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[media] em28xx: refactor get_next_buf() and use it for vbi data, too 

get_next_buf() and vbi_get_next_buf() do exactly the same just with a
different dma queue and buffer. Saving the new buffer pointer back to the
device struct in em28xx_urb_data_copy() instead of doing this from inside
these functions makes it possible to get rid of one of them.
Also refactor the function parameters and return type:
- pass a pointer to struct em28xx as parameter (instead of obtaining the
  pointer from the dma queue pointer with the container_of macro) like we do
  it in all other functions
- instead of using a pointer-pointer, return the pointer to the new buffer
  as return value of the function

Signed-off-by: Frank Schäfer <fschaefer.oss@googlemail.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
This commit is contained in:
Frank Schaefer 2012-12-08 11:31:24 -03:00 committed by Mauro Carvalho Chehab
parent 960da93ba5
commit 24a6d8497f
1 changed files with 15 additions and 43 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

58
drivers/media/usb/em28xx/em28xx-video.c
View File

@ -359,57 +359,26 @@ static inline void print_err_status(struct em28xx *dev,
}
/*
* video-buf generic routine to get the next available buffer
* get the next available buffer from dma queue
*/
static inline void get_next_buf(struct em28xx_dmaqueue *dma_q,
struct em28xx_buffer **buf)
static inline struct em28xx_buffer *get_next_buf(struct em28xx *dev,
struct em28xx_dmaqueue *dma_q)
{
struct em28xx *dev = container_of(dma_q, struct em28xx, vidq);
struct em28xx_buffer *buf;
char *outp;
if (list_empty(&dma_q->active)) {
em28xx_isocdbg("No active queue to serve\n");
dev->usb_ctl.vid_buf = NULL;
*buf = NULL;
return;
return NULL;
}
/* Get the next buffer */
*buf = list_entry(dma_q->active.next, struct em28xx_buffer, vb.queue);
buf = list_entry(dma_q->active.next, struct em28xx_buffer, vb.queue);
/* Cleans up buffer - Useful for testing for frame/URB loss */
outp = videobuf_to_vmalloc(&(*buf)->vb);
memset(outp, 0, (*buf)->vb.size);
outp = videobuf_to_vmalloc(&buf->vb);
memset(outp, 0, buf->vb.size);
dev->usb_ctl.vid_buf = *buf;
return;
}
/*
* video-buf generic routine to get the next available VBI buffer
*/
static inline void vbi_get_next_buf(struct em28xx_dmaqueue *dma_q,
struct em28xx_buffer **buf)
{
struct em28xx *dev = container_of(dma_q, struct em28xx, vbiq);
char *outp;
if (list_empty(&dma_q->active)) {
em28xx_isocdbg("No active queue to serve\n");
dev->usb_ctl.vbi_buf = NULL;
*buf = NULL;
return;
}
/* Get the next buffer */
*buf = list_entry(dma_q->active.next, struct em28xx_buffer, vb.queue);
/* Cleans up buffer - Useful for testing for frame/URB loss */
outp = videobuf_to_vmalloc(&(*buf)->vb);
memset(outp, 0x00, (*buf)->vb.size);
dev->usb_ctl.vbi_buf = *buf;
return;
return buf;
}
/* Processes and copies the URB data content (video and VBI data) */
@ -519,7 +488,8 @@ static inline int em28xx_urb_data_copy(struct em28xx *dev, struct urb *urb)
vbi_buffer_filled(dev,
vbi_dma_q,
vbi_buf);
vbi_get_next_buf(vbi_dma_q, &vbi_buf);
vbi_buf = get_next_buf(dev, vbi_dma_q);
dev->usb_ctl.vbi_buf = vbi_buf;
if (vbi_buf == NULL)
vbioutp = NULL;
else
@ -530,7 +500,8 @@ static inline int em28xx_urb_data_copy(struct em28xx *dev, struct urb *urb)
if (dev->vbi_read == 0) {
vbi_dma_q->pos = 0;
if (vbi_buf != NULL)
vbi_buf->top_field = dev->top_field;
vbi_buf->top_field
= dev->top_field;
}
dev->vbi_read += len;
@ -554,7 +525,8 @@ static inline int em28xx_urb_data_copy(struct em28xx *dev, struct urb *urb)
if (dev->progressive || dev->top_field) {
if (buf != NULL)
buffer_filled(dev, dma_q, buf);
get_next_buf(dma_q, &buf);
buf = get_next_buf(dev, dma_q);
dev->usb_ctl.vid_buf = buf;
if (buf == NULL)
outp = NULL;
else