linux-kernel - Re: [PATCH 1/2 v3] serial: mctrl_gpio: Check if GPIO property exisits before requesting it

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Date:   Wed, 29 May 2019 15:57:31 +0200
From:   Stefan Roese <sr@...x.de>
To:     Johan Hovold <johan@...nel.org>
Cc:     linux-serial@...r.kernel.org, linux-kernel@...r.kernel.org,
        Mika Westerberg <mika.westerberg@...ux.intel.com>,
        Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
        Yegor Yefremov <yegorslists@...glemail.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Giulio Benetti <giulio.benetti@...ronovasrl.com>
Subject: Re: [PATCH 1/2 v3] serial: mctrl_gpio: Check if GPIO property exisits
 before requesting it

On 29.05.19 15:44, Johan Hovold wrote:
> On Mon, May 27, 2019 at 01:18:04PM +0200, Stefan Roese wrote:
>> This patch adds a check for the GPIOs property existence, before the
>> GPIO is requested. This fixes an issue seen when the 8250 mctrl_gpio
>> support is added (2nd patch in this patch series) on x86 platforms using
>> ACPI.
> 
>> Signed-off-by: Stefan Roese <sr@...x.de>
>> Cc: Mika Westerberg <mika.westerberg@...ux.intel.com>
>> Cc: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
>> Cc: Yegor Yefremov <yegorslists@...glemail.com>
>> Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
>> Cc: Giulio Benetti <giulio.benetti@...ronovasrl.com>
>> ---
>> v3:
>> - No change
>>
>> v2:
>> - Include the problem description and analysis from Mika into the commit
>>    text, as suggested by Greg.
>>
>>   drivers/tty/serial/serial_mctrl_gpio.c | 7 +++++++
>>   1 file changed, 7 insertions(+)
>>
>> diff --git a/drivers/tty/serial/serial_mctrl_gpio.c b/drivers/tty/serial/serial_mctrl_gpio.c
>> index 39ed56214cd3..cac50b20a119 100644
>> --- a/drivers/tty/serial/serial_mctrl_gpio.c
>> +++ b/drivers/tty/serial/serial_mctrl_gpio.c
>> @@ -116,6 +116,13 @@ struct mctrl_gpios *mctrl_gpio_init_noauto(struct device *dev, unsigned int idx)
>>   
>>   	for (i = 0; i < UART_GPIO_MAX; i++) {
>>   		enum gpiod_flags flags;
>> +		char *gpio_str;
>> +
>> +		/* Check if GPIO property exists and continue if not */
>> +		gpio_str = kasprintf(GFP_KERNEL, "%s-gpios",
>> +				     mctrl_gpios_desc[i].name);
> 
> Where's the corresponding kfree?

Its missing. I'll add it in v4.

Thanks,
Stefan