linux-kernel - Re: [PATCH 4/9] mailbox: create opened message type

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Date:	Fri, 21 Dec 2012 11:50:01 +0100
From:	Loic PALLARDY <loic.pallardy@...com>
To:	"Bedia, Vaibhav" <vaibhav.bedia@...com>
Cc:	Loic PALLARDY STE <loic.pallardy-ext@...ricsson.com>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Ohad Ben-Cohen <ohad@...ery.com>,
	"linux-omap@...r.kernel.org" <linux-omap@...r.kernel.org>,
	Russell King <linux@....linux.org.uk>,
	Arnd Bergmann <arnd@...db.de>,
	Janusz Krzysztofik <jkrzyszt@....icnet.pl>,
	Tony Lindgren <tony@...mide.com>,
	Linus Walleij <linus.walleij@...aro.org>,
	Mark Brown <broonie@...nsource.wolfsonmicro.com>,
	"Gutierrez, Juan" <jgutierrez@...com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Felipe Contreras <felipe.contreras@...ia.com>,
	Dom Cobley <popcornmix@...il.com>,
	Wim Van Sebroeck <wim@...ana.be>,
	Omar Ramirez Luna <omar.ramirez@...itl.com>,
	Tejun Heo <tj@...nel.org>, "Anna, Suman" <s-anna@...com>,
	STEricsson_nomadik_linux <STEricsson_nomadik_linux@...t.st.com>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>
Subject: Re: [PATCH 4/9] mailbox: create opened message type



On 12/21/2012 11:28 AM, Bedia, Vaibhav wrote:
> On Tue, Dec 18, 2012 at 18:40:07, Loic Pallardy wrote:

>> -	msg = mbox_read_reg(fifo->data);
>> -	msg |= ((mbox_msg_t) mbox_read_reg(fifo->cmd))<<  16;
>> +	msg->header = mbox_read_reg(fifo->data);
>> +	msg->header |= ((mbox_msg_t) mbox_read_reg(fifo->cmd))<<  16;
>
> Now that struct mailbox_msg encapsulates the data, you can
> get rid of the mbox_msg_t typedef completely. Having the data
> as part of the mailbox_msg along with the functions with mbox_msg_t
> as the return type just creates confusion IMHO.
>
OK I'll clean up mbox_msg_t typedef.
>>
>> -	return msg;
>> +	return 0;
>>   }
>
> Convert all return 0 functions to void?
>
> [...]
>
Yes, agree I'll change the prototype.
>>
>> +
>> +#define MAILBOX_FILL_HEADER_MSG(_msg, _header) \
>> +	MAILBOX_FILL_MSG(_msg, _header, NULL, 0);
>> +
>
> I used these patches as part of the suspend-resume support for AM335x
> which has the same mailbox IP as OMAP4. I used the MAILBOX_FILL_HEADER_MSG
> helper and things work as expected.

Nice.
>
> However, I found the 'header' part to be very confusing. Why not treat the
> OMAP case as a special case of the new MAILBOX_FILL_MSG where the data size
> is set to 1?

Yes it is another possibility. Changes are not big.
Omar, what's your view on this point?

Regards,
Loic
>
> Regards,
> Vaibhav--
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