linux-kernel - Re: [PATCHv4 2/5] mailbox: Introduce framework for mailbox

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Message-ID: <CAJe_ZhcM6d0ODTsOsuUwLwWSWE_hyCufmwW8_hxnqPdMQ2ukSg@mail.gmail.com>
Date:	Wed, 19 Mar 2014 10:50:22 +0530
From:	Jassi Brar <jaswinder.singh@...aro.org>
To:	Girish KS <girishks2000@...il.com>
Cc:	Jassi Brar <jassisinghbrar@...il.com>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	"Anna, Suman" <s-anna@...com>, Tony Lindgren <tony@...mide.com>,
	"Omar Ramirez Luna (omar.ramirez@...itl.com)" 
	<omar.ramirez@...itl.com>, Loic Pallardy <loic.pallardy@...com>,
	LeyFoon Tan <lftan.linux@...il.com>,
	Craig McGeachie <slapdau@...oo.com.au>,
	Courtney Cavin <courtney.cavin@...ymobile.com>,
	"Rafael J. Wysocki" <rafael.j.wysocki@...el.com>,
	Rob Herring <robherring2@...il.com>,
	Arnd Bergmann <arnd@...db.de>,
	Josh Cartwright <joshc@...eaurora.org>,
	Linus Walleij <linus.walleij@...aro.org>,
	Kumar Gala <galak@...eaurora.org>,
	"ks.giri@...sung.com" <ks.giri@...sung.com>
Subject: Re: [PATCHv4 2/5] mailbox: Introduce framework for mailbox

On 19 March 2014 09:30, Girish KS <girishks2000@...il.com> wrote:
> On Wed, Mar 19, 2014 at 12:15 AM, Jassi Brar <jassisinghbrar@...il.com> wrote:

>> +int mbox_send_message(struct mbox_chan *chan, void *mssg)
>> +{
>> +       int t;
>> +
>> +       if (!chan || !chan->cl)
>> +               return -EINVAL;
>> +
>> +       t = _add_to_rbuf(chan, mssg);
>> +       if (t < 0) {
>> +               pr_err("Try increasing MBOX_TX_QUEUE_LEN\n");
>> +               return t;
>> +       }
>> +
>> +       _msg_submit(chan);
>> +
>> +       if (chan->txdone_method == TXDONE_BY_POLL)
>> +               poll_txdone((unsigned long)chan->con);
>
> I came across a panic in the complete function. When i traced bact the
> call sequence it was
> When a client sets chan->cl->tx_block = true, and polling is enabled
> for controller.
> 1.Client sends the message with  mbox_send_message. This function as
> seen above will call __msg_submit (this calls the controller specific
> send function).
> 2. Since the tx method is polling the above condition is satisfied and
> calls the poll_txdone function.
> 3. In this poll function, the tx_tick function is invoked.
> 4. In this tick function since the client has enabled the tx_block it
> calls the notify function complete(&chan->tx_complete);
> 5. Here there is a panic. because the complete is called before
> initialization. init_completion needs to be called but not called.
>
Are you sure you have applied the patch "[PATCHv4 4/5] mailbox: Fix TX
completion init" ?

Thanks
Jassi
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