linux-kernel - Re: [PATCH v2 04/15] DMA: shdma: make a pointer const

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Date:	Sun, 21 Jul 2013 23:54:22 +0200
From:	Laurent Pinchart <laurent.pinchart@...asonboard.com>
To:	Guennadi Liakhovetski <g.liakhovetski@....de>
Cc:	linux-kernel@...r.kernel.org, linux-sh@...r.kernel.org,
	Magnus Damm <magnus.damm@...il.com>,
	Simon Horman <horms@...ge.net.au>,
	Vinod Koul <vinod.koul@...el.com>,
	Sergei Shtylyov <sergei.shtylyov@...entembedded.com>,
	Guennadi Liakhovetski <g.liakhovetski+renesas@...il.com>
Subject: Re: [PATCH v2 04/15] DMA: shdma: make a pointer const

Hi Guennadi,

Thanks for the patch.

On Friday 19 July 2013 18:29:29 Guennadi Liakhovetski wrote:
> Platform data shouldn't be changed at run-time, so, pointers to it should
> be const.

If you move this patch to the beginning of the series you could make the pdata 
structures const in 02/15 and 03/15.

> Signed-off-by: Guennadi Liakhovetski <g.liakhovetski+renesas@...il.com>
> ---
>  drivers/dma/sh/shdma.h  |    2 +-
>  drivers/dma/sh/shdmac.c |   10 +++++-----
>  2 files changed, 6 insertions(+), 6 deletions(-)
> 
> diff --git a/drivers/dma/sh/shdma.h b/drivers/dma/sh/shdma.h
> index 82a83f8..ae0c65f 100644
> --- a/drivers/dma/sh/shdma.h
> +++ b/drivers/dma/sh/shdma.h
> @@ -36,7 +36,7 @@ struct sh_dmae_chan {
>  struct sh_dmae_device {
>  	struct shdma_dev shdma_dev;
>  	struct sh_dmae_chan *chan[SH_DMAE_MAX_CHANNELS];
> -	struct sh_dmae_pdata *pdata;
> +	const struct sh_dmae_pdata *pdata;
>  	struct list_head node;
>  	void __iomem *chan_reg;
>  	void __iomem *dmars;
> diff --git a/drivers/dma/sh/shdmac.c b/drivers/dma/sh/shdmac.c
> index 6546bf9..859ddbe 100644
> --- a/drivers/dma/sh/shdmac.c
> +++ b/drivers/dma/sh/shdmac.c
> @@ -177,7 +177,7 @@ static bool dmae_is_busy(struct sh_dmae_chan *sh_chan)
>  static unsigned int calc_xmit_shift(struct sh_dmae_chan *sh_chan, u32 chcr)
> {
>  	struct sh_dmae_device *shdev = to_sh_dev(sh_chan);
> -	struct sh_dmae_pdata *pdata = shdev->pdata;
> +	const struct sh_dmae_pdata *pdata = shdev->pdata;
>  	int cnt = ((chcr & pdata->ts_low_mask) >> pdata->ts_low_shift) |
>  		((chcr & pdata->ts_high_mask) >> pdata->ts_high_shift);
> 
> @@ -190,7 +190,7 @@ static unsigned int calc_xmit_shift(struct sh_dmae_chan
> *sh_chan, u32 chcr) static u32 log2size_to_chcr(struct sh_dmae_chan
> *sh_chan, int l2size) {
>  	struct sh_dmae_device *shdev = to_sh_dev(sh_chan);
> -	struct sh_dmae_pdata *pdata = shdev->pdata;
> +	const struct sh_dmae_pdata *pdata = shdev->pdata;
>  	int i;
> 
>  	for (i = 0; i < pdata->ts_shift_num; i++)
> @@ -250,7 +250,7 @@ static int dmae_set_chcr(struct sh_dmae_chan *sh_chan,
> u32 val) static int dmae_set_dmars(struct sh_dmae_chan *sh_chan, u16 val)
>  {
>  	struct sh_dmae_device *shdev = to_sh_dev(sh_chan);
> -	struct sh_dmae_pdata *pdata = shdev->pdata;
> +	const struct sh_dmae_pdata *pdata = shdev->pdata;
>  	const struct sh_dmae_channel *chan_pdata =
> &pdata->channel[sh_chan->shdma_chan.id]; void __iomem *addr = shdev->dmars;
>  	unsigned int shift = chan_pdata->dmars_bit;
> @@ -319,7 +319,7 @@ static const struct sh_dmae_slave_config
> *dmae_find_slave( struct sh_dmae_chan *sh_chan, int match)
>  {
>  	struct sh_dmae_device *shdev = to_sh_dev(sh_chan);
> -	struct sh_dmae_pdata *pdata = shdev->pdata;
> +	const struct sh_dmae_pdata *pdata = shdev->pdata;
>  	const struct sh_dmae_slave_config *cfg;
>  	int i;
> 
> @@ -665,7 +665,7 @@ static const struct shdma_ops sh_dmae_shdma_ops = {
> 
>  static int sh_dmae_probe(struct platform_device *pdev)
>  {
> -	struct sh_dmae_pdata *pdata;
> +	const struct sh_dmae_pdata *pdata;
>  	unsigned long irqflags = IRQF_DISABLED,
>  		chan_flag[SH_DMAE_MAX_CHANNELS] = {};
>  	int errirq, chan_irq[SH_DMAE_MAX_CHANNELS];
-- 
Regards,

Laurent Pinchart

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