl *cx18_dequeue(struct cx18_stream *s, struct cx18_queue *q)
return mdl;
}
static void _cx18_mdl_set_buf_bytesused(struct cx18_stream *s,
struct cx18_mdl *mdl)
static void _cx18_mdl_update_bufs_for_cpu(struct cx18_stream *s,
struct cx18_mdl *mdl)
{
struct cx18_buffer *buf;
u32 buf_size = s->buf_size;
@ -116,11 +116,12 @@ static void _cx18_mdl_set_buf_bytesused(struct cx18_stream *s,
buf->bytesused = bytesused;
bytesused = 0;
}
cx18_buf_sync_for_cpu(s, buf);
}
}
static inline void cx18_mdl_set_buf_bytesused(struct cx18_stream *s,
struct cx18_mdl *mdl)
static inline void cx18_mdl_update_bufs_for_cpu(struct cx18_stream *s,
struct cx18_mdl *mdl)
{
struct cx18_buffer *buf;
@ -129,8 +130,9 @@ static inline void cx18_mdl_set_buf_bytesused(struct cx18_stream *s,
list);
buf->bytesused = mdl->bytesused;
buf->readpos = 0;
cx18_buf_sync_for_cpu(s, buf);
} else {
_cx18_mdl_set_buf_bytesused(s, mdl);
_cx18_mdl_update_bufs_for_cpu(s, mdl);
}
}
@ -191,8 +193,7 @@ struct cx18_mdl *cx18_queue_get_mdl(struct cx18_stream *s, u32 id,
ret->bytesused = bytesused;
ret->skipped = 0;
/* 0'ed readpos, m_flags & curr_buf when mdl went on q_busy */
cx18_mdl_set_buf_bytesused(s, ret);
cx18_mdl_sync_for_cpu(s, ret);
cx18_mdl_update_bufs_for_cpu(s, ret);
if (s->type != CX18_ENC_STREAM_TYPE_TS)
set_bit(CX18_F_M_NEED_SWAP, &ret->m_flags);
}
@ -331,18 +332,6 @@ void cx18_load_queues(struct cx18_stream *s)
}
}
void _cx18_mdl_sync_for_cpu(struct cx18_stream *s, struct cx18_mdl *mdl)
{
int dma = s->dma;
u32 buf_size = s->buf_size;
struct pci_dev *pci_dev = s->cx->pci_dev;
struct cx18_buffer *buf;
list_for_each_entry(buf, &mdl->buf_list, list)
pci_dma_sync_single_for_cpu(pci_dev, buf->dma_handle,
buf_size, dma);
}
void _cx18_mdl_sync_for_device(struct cx18_stream *s, struct cx18_mdl *mdl)
{
int dma = s->dma;

13
drivers/media/video/cx18/cx18-queue.h
View File

@ -33,19 +33,6 @@ static inline void cx18_buf_sync_for_cpu(struct cx18_stream *s,
s->buf_size, s->dma);
}
void _cx18_mdl_sync_for_cpu(struct cx18_stream *s, struct cx18_mdl *mdl);
static inline void cx18_mdl_sync_for_cpu(struct cx18_stream *s,
struct cx18_mdl *mdl)
{
if (list_is_singular(&mdl->buf_list))
cx18_buf_sync_for_cpu(s, list_first_entry(&mdl->buf_list,
struct cx18_buffer,
list));
else
_cx18_mdl_sync_for_cpu(s, mdl);
}
static inline void cx18_buf_sync_for_device(struct cx18_stream *s,
struct cx18_buffer *buf)
{