From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mga03.intel.com (mga03.intel.com [143.182.124.21]) by ozlabs.org (Postfix) with ESMTP id ACBDE140087 for ; Thu, 10 Apr 2014 21:39:37 +1000 (EST) Message-ID: <1397129361.11914.96.camel@smile.fi.intel.com> Subject: Re: [PATCH v3 4/8] DMA: Freescale: add fsl_dma_free_descriptor() to reduce code duplication From: Andy Shevchenko To: hongbo.zhang@freescale.com Date: Thu, 10 Apr 2014 14:29:21 +0300 In-Reply-To: <1397113805-24171-5-git-send-email-hongbo.zhang@freescale.com> References: <1397113805-24171-1-git-send-email-hongbo.zhang@freescale.com> <1397113805-24171-5-git-send-email-hongbo.zhang@freescale.com> Content-Type: text/plain; charset="UTF-8" Mime-Version: 1.0 Cc: leo.li@freescale.com, vkoul@infradead.org, linux-kernel@vger.kernel.org, scottwood@freescale.com, dmaengine@vger.kernel.org, dan.j.williams@intel.com, linuxppc-dev@lists.ozlabs.org List-Id: Linux on PowerPC Developers Mail List List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , On Thu, 2014-04-10 at 15:10 +0800, hongbo.zhang@freescale.com wrote: > From: Hongbo Zhang > > 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 > Signed-off-by: Qiang Liu > --- > 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? > } > > /** -- Andy Shevchenko Intel Finland Oy