linux-kernel - Re: [PATCH 1/1] mfd: intel_quark_i2c

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Message-ID: <20150326082954.GD5951@x1>
Date:	Thu, 26 Mar 2015 08:29:54 +0000
From:	Lee Jones <lee.jones@...aro.org>
To:	Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
Cc:	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/1] mfd: intel_quark_i2c_gpio: don't crash if !DMI

On Wed, 25 Mar 2015, Andy Shevchenko wrote:

> dmi_get_system_info() may return NULL either when CONFIG_DMI is not set or when
> board has an old firmware. The patch prevents a crash and changes the default
> frequency to be in align with older board.
> 
> Signed-off-by: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
> ---
>  drivers/mfd/intel_quark_i2c_gpio.c | 23 +++++++++++++++--------
>  1 file changed, 15 insertions(+), 8 deletions(-)
> 
> diff --git a/drivers/mfd/intel_quark_i2c_gpio.c b/drivers/mfd/intel_quark_i2c_gpio.c
> index 006f2a1..35291c2 100644
> --- a/drivers/mfd/intel_quark_i2c_gpio.c
> +++ b/drivers/mfd/intel_quark_i2c_gpio.c
> @@ -70,6 +70,9 @@ static const struct i2c_mode_info platform_i2c_mode_info[] = {
>  		.name = "GalileoGen2",
>  		.i2c_scl_freq = 400000,
>  	},
> +	{
> +		/* Sentinel */
> +	}
>  };

There's no need for this overt NULL entry.

I'll apply the patch and change this.

Applied, thanks.

>  static struct resource intel_quark_i2c_res[] = {
> @@ -153,10 +156,10 @@ static void intel_quark_unregister_i2c_clk(struct pci_dev *pdev)
>  static int intel_quark_i2c_setup(struct pci_dev *pdev, struct mfd_cell *cell)
>  {
>  	const char *board_name = dmi_get_system_info(DMI_BOARD_NAME);
> +	const struct i2c_mode_info *info;
>  	struct dw_i2c_platform_data *pdata;
>  	struct resource *res = (struct resource *)cell->resources;
>  	struct device *dev = &pdev->dev;
> -	unsigned int i;
>  
>  	res[INTEL_QUARK_IORES_MEM].start =
>  		pci_resource_start(pdev, MFD_I2C_BAR);
> @@ -170,13 +173,17 @@ static int intel_quark_i2c_setup(struct pci_dev *pdev, struct mfd_cell *cell)
>  	if (!pdata)
>  		return -ENOMEM;
>  
> -	/* Fast mode by default */
> -	pdata->i2c_scl_freq = 400000;
> -
> -	for (i = 0; i < ARRAY_SIZE(platform_i2c_mode_info); i++)
> -		if (!strcmp(board_name, platform_i2c_mode_info[i].name))
> -			pdata->i2c_scl_freq
> -				= platform_i2c_mode_info[i].i2c_scl_freq;
> +	/* Normal mode by default */
> +	pdata->i2c_scl_freq = 100000;
> +
> +	if (board_name) {
> +		for (info = platform_i2c_mode_info; info->name; info++) {
> +			if (!strcmp(board_name, info->name)) {
> +				pdata->i2c_scl_freq = info->i2c_scl_freq;
> +				break;
> +			}
> +		}
> +	}
>  
>  	cell->platform_data = pdata;
>  	cell->pdata_size = sizeof(*pdata);

-- 
Lee Jones
Linaro STMicroelectronics Landing Team Lead
Linaro.org │ Open source software for ARM SoCs
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