linux-kernel - Re: [PATCH 2/4] mfd: cs5535-mfd: Remove mfd

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Message-ID: <20191018165430.abyhbdodrjurx6g7@holly.lan>
Date:   Fri, 18 Oct 2019 17:54:30 +0100
From:   Daniel Thompson <daniel.thompson@...aro.org>
To:     Lee Jones <lee.jones@...aro.org>
Cc:     broonie@...nel.org, linus.walleij@...aro.org, arnd@...db.de,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        dilinger@...ued.net
Subject: Re: [PATCH 2/4] mfd: cs5535-mfd: Remove mfd_cell->id hack

On Fri, Oct 18, 2019 at 01:56:06PM +0100, Lee Jones wrote:
> The current implementation abuses the platform 'id' mfd_cell member
> to index into the correct resources entry.  If we place all cells
> into their numbered slots, we can cycle through all the cell entries
> and only process the populated ones which avoids this behaviour.
> 
> Signed-off-by: Lee Jones <lee.jones@...aro.org>
> ---
>  drivers/mfd/cs5535-mfd.c | 31 +++++++++++++------------------
>  1 file changed, 13 insertions(+), 18 deletions(-)
> 
> diff --git a/drivers/mfd/cs5535-mfd.c b/drivers/mfd/cs5535-mfd.c
> index 2c47afc22d24..b01e5bb4ed03 100644
> --- a/drivers/mfd/cs5535-mfd.c
> +++ b/drivers/mfd/cs5535-mfd.c
> @@ -115,16 +110,16 @@ static int cs5535_mfd_probe(struct pci_dev *pdev,
>  		return err;
>  
>  	/* fill in IO range for each cell; subdrivers handle the region */
> -	for (i = 0; i < ARRAY_SIZE(cs5535_mfd_cells); i++) {
> -		int bar = cs5535_mfd_cells[i].id;
> -		struct resource *r = &cs5535_mfd_resources[bar];
> +	for (i = 0; i < NR_BARS; i++) {
> +		struct mfd_cell *cell = &cs5535_mfd_cells[i];
> +		struct resource *r = &cs5535_mfd_resources[i];
>  
> -		r->flags = IORESOURCE_IO;
> -		r->start = pci_resource_start(pdev, bar);
> -		r->end = pci_resource_end(pdev, bar);
> +		if (!cell)
> +			continue;

cell will never be null. Should this be cell->num_resources instead?


Daniel.