Gitweb:
http://git.kernel.org/git/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commit;h=e4223976341ffb22fabe5b3a69873966808c83aa
Commit: e4223976341ffb22fabe5b3a69873966808c83aa
Parent: 97a1ad431b89765755d2b5aa8c0777ed637d5c4a
Author: Shannon Nelson <[EMAIL PROTECTED]>
AuthorDate: Fri Aug 24 23:02:53 2007 -0700
Committer: David S. Miller <[EMAIL PROTECTED]>
CommitDate: Sun Aug 26 18:35:40 2007 -0700
[IOAT]: ioatdma needs to to play nice in a multi-dma-client world
Now that the DMA engine has a multi-client interface, fix the ioatdma
driver to play along. At the same time, remove a couple of unnecessary
reads and writes.
Signed-off-by: Shannon Nelson <[EMAIL PROTECTED]>
Signed-off-by: David S. Miller <[EMAIL PROTECTED]>
---
drivers/dma/ioatdma.c | 18 ++++--------------
1 files changed, 4 insertions(+), 14 deletions(-)
diff --git a/drivers/dma/ioatdma.c b/drivers/dma/ioatdma.c
index 2d1f178..41b18c5 100644
--- a/drivers/dma/ioatdma.c
+++ b/drivers/dma/ioatdma.c
@@ -191,17 +191,12 @@ static int ioat_dma_alloc_chan_resources(struct dma_chan
*chan)
int i;
LIST_HEAD(tmp_list);
- /*
- * In-use bit automatically set by reading chanctrl
- * If 0, we got it, if 1, someone else did
- */
- chanctrl = readw(ioat_chan->reg_base + IOAT_CHANCTRL_OFFSET);
- if (chanctrl & IOAT_CHANCTRL_CHANNEL_IN_USE)
- return -EBUSY;
+ /* have we already been set up? */
+ if (!list_empty(&ioat_chan->free_desc))
+ return INITIAL_IOAT_DESC_COUNT;
/* Setup register to interrupt and write completion status on error */
- chanctrl = IOAT_CHANCTRL_CHANNEL_IN_USE |
- IOAT_CHANCTRL_ERR_INT_EN |
+ chanctrl = IOAT_CHANCTRL_ERR_INT_EN |
IOAT_CHANCTRL_ANY_ERR_ABORT_EN |
IOAT_CHANCTRL_ERR_COMPLETION_EN;
writew(chanctrl, ioat_chan->reg_base + IOAT_CHANCTRL_OFFSET);
@@ -282,11 +277,6 @@ static void ioat_dma_free_chan_resources(struct dma_chan
*chan)
in_use_descs - 1);
ioat_chan->last_completion = ioat_chan->completion_addr = 0;
-
- /* Tell hw the chan is free */
- chanctrl = readw(ioat_chan->reg_base + IOAT_CHANCTRL_OFFSET);
- chanctrl &= ~IOAT_CHANCTRL_CHANNEL_IN_USE;
- writew(chanctrl, ioat_chan->reg_base + IOAT_CHANCTRL_OFFSET);
}
static struct dma_async_tx_descriptor *
-
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