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path: root/drivers/media/video/bttv-risc.c
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Diffstat (limited to 'drivers/media/video/bttv-risc.c')
-rw-r--r--drivers/media/video/bttv-risc.c17
1 files changed, 10 insertions, 7 deletions
diff --git a/drivers/media/video/bttv-risc.c b/drivers/media/video/bttv-risc.c
index b40e9734bf0..344f84e9af0 100644
--- a/drivers/media/video/bttv-risc.c
+++ b/drivers/media/video/bttv-risc.c
@@ -51,8 +51,10 @@ bttv_risc_packed(struct bttv *btv, struct btcx_riscmem *risc,
int rc;
/* estimate risc mem: worst case is one write per page border +
- one write per scan line + sync + jump (all 2 dwords) */
- instructions = (bpl * lines) / PAGE_SIZE + lines;
+ one write per scan line + sync + jump (all 2 dwords). padding
+ can cause next bpl to start close to a page border. First DMA
+ region may be smaller than PAGE_SIZE */
+ instructions = 1 + ((bpl + padding) * lines) / PAGE_SIZE + lines;
instructions += 2;
if ((rc = btcx_riscmem_alloc(btv->c.pci,risc,instructions*8)) < 0)
return rc;
@@ -104,7 +106,7 @@ bttv_risc_packed(struct bttv *btv, struct btcx_riscmem *risc,
/* save pointer to jmp instruction address */
risc->jmp = rp;
- BUG_ON((risc->jmp - risc->cpu + 2) / 4 > risc->size);
+ BUG_ON((risc->jmp - risc->cpu + 2) * sizeof(*risc->cpu) > risc->size);
return 0;
}
@@ -222,7 +224,7 @@ bttv_risc_planar(struct bttv *btv, struct btcx_riscmem *risc,
/* save pointer to jmp instruction address */
risc->jmp = rp;
- BUG_ON((risc->jmp - risc->cpu + 2) / 4 > risc->size);
+ BUG_ON((risc->jmp - risc->cpu + 2) * sizeof(*risc->cpu) > risc->size);
return 0;
}
@@ -274,6 +276,8 @@ bttv_risc_overlay(struct bttv *btv, struct btcx_riscmem *risc,
if (line > maxy)
btcx_calc_skips(line, ov->w.width, &maxy,
skips, &nskips, ov->clips, ov->nclips);
+ else
+ nskips = 0;
/* write out risc code */
for (start = 0, skip = 0; start < ov->w.width; start = end) {
@@ -307,7 +311,7 @@ bttv_risc_overlay(struct bttv *btv, struct btcx_riscmem *risc,
/* save pointer to jmp instruction address */
risc->jmp = rp;
- BUG_ON((risc->jmp - risc->cpu + 2) / 4 > risc->size);
+ BUG_ON((risc->jmp - risc->cpu + 2) * sizeof(*risc->cpu) > risc->size);
kfree(skips);
return 0;
}
@@ -507,8 +511,7 @@ bttv_risc_hook(struct bttv *btv, int slot, struct btcx_riscmem *risc,
void
bttv_dma_free(struct bttv *btv, struct bttv_buffer *buf)
{
- if (in_interrupt())
- BUG();
+ BUG_ON(in_interrupt());
videobuf_waiton(&buf->vb,0,0);
videobuf_dma_pci_unmap(btv->c.pci, &buf->vb.dma);
videobuf_dma_free(&buf->vb.dma);