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Tue, 03 Nov 2026 10:49:00 -0800 (PST) Received: from localhost ([2a03:2880:2ff:49::]) by smtp.gmail.com with ESMTPSA id 98e67ed59e1d1-3b0944bd88bsm210133a91.12.2026.11.03.10.48.59 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 03 Nov 2026 10:49:00 -0800 (PST) Date: Tue, 3 Nov 2026 10:48:59 -0800 From: Joe Damato To: Frank Li Cc: Andrew Lunn , "David S. Miller" , Eric Dumazet , Jakub Kicinski , Paolo Abeni , Chen-Yu Tsai , Jernej Skrabec , Samuel Holland , Radhey Shyam Pandey , Michal Simek , Stephan Gerhold , Loic Poulain , Sergey Ryazanov , Johannes Berg , Frank Li , Andre Przywara , Li Youhong , Arnd Bergmann , bui duc phuc , Yicong Hui , Simon Horman , "open list:NETWORKING DRIVERS" , "moderated list:ARM/Allwinner sunXi SoC support" , "open list:ARM/Allwinner sunXi SoC support" , open list , "open list:ARM/QUALCOMM MAILING LIST" , imx@lists.linux.dev, vkoul@kernel.org Subject: Re: [PATCH] net: dma: use dmaengine_desc_set_callback() Message-ID: Mail-Followup-To: Joe Damato , Frank Li , Andrew Lunn , "David S. Miller" , Eric Dumazet , Jakub Kicinski , Paolo Abeni , Chen-Yu Tsai , Jernej Skrabec , Samuel Holland , Radhey Shyam Pandey , Michal Simek , Stephan Gerhold , Loic Poulain , Sergey Ryazanov , Johannes Berg , Frank Li , Andre Przywara , Li Youhong , Arnd Bergmann , bui duc phuc , Yicong Hui , Simon Horman , "open list:NETWORKING DRIVERS" , "moderated list:ARM/Allwinner sunXi SoC support" , "open list:ARM/Allwinner sunXi SoC support" , open list , "open list:ARM/QUALCOMM MAILING LIST" , imx@lists.linux.dev, vkoul@kernel.org References: <20261102191922.4044912-1-Frank.Li@oss.nxp.com> X-Mailing-List: netdev@vger.kernel.org List-Id: List-Post: List-Help: List-Subscribe: List-Unsubscribe: List-Owner: Precedence: list MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: On Tue, Nov 03, 2026 at 09:06:03AM -0600, Frank Li wrote: > On Mon, Nov 02, 2026 at 03:28:33PM -0800, Joe Damato wrote: > > On Mon, Nov 02, 2026 at 02:19:16PM -0500, Frank.Li@oss.nxp.com wrote: > > > From: Frank Li > > > > > > Replace open-coded assignments to callback and callback_param fields > > > of struct dma_async_tx_descriptor with calls to the > > > dmaengine_desc_set_callback() helper across net drivers. > > > > > > No functional change intended. Prepare to make struct > > > dma_async_tx_descriptor private to the DMA engine. > > > > > > Signed-off-by: Frank Li > > > --- > > > drivers/net/ethernet/allwinner/sun4i-emac.c | 3 +-- > > > drivers/net/ethernet/micrel/ks8842.c | 6 ++---- > > > drivers/net/ethernet/xilinx/xilinx_axienet_main.c | 6 ++---- > > > drivers/net/wwan/qcom_bam_dmux.c | 10 ++++------ > > > 4 files changed, 9 insertions(+), 16 deletions(-) > > > > [...] > > > > > diff --git a/drivers/net/wwan/qcom_bam_dmux.c b/drivers/net/wwan/qcom_bam_dmux.c > > > index cc6ace8d64371..1479f8362e04e 100644 > > > --- a/drivers/net/wwan/qcom_bam_dmux.c > > > +++ b/drivers/net/wwan/qcom_bam_dmux.c > > > @@ -195,9 +195,8 @@ static bool bam_dmux_skb_dma_submit_tx(struct bam_dmux_skb_dma *skb_dma) > > > return false; > > > } > > > > > > - desc->callback = bam_dmux_tx_callback; > > > - desc->callback_param = skb_dma; > > > - desc->cookie = dmaengine_submit(desc); > > > + dmaengine_desc_set_callback(desc, bam_dmux_tx_callback, NULL, skb_dma); > > > + dmaengine_submit(desc); > > > return true; > > > } > > > > > > @@ -477,9 +476,8 @@ static bool bam_dmux_skb_dma_submit_rx(struct bam_dmux_skb_dma *skb_dma) > > > return false; > > > } > > > > > > - desc->callback = bam_dmux_rx_callback; > > > - desc->callback_param = skb_dma; > > > - desc->cookie = dmaengine_submit(desc); > > > + dmaengine_desc_set_callback(desc, bam_dmux_rx_callback, NULL, skb_dma); > > > + dmaengine_submit(desc); > > > > I noticed in the above that the return value of dmaengine_submit is discarded > > instead of stored. > > > > Is that intentional? I suppose it might be because AFAICT cookie is never > > used and the commit message says "no functional change intended". > > dma_cookie_assign() already set desc->cookie in dmaengine_submit(). Of couse > it is not obvious. Do you need me update commit message to descript it. Ah, I see it now. In the tx_submit callback it looks like dma drivers set the cookie. So removing it here really is a no-op since it was getting set, as you said, during submit. My mistake. I don't think it's worth respinning just to fix the commit message just because I didn't dig deep enough :)