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authorTejun Heo <htejun@gmail.com>2007-12-05 16:43:11 +0900
committerJeff Garzik <jeff@garzik.org>2008-01-23 05:24:14 -0500
commitff2aeb1eb64c8a4770a6304f9addbae9f9828646 (patch)
treec6febbec290ec6c40bf3abc7bcdb7188f5039443 /drivers/ata/sata_qstor.c
parentf92a26365a72333f418abe82700c6030d4a1a807 (diff)
libata: convert to chained sg
libata used private sg iterator to handle padding sg. Now that sg can be chained, padding can be handled using standard sg ops. Convert to chained sg. * s/qc->__sg/qc->sg/ * s/qc->pad_sgent/qc->extra_sg[]/. Because chaining consumes one sg entry. There need to be two extra sg entries. The renaming is also for future addition of other extra sg entries. * Padding setup is moved into ata_sg_setup_extra() which is organized in a way that future addition of other extra sg entries is easy. * qc->orig_n_elem is unused and removed. * qc->n_elem now contains the number of sg entries that LLDs should map. qc->mapped_n_elem is added to carry the original number of mapped sgs for unmapping. * The last sg of the original sg list is used to chain to extra sg list. The original last sg is pointed to by qc->last_sg and the content is stored in qc->saved_last_sg. It's restored during ata_sg_clean(). * All sg walking code has been updated. Unnecessary assertions and checks for conditions the core layer already guarantees are removed. Signed-off-by: Tejun Heo <htejun@gmail.com> Cc: Jens Axboe <jens.axboe@oracle.com> Signed-off-by: Jeff Garzik <jeff@garzik.org>
Diffstat (limited to 'drivers/ata/sata_qstor.c')
-rw-r--r--drivers/ata/sata_qstor.c13
1 files changed, 4 insertions, 9 deletions
diff --git a/drivers/ata/sata_qstor.c b/drivers/ata/sata_qstor.c
index 4e5f07bdd06..91cc12c8204 100644
--- a/drivers/ata/sata_qstor.c
+++ b/drivers/ata/sata_qstor.c
@@ -287,14 +287,10 @@ static unsigned int qs_fill_sg(struct ata_queued_cmd *qc)
struct scatterlist *sg;
struct ata_port *ap = qc->ap;
struct qs_port_priv *pp = ap->private_data;
- unsigned int nelem;
u8 *prd = pp->pkt + QS_CPB_BYTES;
+ unsigned int si;
- WARN_ON(qc->__sg == NULL);
- WARN_ON(qc->n_elem == 0 && qc->pad_len == 0);
-
- nelem = 0;
- ata_for_each_sg(sg, qc) {
+ for_each_sg(qc->sg, sg, qc->n_elem, si) {
u64 addr;
u32 len;
@@ -306,12 +302,11 @@ static unsigned int qs_fill_sg(struct ata_queued_cmd *qc)
*(__le32 *)prd = cpu_to_le32(len);
prd += sizeof(u64);
- VPRINTK("PRD[%u] = (0x%llX, 0x%X)\n", nelem,
+ VPRINTK("PRD[%u] = (0x%llX, 0x%X)\n", si,
(unsigned long long)addr, len);
- nelem++;
}
- return nelem;
+ return si;
}
static void qs_qc_prep(struct ata_queued_cmd *qc)