linux-kernel - Re: [PATCH v5 4/4] gpio: add support for the Diolan DLN-2 USB GPIO driver

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Date:	Sat, 20 Sep 2014 09:32:24 +0300
From:	Octavian Purdila <octavian.purdila@...el.com>
To:	Arnd Bergmann <arnd@...db.de>
Cc:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Linus Walleij <linus.walleij@...aro.org>,
	Alexandre Courbot <gnurou@...il.com>, wsa@...-dreams.de,
	Samuel Ortiz <sameo@...ux.intel.com>,
	Lee Jones <lee.jones@...aro.org>,
	Johan Hovold <johan@...nel.org>,
	Daniel Baluta <daniel.baluta@...el.com>,
	Laurentiu Palcu <laurentiu.palcu@...el.com>,
	linux-usb@...r.kernel.org, lkml <linux-kernel@...r.kernel.org>,
	"linux-gpio@...r.kernel.org" <linux-gpio@...r.kernel.org>,
	linux-i2c@...r.kernel.org
Subject: Re: [PATCH v5 4/4] gpio: add support for the Diolan DLN-2 USB GPIO driver

On Sat, Sep 20, 2014 at 5:48 AM, Arnd Bergmann <arnd@...db.de> wrote:
> On Friday 19 September 2014, Octavian Purdila wrote:
>> +struct dln2_gpio_pin {
>> +     __le16 pin;
>> +} __packed;
>
> This does not need to be marked packed, since it is never embedded in another
> structure.
>

Will do.

>> +struct dln2_gpio_pin_val {
>> +     __le16 pin;
>> +     u8 value;
>> +} __packed;
>
> It's enough here to mark just the 'pin' member as packed.
>

OK.

>> +static int dln2_gpio_get_pin_count(struct platform_device *pdev)
>> +{
>> +     int ret;
>> +     __le16 count;
>> +     int len = sizeof(count);
>> +
>> +     ret = dln2_transfer(pdev, DLN2_GPIO_GET_PIN_COUNT, NULL, 0, &count,
>> +                         &len);
>
> You must not do a USB transaction on stack memory.
>

dln2_transfer allocate a new buffer (in dln2_prep_buf(), with
kmalloc()) and does the USB transfer with that buffer.
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