Re: [PATCH 4/8 resend] dw_dmac: calling dwc_scan_descriptors fromdwc_tx_status() after taking lock

[viresh kumar]

On 03/02/2011 11:43 PM, Koul, Vinod wrote:
> On Mon, 2011-02-28 at 16:11 +0530, Viresh Kumar wrote:
>> Signed-off-by: Viresh Kumar <viresh.kumar@xxxxxx>
>> ---
>>  drivers/dma/dw_dmac.c |    2 ++
>>  1 files changed, 2 insertions(+), 0 deletions(-)
>>
>> diff --git a/drivers/dma/dw_dmac.c b/drivers/dma/dw_dmac.c
>> index 3bf4772..5cc5abf 100644
>> --- a/drivers/dma/dw_dmac.c
>> +++ b/drivers/dma/dw_dmac.c
>> @@ -830,7 +830,9 @@ dwc_tx_status(struct dma_chan *chan,
>>  
>>  	ret = dma_async_is_complete(cookie, last_complete, last_used);
>>  	if (ret != DMA_SUCCESS) {
>> +		spin_lock_bh(&dwc->lock);
>>  		dwc_scan_descriptors(to_dw_dma(chan->device), dwc);
>> +		spin_unlock_bh(&dwc->lock);
>>  
>>  		last_complete = dwc->completed;
>>  		last_used = chan->cookie;
> 
> Please always add a short description in the patch, helps in long run
> 

Sure.

> Shouldnt you be doing this for dwc_handle_error() as well? I see thats
> called without taking the lock....
> 

dwc_handle_error is called from dw_dma_tasklet with lock held. So its not
required there.

-- 
viresh
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