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cciss: fix scatter gather chain block dma direction kludge 

cciss: fix scatter gather chain block dma direction kludge
The data direction for the chained block of scatter gather
elements should always be PCI_DMA_TODEVICE, but was mistakenly
set to the direction of the data transfer, then a kludge to
fix it was added, in which pci_dma_sync_single_for_device or
pci_dma_sync_single_for_cpu was called.  If the correct direction
is used in the first place, the kludge isn't needed.

Signed-off-by: Stephen M. Cameron <scameron@beardog.cce.hp.com>
Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
This commit is contained in:
Stephen M. Cameron 2010-02-26 16:01:32 -06:00 committed by Jens Axboe
parent dccc9b563e
commit 2ad6cdc20f
1 changed files with 3 additions and 5 deletions
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8
drivers/block/cciss.c
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@ -1717,10 +1717,8 @@ static void cciss_softirq_done(struct request *rq)
if (curr_sg[sg_index].Ext == CCISS_SG_CHAIN) {
temp64.val32.lower = cmd->SG[i].Addr.lower;
temp64.val32.upper = cmd->SG[i].Addr.upper;
pci_dma_sync_single_for_cpu(h->pdev, temp64.val,
cmd->SG[i].Len, ddir);
pci_unmap_single(h->pdev, temp64.val,
cmd->SG[i].Len, ddir);
cmd->SG[i].Len, PCI_DMA_TODEVICE);
/* Point to the next block */
curr_sg = h->cmd_sg_list[cmd->cmdindex];
sg_index = 0;
@ -3223,11 +3221,11 @@ static void do_cciss_request(struct request_queue *q)
* block with address of next chain block.
*/
temp64.val = pci_map_single(h->pdev,
h->cmd_sg_list[c->cmdindex], len, dir);
h->cmd_sg_list[c->cmdindex], len,
PCI_DMA_TODEVICE);
dma_addr = temp64.val;
curr_sg[sg_index].Addr.lower = temp64.val32.lower;
curr_sg[sg_index].Addr.upper = temp64.val32.upper;
pci_dma_sync_single_for_device(h->pdev, dma_addr, len, dir);
}
/* track how many SG entries we are using */