diff options
Diffstat (limited to 'drivers/media/video/saa7164/saa7164-buffer.c')
| -rw-r--r-- | drivers/media/video/saa7164/saa7164-buffer.c | 92 |
1 files changed, 45 insertions, 47 deletions
diff --git a/drivers/media/video/saa7164/saa7164-buffer.c b/drivers/media/video/saa7164/saa7164-buffer.c index 7230912..ddd2521 100644 --- a/drivers/media/video/saa7164/saa7164-buffer.c +++ b/drivers/media/video/saa7164/saa7164-buffer.c @@ -24,46 +24,46 @@ #include "saa7164.h" /* The PCI address space for buffer handling looks like this: - - +-u32 wide-------------+ - | + - +-u64 wide------------------------------------+ - + + - +----------------------+ - | CurrentBufferPtr + Pointer to current PCI buffer >-+ - +----------------------+ | - | Unused + | - +----------------------+ | - | Pitch + = 188 (bytes) | - +----------------------+ | - | PCI buffer size + = pitch * number of lines (312) | - +----------------------+ | - |0| Buf0 Write Offset + | - +----------------------+ v - |1| Buf1 Write Offset + | - +----------------------+ | - |2| Buf2 Write Offset + | - +----------------------+ | - |3| Buf3 Write Offset + | - +----------------------+ | - ... More write offsets | - +---------------------------------------------+ | - +0| set of ptrs to PCI pagetables + | - +---------------------------------------------+ | - +1| set of ptrs to PCI pagetables + <--------+ - +---------------------------------------------+ - +2| set of ptrs to PCI pagetables + - +---------------------------------------------+ - +3| set of ptrs to PCI pagetables + >--+ - +---------------------------------------------+ | - ... More buffer pointers | +----------------+ - +->| pt[0] TS data | - | +----------------+ - | - | +----------------+ - +->| pt[1] TS data | - | +----------------+ - | etc + * + * +-u32 wide-------------+ + * | + + * +-u64 wide------------------------------------+ + * + + + * +----------------------+ + * | CurrentBufferPtr + Pointer to current PCI buffer >-+ + * +----------------------+ | + * | Unused + | + * +----------------------+ | + * | Pitch + = 188 (bytes) | + * +----------------------+ | + * | PCI buffer size + = pitch * number of lines (312) | + * +----------------------+ | + * |0| Buf0 Write Offset + | + * +----------------------+ v + * |1| Buf1 Write Offset + | + * +----------------------+ | + * |2| Buf2 Write Offset + | + * +----------------------+ | + * |3| Buf3 Write Offset + | + * +----------------------+ | + * ... More write offsets | + * +---------------------------------------------+ | + * +0| set of ptrs to PCI pagetables + | + * +---------------------------------------------+ | + * +1| set of ptrs to PCI pagetables + <--------+ + * +---------------------------------------------+ + * +2| set of ptrs to PCI pagetables + + * +---------------------------------------------+ + * +3| set of ptrs to PCI pagetables + >--+ + * +---------------------------------------------+ | + * ... More buffer pointers | +----------------+ + * +->| pt[0] TS data | + * | +----------------+ + * | + * | +----------------+ + * +->| pt[1] TS data | + * | +----------------+ + * | etc */ void saa7164_buffer_display(struct saa7164_buffer *buf) @@ -283,7 +283,8 @@ int saa7164_buffer_cfg_port(struct saa7164_port *port) return 0; } -struct saa7164_user_buffer *saa7164_buffer_alloc_user(struct saa7164_dev *dev, u32 len) +struct saa7164_user_buffer *saa7164_buffer_alloc_user(struct saa7164_dev *dev, + u32 len) { struct saa7164_user_buffer *buf; @@ -313,12 +314,9 @@ void saa7164_buffer_dealloc_user(struct saa7164_user_buffer *buf) if (!buf) return; - if (buf->data) { - kfree(buf->data); - buf->data = 0; - } + kfree(buf->data); + buf->data = 0; - if (buf) - kfree(buf); + kfree(buf); } |
