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[media] bttv/cx25821/cx88/ivtv: use sg_next instead of sg++

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Never use sg++, always use sg = sg_next(sg). Scatterlist entries can
be combined if the memory is contiguous but sg++ won't know about that.

As far as I can tell cx88 and ivtv are really broken because of this,
and bttv and cx25821 are OK because vb1 doesn't combine scatterlist
entries.

But regardless, sg++ should never be used, only sg_next is safe.

Signed-off-by: Hans Verkuil <hans.verkuil@cisco.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@osg.samsung.com>
This commit is contained in:
Hans Verkuil 2014-11-21 07:57:12 -03:00 committed by Mauro Carvalho Chehab
parent 6dfa513180
commit 872dfcfe82
4 changed files with 16 additions and 16 deletions
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12
drivers/media/pci/bt8xx/bttv-risc.c
View file

@ -84,7 +84,7 @@ bttv_risc_packed(struct bttv *btv, struct btcx_riscmem *risc,
continue;
while (offset && offset >= sg_dma_len(sg)) {
offset -= sg_dma_len(sg);
sg++;
sg = sg_next(sg);
}
if (bpl <= sg_dma_len(sg)-offset) {
/* fits into current chunk */
@ -100,13 +100,13 @@ bttv_risc_packed(struct bttv *btv, struct btcx_riscmem *risc,
*(rp++)=cpu_to_le32(sg_dma_address(sg)+offset);
todo -= (sg_dma_len(sg)-offset);
offset = 0;
sg++;
sg = sg_next(sg);
while (todo > sg_dma_len(sg)) {
*(rp++)=cpu_to_le32(BT848_RISC_WRITE|
sg_dma_len(sg));
*(rp++)=cpu_to_le32(sg_dma_address(sg));
todo -= sg_dma_len(sg);
sg++;
sg = sg_next(sg);
}
*(rp++)=cpu_to_le32(BT848_RISC_WRITE|BT848_RISC_EOL|
todo);
@ -187,15 +187,15 @@ bttv_risc_planar(struct bttv *btv, struct btcx_riscmem *risc,
/* go to next sg entry if needed */
while (yoffset && yoffset >= sg_dma_len(ysg)) {
yoffset -= sg_dma_len(ysg);
ysg++;
ysg = sg_next(ysg);
}
while (uoffset && uoffset >= sg_dma_len(usg)) {
uoffset -= sg_dma_len(usg);
usg++;
usg = sg_next(usg);
}
while (voffset && voffset >= sg_dma_len(vsg)) {
voffset -= sg_dma_len(vsg);
vsg++;
vsg = sg_next(vsg);
}
/* calculate max number of bytes we can write */

12
drivers/media/pci/cx25821/cx25821-core.c
View file

@ -996,7 +996,7 @@ static __le32 *cx25821_risc_field(__le32 * rp, struct scatterlist *sglist,
for (line = 0; line < lines; line++) {
while (offset && offset >= sg_dma_len(sg)) {
offset -= sg_dma_len(sg);
sg++;
sg = sg_next(sg);
}
if (bpl <= sg_dma_len(sg) - offset) {
/* fits into current chunk */
@ -1014,14 +1014,14 @@ static __le32 *cx25821_risc_field(__le32 * rp, struct scatterlist *sglist,
*(rp++) = cpu_to_le32(0); /* bits 63-32 */
todo -= (sg_dma_len(sg) - offset);
offset = 0;
sg++;
sg = sg_next(sg);
while (todo > sg_dma_len(sg)) {
*(rp++) = cpu_to_le32(RISC_WRITE |
sg_dma_len(sg));
*(rp++) = cpu_to_le32(sg_dma_address(sg));
*(rp++) = cpu_to_le32(0); /* bits 63-32 */
todo -= sg_dma_len(sg);
sg++;
sg = sg_next(sg);
}
*(rp++) = cpu_to_le32(RISC_WRITE | RISC_EOL | todo);
*(rp++) = cpu_to_le32(sg_dma_address(sg));
@ -1101,7 +1101,7 @@ static __le32 *cx25821_risc_field_audio(__le32 * rp, struct scatterlist *sglist,
for (line = 0; line < lines; line++) {
while (offset && offset >= sg_dma_len(sg)) {
offset -= sg_dma_len(sg);
sg++;
sg = sg_next(sg);
}
if (lpi && line > 0 && !(line % lpi))
@ -1125,14 +1125,14 @@ static __le32 *cx25821_risc_field_audio(__le32 * rp, struct scatterlist *sglist,
*(rp++) = cpu_to_le32(0); /* bits 63-32 */
todo -= (sg_dma_len(sg) - offset);
offset = 0;
sg++;
sg = sg_next(sg);
while (todo > sg_dma_len(sg)) {
*(rp++) = cpu_to_le32(RISC_WRITE |
sg_dma_len(sg));
*(rp++) = cpu_to_le32(sg_dma_address(sg));
*(rp++) = cpu_to_le32(0); /* bits 63-32 */
todo -= sg_dma_len(sg);
sg++;
sg = sg_next(sg);
}
*(rp++) = cpu_to_le32(RISC_WRITE | RISC_EOL | todo);
*(rp++) = cpu_to_le32(sg_dma_address(sg));

6
drivers/media/pci/cx88/cx88-core.c
View file

@ -95,7 +95,7 @@ static __le32* cx88_risc_field(__le32 *rp, struct scatterlist *sglist,
for (line = 0; line < lines; line++) {
while (offset && offset >= sg_dma_len(sg)) {
offset -= sg_dma_len(sg);
sg++;
sg = sg_next(sg);
}
if (lpi && line>0 && !(line % lpi))
sol = RISC_SOL | RISC_IRQ1 | RISC_CNT_INC;
@ -114,13 +114,13 @@ static __le32* cx88_risc_field(__le32 *rp, struct scatterlist *sglist,
*(rp++)=cpu_to_le32(sg_dma_address(sg)+offset);
todo -= (sg_dma_len(sg)-offset);
offset = 0;
sg++;
sg = sg_next(sg);
while (todo > sg_dma_len(sg)) {
*(rp++)=cpu_to_le32(RISC_WRITE|
sg_dma_len(sg));
*(rp++)=cpu_to_le32(sg_dma_address(sg));
todo -= sg_dma_len(sg);
sg++;
sg = sg_next(sg);
}
*(rp++)=cpu_to_le32(RISC_WRITE|RISC_EOL|todo);
*(rp++)=cpu_to_le32(sg_dma_address(sg));

2
drivers/media/pci/ivtv/ivtv-udma.c
View file

@ -76,7 +76,7 @@ void ivtv_udma_fill_sg_array (struct ivtv_user_dma *dma, u32 buffer_offset, u32
int i;
struct scatterlist *sg;
for (i = 0, sg = dma->SGlist; i < dma->SG_length; i++, sg++) {
for (i = 0, sg = dma->SGlist; i < dma->SG_length; i++, sg = sg_next(sg)) {
dma->SGarray[i].size = cpu_to_le32(sg_dma_len(sg));
dma->SGarray[i].src = cpu_to_le32(sg_dma_address(sg));
dma->SGarray[i].dst = cpu_to_le32(buffer_offset);