linux-kernel - Re: [PATCHv2 1/2] usb: gadget: f_midi: use flexible array member for gmidi_in

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Message-ID: <569E05EF.4070808@felipetonello.com>
Date:	Tue, 19 Jan 2016 09:46:23 +0000
From:	Felipe Ferreri Tonello <eu@...ipetonello.com>
To:	Michal Nazarewicz <mina86@...a86.com>, Felipe Balbi <balbi@...com>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Dan Carpenter <dan.carpenter@...cle.com>
Cc:	Robert Baldyga <r.baldyga@...sung.com>,
	Andrzej Pietrasiewicz <andrzej.p@...sung.com>,
	Pawel Szewczyk <p.szewczyk@...sung.com>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCHv2 1/2] usb: gadget: f_midi: use flexible array member for
 gmidi_in_port elements

Hi Michal,

On 18/01/16 16:02, Michal Nazarewicz wrote:
>> On 09/01/16 03:47, Michal Nazarewicz wrote:
>>> @@ -55,7 +55,6 @@ static const char f_midi_longname[] = "MIDI Gadget";
>>>   * USB <- IN endpoint  <- rawmidi
>>>   */
>>>  struct gmidi_in_port {
>>> -	struct f_midi *midi;
> 
> On Wed, Jan 13 2016, Felipe Ferreri Tonello wrote:
>> This change is unrelated. I sent a patch removing this pointer as well.
> 
> Has it been merged yet?  Which branch?  Could you point me to the patch?

No, but it is in the mailing list.

"[PATCH 3/4] usb: gadget: f_midi: remove useless midi reference from
port struct" under "[PATCH 0/4] More improvements on MIDI gadget function"

> 
>>>  	int active;
>>>  	uint8_t cable;
>>>  	uint8_t state;
>>> @@ -1115,26 +1112,16 @@ static struct usb_function *f_midi_alloc(struct usb_function_instance *fi)
>>>  	}
>>>  
>>>  	/* allocate and initialize one new instance */
>>> -	midi = kzalloc(sizeof(*midi), GFP_KERNEL);
>>> +	midi = kzalloc(
>>> +		sizeof(*midi) + opts->in_ports * sizeof(*midi->in_ports_array),
>>> +		GFP_KERNEL);
>>
>> Is there a garantee that the compiler will always use in_ports_array at
>> the end of the allocated block?
> 
> Yep, see <https://en.wikipedia.org/wiki/Flexible_array_member>.

Thanks.

Felipe

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