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authorDan Williams <dan.j.williams@intel.com>2009-02-18 22:48:26 (GMT)
committerLinus Torvalds <torvalds@linux-foundation.org>2009-02-18 23:37:55 (GMT)
commit287d859222e0adbc67666a6154aaf42d7d5bbb54 (patch)
treea3e00f7b42f91c0d00f9d5a8d79414939b3c566f /drivers/dma
parent9ccf3b5e8409927835c4d38cb2f380c9e4349e76 (diff)
downloadlinux-287d859222e0adbc67666a6154aaf42d7d5bbb54.tar.xz
atmel-mci: fix initialization of dma slave data
The conversion of atmel-mci to dma_request_channel missed the initialization of the channel dma_slave information. The filter_fn passed to dma_request_channel is responsible for initializing the channel's private data. This implementation has the additional benefit of enabling a generic client-channel data passing mechanism. Reviewed-by: Atsushi Nemoto <anemo@mba.ocn.ne.jp> Signed-off-by: Dan Williams <dan.j.williams@intel.com> Acked-by: Haavard Skinnemoen <hskinnemoen@atmel.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'drivers/dma')
-rw-r--r--drivers/dma/dmaengine.c2
-rw-r--r--drivers/dma/dw_dmac.c5
-rw-r--r--drivers/dma/dw_dmac_regs.h2
3 files changed, 4 insertions, 5 deletions
diff --git a/drivers/dma/dmaengine.c b/drivers/dma/dmaengine.c
index a589930..280a9d2 100644
--- a/drivers/dma/dmaengine.c
+++ b/drivers/dma/dmaengine.c
@@ -518,6 +518,7 @@ struct dma_chan *__dma_request_channel(dma_cap_mask_t *mask, dma_filter_fn fn, v
dma_chan_name(chan), err);
else
break;
+ chan->private = NULL;
chan = NULL;
}
}
@@ -536,6 +537,7 @@ void dma_release_channel(struct dma_chan *chan)
WARN_ONCE(chan->client_count != 1,
"chan reference count %d != 1\n", chan->client_count);
dma_chan_put(chan);
+ chan->private = NULL;
mutex_unlock(&dma_list_mutex);
}
EXPORT_SYMBOL_GPL(dma_release_channel);
diff --git a/drivers/dma/dw_dmac.c b/drivers/dma/dw_dmac.c
index 6b702cc..a97c07e 100644
--- a/drivers/dma/dw_dmac.c
+++ b/drivers/dma/dw_dmac.c
@@ -560,7 +560,7 @@ dwc_prep_slave_sg(struct dma_chan *chan, struct scatterlist *sgl,
unsigned long flags)
{
struct dw_dma_chan *dwc = to_dw_dma_chan(chan);
- struct dw_dma_slave *dws = dwc->dws;
+ struct dw_dma_slave *dws = chan->private;
struct dw_desc *prev;
struct dw_desc *first;
u32 ctllo;
@@ -790,7 +790,7 @@ static int dwc_alloc_chan_resources(struct dma_chan *chan)
cfghi = DWC_CFGH_FIFO_MODE;
cfglo = 0;
- dws = dwc->dws;
+ dws = chan->private;
if (dws) {
/*
* We need controller-specific data to set up slave
@@ -866,7 +866,6 @@ static void dwc_free_chan_resources(struct dma_chan *chan)
spin_lock_bh(&dwc->lock);
list_splice_init(&dwc->free_list, &list);
dwc->descs_allocated = 0;
- dwc->dws = NULL;
/* Disable interrupts */
channel_clear_bit(dw, MASK.XFER, dwc->mask);
diff --git a/drivers/dma/dw_dmac_regs.h b/drivers/dma/dw_dmac_regs.h
index 00fdd18..b252b20 100644
--- a/drivers/dma/dw_dmac_regs.h
+++ b/drivers/dma/dw_dmac_regs.h
@@ -139,8 +139,6 @@ struct dw_dma_chan {
struct list_head queue;
struct list_head free_list;
- struct dw_dma_slave *dws;
-
unsigned int descs_allocated;
};