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Date: Fri, 26 Feb 2010 16:01:32 -0600 From: "Stephen M. Cameron" <scameron@...rdog.cce.hp.com> To: axboe@...nel.dk, akpm@...ux-foundation.org, james.bottomley@...e.de Cc: linux-kernel@...r.kernel.org, mikem@...rdog.cce.hp.com, linux-scsi@...r.kernel.org, brace@...rdog.cce.hp.com Subject: [PATCH 5/9] cciss: fix scatter gather chain block dma direction kludge From: Stephen M. Cameron <scameron@...rdog.cce.hp.com> 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@...rdog.cce.hp.com> --- drivers/block/cciss.c | 8 +++----- 1 files changed, 3 insertions(+), 5 deletions(-) diff --git a/drivers/block/cciss.c b/drivers/block/cciss.c index adc517c..c0d794c 100644 --- a/drivers/block/cciss.c +++ b/drivers/block/cciss.c @@ -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 */ -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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