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authorRobert Hancock <hancockr@shaw.ca>2007-02-19 19:02:27 -0600
committerJeff Garzik <jeff@garzik.org>2007-02-21 04:58:19 -0500
commit41949ed5c11a9d6e7af1afd62957d8d1988c803e (patch)
tree12f11d4df52e68ad40b24c95ef5e699b0f72fc7d /drivers
parent08af7414786a3f35b686f68ada3de0b202c03d8c (diff)
sata_nv: cleanup CPB and APRD initialization
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>
Diffstat (limited to 'drivers')
-rw-r--r--drivers/ata/sata_nv.c16
1 files changed, 10 insertions, 6 deletions
diff --git a/drivers/ata/sata_nv.c b/drivers/ata/sata_nv.c
index 367027bc4cd..067352da2c2 100644
--- a/drivers/ata/sata_nv.c
+++ b/drivers/ata/sata_nv.c
@@ -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)