linux-kernel - Re: [PATCH 1/3 v3] mfd: Add LPC driver for Intel ICH chipsets

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Date:	Fri, 17 Feb 2012 22:21:55 +0100
From:	Jean Delvare <khali@...ux-fr.org>
To:	Aaron Sierra <asierra@...-inc.com>
Cc:	Guenter Roeck <guenter@...ck-us.net>,
	Peter Tyser <ptyser@...-inc.com>,
	Grant Likely <grant.likely@...retlab.ca>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 1/3 v3] mfd: Add LPC driver for Intel ICH chipsets

Hi Aaron,

On Fri, 17 Feb 2012 12:18:18 -0600 (CST), Aaron Sierra wrote:
> This driver currently creates resources for use by a forthcoming ICH
> chipset GPIO driver. It could be expanded to created the resources for
> converting the esb2rom (mtd) and iTCO_wdt (wdt), and potentially more,
> drivers to use the mfd model.
> 
> Signed-off-by: Aaron Sierra <asierra@...-inc.com>
> Signed-off-by: Guenter Roeck <linux@...ck-us.net>

Tested-by: Jean Delvare <khali@...ux-fr.org>

> ---
>  drivers/mfd/Kconfig         |    9 +
>  drivers/mfd/Makefile        |    1 +
>  drivers/mfd/lpc_ich.c       |  513 +++++++++++++++++++++++++++++++++++++++++++
>  include/linux/mfd/lpc_ich.h |   32 +++
>  4 files changed, 555 insertions(+), 0 deletions(-)
>  create mode 100644 drivers/mfd/lpc_ich.c
>  create mode 100644 include/linux/mfd/lpc_ich.h

Looks alright this time, except:

> +static void __devexit lpc_ich_remove(struct pci_dev *dev)
> +{
> +	mfd_remove_devices(&dev->dev);
> +
> +	if (lpc_ich_gpio_save > 0)
> +		pci_write_config_byte(dev, GPIOCTRL, (u8)lpc_ich_gpio_save);
> +	if (lpc_ich_acpi_save > 0)
> +		pci_write_config_byte(dev, ACPICTRL, (u8)lpc_ich_acpi_save);

I think you really mean >= 0 above. And the casts aren't needed. You
should also reset lpc_ich_gpio_save and lpc_ich_acpi_save to -1 after
restoring the values, it matters if the device is removed and re-added
through sysfs.

This cleanup is missing from the error path in lpc_ich_probe, BTW. You
may want to move it to a separate function so that you can call it from
both lpc_ich_probe and lpc_ich_remove.

-- 
Jean Delvare
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