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dw_dmac: introduce to_dw_desc() macro 

The to_dw_desc() macro helps to retrieve the dw_desc node from the
corresponding list_head structure.

Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Acked-by: Viresh Kumar <viresh.kumar@linaro.org>
Reviewed-by: Felipe Balbi <balbi@ti.com>
Signed-off-by: Vinod Koul <vinod.koul@linux.intel.com>
This commit is contained in:
Andy Shevchenko 2012-10-18 17:34:12 +03:00 committed by Vinod Koul
parent ba84bd7146
commit e63a47a361
2 changed files with 4 additions and 4 deletions
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6
drivers/dma/dw_dmac.c
View File

@ -93,7 +93,7 @@ static struct device *chan2parent(struct dma_chan *chan)
static struct dw_desc *dwc_first_active(struct dw_dma_chan *dwc) static struct dw_desc *dwc_first_active(struct dw_dma_chan *dwc)
{ {
return list_entry(dwc->active_list.next, struct dw_desc, desc_node); return to_dw_desc(dwc->active_list.next);
} }
static struct dw_desc *dwc_desc_get(struct dw_dma_chan *dwc) static struct dw_desc *dwc_desc_get(struct dw_dma_chan *dwc)
@ -600,9 +600,7 @@ static void dw_dma_tasklet(unsigned long data)
if (test_bit(DW_DMA_IS_SOFT_LLP, &dwc->flags)) { if (test_bit(DW_DMA_IS_SOFT_LLP, &dwc->flags)) {
if (dwc->tx_node_active != dwc->tx_list) { if (dwc->tx_node_active != dwc->tx_list) {
struct dw_desc *desc = struct dw_desc *desc =
list_entry(dwc->tx_node_active, to_dw_desc(dwc->tx_node_active);
struct dw_desc,
desc_node);
dma_writel(dw, CLEAR.XFER, dwc->mask); dma_writel(dw, CLEAR.XFER, dwc->mask);

2
drivers/dma/dw_dmac_regs.h
View File

@ -299,6 +299,8 @@ struct dw_desc {
size_t len; size_t len;
}; };
#define to_dw_desc(h) list_entry(h, struct dw_desc, desc_node)
static inline struct dw_desc * static inline struct dw_desc *
txd_to_dw_desc(struct dma_async_tx_descriptor *txd) txd_to_dw_desc(struct dma_async_tx_descriptor *txd)
{ {