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>

2 files changed, 8 insertions, 32 deletions

diff --git a/drivers/media/video/cx18/cx18-queue.c b/drivers/media/video/cx18/cx18-queue.c
index f2d539f6bdf9..63304823cef5 100644
--- a/drivers/media/video/cx18/cx18-queue.c
+++ b/drivers/media/video/cx18/cx18-queue.c
@@ -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;
diff --git a/drivers/media/video/cx18/cx18-queue.h b/drivers/media/video/cx18/cx18-queue.h
index 96747e5e7c3c..88a6d34ad3bb 100644
--- a/drivers/media/video/cx18/cx18-queue.h
+++ b/drivers/media/video/cx18/cx18-queue.h
@@ -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)
 {