On Sat, Sep 20, 2014 at 5:48 AM, Arnd Bergmann <arnd@xxxxxxxx> 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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