linux-kernel - Re: [PATCH 3/3] mtd: sh_flctl: remove unused variable and assignment

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Date:	Sat, 02 May 2015 02:07:37 +0300
From:	Laurent Pinchart <laurent.pinchart@...asonboard.com>
To:	Nicholas Mc Guire <hofrat@...dl.org>
Cc:	David Woodhouse <dwmw2@...radead.org>,
	Brian Norris <computersforpeace@...il.com>,
	Vinod Koul <vinod.koul@...el.com>,
	Laurent Pinchart <laurent.pinchart+renesas@...asonboard.com>,
	Kuninori Morimoto <kuninori.morimoto.gx@...esas.com>,
	Wolfram Sang <wsa@...-dreams.de>,
	Arnd Bergmann <arnd@...db.de>, linux-mtd@...ts.infradead.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 3/3] mtd: sh_flctl: remove unused variable and assignment

Hi Nicholas,

Thank you for the patch.

On Friday 01 May 2015 16:16:03 Nicholas Mc Guire wrote:
> Fixes a compile warning [-Wunused-but-set-variable] only.
> 
> Signed-off-by: Nicholas Mc Guire <hofrat@...dl.org>
> ---
> 
> This fixes the compile time warning:
> drivers/mtd/nand/sh_flctl.c: In function 'flctl_dma_fifo0_transfer':
> drivers/mtd/nand/sh_flctl.c:354:15: warning: variable 'cookie' set but not
> used [-Wunused-but-set-variable]
> 
> as dmaengine_submit only reads and returns desc->tx_submit(desc) which
> is then unused in flctl_dma_fifo0_transfer, this should be side-effect
> free to remove.

You can ignore its return value, but you can't remove the call to 
dmaengine_submit, as it's part of the DMA engine API and desc->tx_submit() 
does important work.

> Patch was compile tested with ap325rxa_defconfig (implies
> CONFIG_MTD_NAND_SH_FLCTL=y)
> 
> Patch is against 4.1-rc1 (localversion-next is -next-20150501)
> 
>  drivers/mtd/nand/sh_flctl.c |    2 --
>  1 file changed, 2 deletions(-)
> 
> diff --git a/drivers/mtd/nand/sh_flctl.c b/drivers/mtd/nand/sh_flctl.c
> index b9f265a..6a5c4f7 100644
> --- a/drivers/mtd/nand/sh_flctl.c
> +++ b/drivers/mtd/nand/sh_flctl.c
> @@ -351,7 +351,6 @@ static int flctl_dma_fifo0_transfer(struct sh_flctl
> *flctl, unsigned long *buf, struct dma_chan *chan;
>  	enum dma_transfer_direction tr_dir;
>  	dma_addr_t dma_addr;
> -	dma_cookie_t cookie = -EINVAL;
>  	uint32_t reg;
>  	int ret;
>  	unsigned long time_left;
> @@ -377,7 +376,6 @@ static int flctl_dma_fifo0_transfer(struct sh_flctl
> *flctl, unsigned long *buf,
> 
>  		desc->callback = flctl_dma_complete;
>  		desc->callback_param = flctl;
> -		cookie = dmaengine_submit(desc);
> 
>  		dma_async_issue_pending(chan);
>  	} else {

-- 
Regards,

Laurent Pinchart

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