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sata_nv: cleanup CPB and APRD initialization

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Clean up the initialization of the CPB and APRD structures so that we
strictly follow the rules for ordering of writes to the CPB flags and
response flags, and prevent duplicate initialization.

Signed-off-by: Robert Hancock <hancockr@shaw.ca>
Signed-off-by: Jeff Garzik <jeff@garzik.org>
This commit is contained in:
Robert Hancock 2007-02-19 19:02:27 -06:00 committed by Jeff Garzik
parent 08af741478
commit 41949ed5c1
1 changed files with 10 additions and 6 deletions
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16
drivers/ata/sata_nv.c
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@ -1164,11 +1164,7 @@ static void nv_adma_fill_aprd(struct ata_queued_cmd *qc,
int idx,
struct nv_adma_prd *aprd)
{
u8 flags;
memset(aprd, 0, sizeof(struct nv_adma_prd));
flags = 0;
u8 flags = 0;
if (qc->tf.flags & ATA_TFLAG_WRITE)
flags |= NV_APRD_WRITE;
if (idx == qc->n_elem - 1)
@ -1179,6 +1175,7 @@ static void nv_adma_fill_aprd(struct ata_queued_cmd *qc,
aprd->addr = cpu_to_le64(((u64)sg_dma_address(sg)));
aprd->len = cpu_to_le32(((u32)sg_dma_len(sg))); /* len in bytes */
aprd->flags = flags;
aprd->packet_len = 0;
}
static void nv_adma_fill_sg(struct ata_queued_cmd *qc, struct nv_adma_cpb *cpb)
@ -1199,6 +1196,8 @@ static void nv_adma_fill_sg(struct ata_queued_cmd *qc, struct nv_adma_cpb *cpb)
}
if (idx > 5)
cpb->next_aprd = cpu_to_le64(((u64)(pp->aprd_dma + NV_ADMA_SGTBL_SZ * qc->tag)));
else
cpb->next_aprd = cpu_to_le64(0);
}
static int nv_adma_use_reg_mode(struct ata_queued_cmd *qc)
@ -1231,7 +1230,10 @@ static void nv_adma_qc_prep(struct ata_queued_cmd *qc)
return;
}
memset(cpb, 0, sizeof(struct nv_adma_cpb));
cpb->resp_flags = NV_CPB_RESP_DONE;
wmb();
cpb->ctl_flags = 0;
wmb();
cpb->len = 3;
cpb->tag = qc->tag;
@ -1255,6 +1257,8 @@ static void nv_adma_qc_prep(struct ata_queued_cmd *qc)
finished filling in all of the contents */
wmb();
cpb->ctl_flags = ctl_flags;
wmb();
cpb->resp_flags = 0;
}
static unsigned int nv_adma_qc_issue(struct ata_queued_cmd *qc)