Commit 6f7e780b authored by Samuel Williams's avatar Samuel Williams Committed by Mauro Carvalho Chehab

media: bttv: Fixed oops error when capturing at yuv410p

When capturing at yuv410p, sg_next was called too many times when chroma is
false, eventually returning NULL. This patch does fix this for my hardware.
Signed-off-by: default avatarSamuel Williams <sam8641@gmail.com>
Signed-off-by: default avatarMauro Carvalho Chehab <mchehab+samsung@kernel.org>
parent a03e457b
......@@ -189,6 +189,12 @@ bttv_risc_planar(struct bttv *btv, struct btcx_riscmem *risc,
yoffset -= sg_dma_len(ysg);
ysg = sg_next(ysg);
}
/* calculate max number of bytes we can write */
ylen = todo;
if (yoffset + ylen > sg_dma_len(ysg))
ylen = sg_dma_len(ysg) - yoffset;
if (chroma) {
while (uoffset && uoffset >= sg_dma_len(usg)) {
uoffset -= sg_dma_len(usg);
usg = sg_next(usg);
......@@ -198,11 +204,6 @@ bttv_risc_planar(struct bttv *btv, struct btcx_riscmem *risc,
vsg = sg_next(vsg);
}
/* calculate max number of bytes we can write */
ylen = todo;
if (yoffset + ylen > sg_dma_len(ysg))
ylen = sg_dma_len(ysg) - yoffset;
if (chroma) {
if (uoffset + (ylen>>hshift) > sg_dma_len(usg))
ylen = (sg_dma_len(usg) - uoffset) << hshift;
if (voffset + (ylen>>hshift) > sg_dma_len(vsg))
......
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