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| author | Chanho Park <chanho61.park@samsung.com> | 2013-08-09 20:11:33 +0900 |
|---|---|---|
| committer | Chanho Park <chanho61.park@samsung.com> | 2014-11-18 11:44:46 +0900 |
| commit | d5640eace2e4128790ba1376aeea47fb4721c768 (patch) | |
| tree | 82f1fed27c505df129e5a90ede6c9e71c2764d5b /drivers/dma | |
| parent | a3d8259beec61d6308e307b8359b142bd9f846cb (diff) | |
| download | linux-3.10-d5640eace2e4128790ba1376aeea47fb4721c768.tar.gz linux-3.10-d5640eace2e4128790ba1376aeea47fb4721c768.tar.bz2 linux-3.10-d5640eace2e4128790ba1376aeea47fb4721c768.zip | |
dma: pl330: split off common code to give back descriptors
This patch adds __pl330_giveback_descs which give back descriptors when fails
allocating descriptors. It requires to eliminate duplication for
pl330_prep_dma_sg which will be added later.
Signed-off-by: Chanho Park <chanho61.park@samsung.com>
Acked-by : Jassi Brar <jassisinghbrar@gmail.com>
Signed-off-by: Kyungmin Park <kyungmin.park@samsung.com>
Signed-off-by: Vinod Koul <vinod.koul@intel.com>
Diffstat (limited to 'drivers/dma')
| -rw-r--r-- | drivers/dma/pl330.c | 38 |
1 files changed, 23 insertions, 15 deletions
diff --git a/drivers/dma/pl330.c b/drivers/dma/pl330.c index 4ad13eb8b66..ebc2af92e5d 100644 --- a/drivers/dma/pl330.c +++ b/drivers/dma/pl330.c @@ -2814,6 +2814,28 @@ pl330_prep_dma_memcpy(struct dma_chan *chan, dma_addr_t dst, return &desc->txd; } +static void __pl330_giveback_desc(struct dma_pl330_dmac *pdmac, + struct dma_pl330_desc *first) +{ + unsigned long flags; + struct dma_pl330_desc *desc; + + if (!first) + return; + + spin_lock_irqsave(&pdmac->pool_lock, flags); + + while (!list_empty(&first->node)) { + desc = list_entry(first->node.next, + struct dma_pl330_desc, node); + list_move_tail(&desc->node, &pdmac->desc_pool); + } + + list_move_tail(&first->node, &pdmac->desc_pool); + + spin_unlock_irqrestore(&pdmac->pool_lock, flags); +} + static struct dma_async_tx_descriptor * pl330_prep_slave_sg(struct dma_chan *chan, struct scatterlist *sgl, unsigned int sg_len, enum dma_transfer_direction direction, @@ -2822,7 +2844,6 @@ pl330_prep_slave_sg(struct dma_chan *chan, struct scatterlist *sgl, struct dma_pl330_desc *first, *desc = NULL; struct dma_pl330_chan *pch = to_pchan(chan); struct scatterlist *sg; - unsigned long flags; int i; dma_addr_t addr; @@ -2842,20 +2863,7 @@ pl330_prep_slave_sg(struct dma_chan *chan, struct scatterlist *sgl, dev_err(pch->dmac->pif.dev, "%s:%d Unable to fetch desc\n", __func__, __LINE__); - if (!first) - return NULL; - - spin_lock_irqsave(&pdmac->pool_lock, flags); - - while (!list_empty(&first->node)) { - desc = list_entry(first->node.next, - struct dma_pl330_desc, node); - list_move_tail(&desc->node, &pdmac->desc_pool); - } - - list_move_tail(&first->node, &pdmac->desc_pool); - - spin_unlock_irqrestore(&pdmac->pool_lock, flags); + __pl330_giveback_desc(pdmac, first); return NULL; } |