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SubjectRe: [PATCH v3 4/8] DMA: Freescale: add fsl_dma_free_descriptor() to reduce code duplication

On 04/10/2014 07:29 PM, Andy Shevchenko wrote:
> On Thu, 2014-04-10 at 15:10 +0800, hongbo.zhang@freescale.com wrote:
>> From: Hongbo Zhang <hongbo.zhang@freescale.com>
>>
>> There are several places where descriptors are freed using identical code.
>> This patch puts this code into a function to reduce code duplication.
>>
>> Signed-off-by: Hongbo Zhang <hongbo.zhang@freescale.com>
>> Signed-off-by: Qiang Liu <qiang.liu@freescale.com>
>> ---
>> drivers/dma/fsldma.c | 30 ++++++++++++++++++------------
>> 1 file changed, 18 insertions(+), 12 deletions(-)
>>
>> diff --git a/drivers/dma/fsldma.c b/drivers/dma/fsldma.c
>> index b71cc04..b5a0ffa 100644
>> --- a/drivers/dma/fsldma.c
>> +++ b/drivers/dma/fsldma.c
>> @@ -418,6 +418,19 @@ static dma_cookie_t fsl_dma_tx_submit(struct dma_async_tx_descriptor *tx)
>> }
>>
>> /**
>> + * fsl_dma_free_descriptor - Free descriptor from channel's DMA pool.
>> + * @chan : Freescale DMA channel
>> + * @desc: descriptor to be freed
>> + */
>> +static void fsl_dma_free_descriptor(struct fsldma_chan *chan,
>> + struct fsl_desc_sw *desc)
>> +{
>> + list_del(&desc->node);
>> + chan_dbg(chan, "LD %p free\n", desc);
>> + dma_pool_free(chan->desc_pool, desc, desc->async_tx.phys);
>> +}
>> +
>> +/**
>> * fsl_dma_alloc_descriptor - Allocate descriptor from channel's DMA pool.
>> * @chan : Freescale DMA channel
>> *
>> @@ -489,11 +502,8 @@ static void fsldma_free_desc_list(struct fsldma_chan *chan,
>> {
>> struct fsl_desc_sw *desc, *_desc;
>>
>> - list_for_each_entry_safe(desc, _desc, list, node) {
>> - list_del(&desc->node);
>> - chan_dbg(chan, "LD %p free\n", desc);
>> - dma_pool_free(chan->desc_pool, desc, desc->async_tx.phys);
>> - }
>> + list_for_each_entry_safe(desc, _desc, list, node)
>> + fsl_dma_free_descriptor(chan, desc);
>> }
>>
>> static void fsldma_free_desc_list_reverse(struct fsldma_chan *chan,
>> @@ -501,11 +511,8 @@ static void fsldma_free_desc_list_reverse(struct fsldma_chan *chan,
>> {
>> struct fsl_desc_sw *desc, *_desc;
>>
>> - list_for_each_entry_safe_reverse(desc, _desc, list, node) {
>> - list_del(&desc->node);
>> - chan_dbg(chan, "LD %p free\n", desc);
>> - dma_pool_free(chan->desc_pool, desc, desc->async_tx.phys);
>> - }
>> + list_for_each_entry_safe_reverse(desc, _desc, list, node)
>> + fsl_dma_free_descriptor(chan, desc);
>> }
>>
>> /**
>> @@ -819,8 +826,7 @@ static void fsldma_cleanup_descriptor(struct fsldma_chan *chan,
>> dma_run_dependencies(txd);
>>
>> dma_descriptor_unmap(txd);
>> - chan_dbg(chan, "LD %p free\n", desc);
>> - dma_pool_free(chan->desc_pool, desc, txd->phys);
>> + fsl_dma_free_descriptor(chan, desc);
> Here is no list_del() call since it's been called in dma_do_tasklet().
> What will be the result of double list_del() against the same node?

Not clear with your point.
This patch is only introducing a common fsl_dma_free_descriptor() to
reduce code duplication. And later in the patch 6/8 the
fsldma_cleanup_descriptor() is replaced by fsldma_cleanup_descriptorS().

>> }
>>
>> /**
>





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