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| author | Sergei Shtylyov <sergei.shtylyov@cogentembedded.com> | 2013-05-28 00:43:23 +0200 |
|---|---|---|
| committer | Tejun Heo <tj@kernel.org> | 2013-05-28 02:18:08 +0200 |
| commit | 333279c82b984f3eac61feff2b76a8b79e3db6c8 (patch) | |
| tree | 46b7cfd948671f77e729867c93e70c9ee125c6b3 /drivers/ata | |
| parent | libata: do not limit R-Car SATA driver to shmobile (diff) | |
| download | linux-333279c82b984f3eac61feff2b76a8b79e3db6c8.tar.xz linux-333279c82b984f3eac61feff2b76a8b79e3db6c8.zip | |
sata_rcar: kill superfluous code in sata_rcar_bmdma_fill_sg()
I've modified sata_rcar_bmdma_fill_sg() to take care of splitting long
scatter/ gather segments due to the descriptor table transfer counter
being only 28 bits wide (bit 1 to bit 28) but that was in vain as even
if 'sata_rcar_sht' specified a correct 'dma_boundary' field, the DMA
and block layers would have split the S/G segments on the necassary
boundaries. Since the driver uses ATA_BMDMA_SHT() to initilaize
'sata_rcar_sht', the boundary is much smaller, only 0xFFFF, so the
code I've added is even more useless, and it's better to just remove
it.
Signed-off-by: Sergei Shtylyov <sergei.shtylyov@cogentembedded.com>
Signed-off-by: Tejun Heo <tj@kernel.org>
Diffstat (limited to 'drivers/ata')
| -rw-r--r-- | drivers/ata/sata_rcar.c | 24 |
1 files changed, 6 insertions, 18 deletions
diff --git a/drivers/ata/sata_rcar.c b/drivers/ata/sata_rcar.c index 889c25a6337e..629b07c452c5 100644 --- a/drivers/ata/sata_rcar.c +++ b/drivers/ata/sata_rcar.c @@ -474,11 +474,10 @@ static void sata_rcar_bmdma_fill_sg(struct ata_queued_cmd *qc) struct ata_port *ap = qc->ap; struct ata_bmdma_prd *prd = ap->bmdma_prd; struct scatterlist *sg; - unsigned int si, pi; + unsigned int si; - pi = 0; for_each_sg(qc->sg, sg, qc->n_elem, si) { - u32 addr, sg_len, len; + u32 addr, sg_len; /* * Note: h/w doesn't support 64-bit, so we unconditionally @@ -487,24 +486,13 @@ static void sata_rcar_bmdma_fill_sg(struct ata_queued_cmd *qc) addr = (u32)sg_dma_address(sg); sg_len = sg_dma_len(sg); - /* H/w transfer count is only 29 bits long, let's be careful */ - while (sg_len) { - len = sg_len; - if (len > 0x1ffffffe) - len = 0x1ffffffe; - - prd[pi].addr = cpu_to_le32(addr); - prd[pi].flags_len = cpu_to_le32(len); - VPRINTK("PRD[%u] = (0x%X, 0x%X)\n", pi, addr, len); - - pi++; - sg_len -= len; - addr += len; - } + prd[si].addr = cpu_to_le32(addr); + prd[si].flags_len = cpu_to_le32(sg_len); + VPRINTK("PRD[%u] = (0x%X, 0x%X)\n", si, addr, sg_len); } /* end-of-table flag */ - prd[pi - 1].addr |= cpu_to_le32(SATA_RCAR_DTEND); + prd[si - 1].addr |= cpu_to_le32(SATA_RCAR_DTEND); } static void sata_rcar_qc_prep(struct ata_queued_cmd *qc) |