linux-kernel - Re: [RFC patch] DMA engine/Langwell: release LLI pool

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Date:	Mon, 08 Aug 2011 22:54:09 +0530
From:	"Koul, Vinod" <vinod.koul@...el.com>
To:	Hillf Danton <dhillf@...il.com>
Cc:	LKML <linux-kernel@...r.kernel.org>,
	Steven Rostedt <rostedt@...dmis.org>
Subject: Re: [RFC patch] DMA engine/Langwell: release LLI pool

On Wed, 2011-07-27 at 21:24 +0800, Hillf Danton wrote:
> When releasing resources allocated before for DMA channel, checking LLI pool is
> added and it is reclaimed if still available.
> 
> Signed-off-by: Hillf Danton <dhillf@...il.com>
> ---
>  drivers/dma/intel_mid_dma.c |    8 ++++++++
>  1 files changed, 8 insertions(+), 0 deletions(-)
> 
> diff --git a/drivers/dma/intel_mid_dma.c b/drivers/dma/intel_mid_dma.c
> index f653517..4c758fc 100644
> --- a/drivers/dma/intel_mid_dma.c
> +++ b/drivers/dma/intel_mid_dma.c
> @@ -833,6 +833,10 @@ static void
> intel_mid_dma_free_chan_resources(struct dma_chan *chan)
And this one, as well
>  	midc->descs_allocated = 0;
>  	list_for_each_entry_safe(desc, _desc, &midc->active_list, desc_node) {
>  		list_del(&desc->desc_node);
> +		if (desc->lli != NULL) {
> +			pci_pool_free(desc->lli_pool, desc->lli, desc->lli_phys);
> +			pci_pool_destroy(desc->lli_pool);
> +		}
>  		pci_pool_free(mid->dma_pool, desc, desc->txd.phys);
>  	}
>  	list_for_each_entry_safe(desc, _desc, &midc->free_list, desc_node) {
> @@ -841,6 +845,10 @@ static void
> intel_mid_dma_free_chan_resources(struct dma_chan *chan)
>  	}
>  	list_for_each_entry_safe(desc, _desc, &midc->queue, desc_node) {
>  		list_del(&desc->desc_node);
> +		if (desc->lli != NULL) {
> +			pci_pool_free(desc->lli_pool, desc->lli, desc->lli_phys);
> +			pci_pool_destroy(desc->lli_pool);
> +		}
>  		pci_pool_free(mid->dma_pool, desc, desc->txd.phys);
>  	}
>  	spin_unlock_bh(&midc->lock);
> --
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-- 
~Vinod

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