linux-kernel - Re: [PATCH 1/2] mailbox: samsung: added support for samsung mailbox

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Date:	Tue, 18 Mar 2014 03:56:48 -0700
From:	Joe Perches <joe@...ches.com>
To:	Girish KS <girishks2000@...il.com>
Cc:	Girish K S <ks.giri@...sung.com>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>, devicetree@...r.kernel.org,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Jassi Singh <jassisinghbrar@...il.com>,
	"Anna, Suman" <s-anna@...com>, Ilho Lee <ilho215.lee@...sung.com>
Subject: Re: [PATCH 1/2] mailbox: samsung: added support for samsung mailbox

On Tue, 2014-03-18 at 15:52 +0530, Girish KS wrote:
> On Mon, Mar 17, 2014 at 5:33 PM, Girish K S <ks.giri@...sung.com> wrote:

Hi, just some trivial notes about the patch

> > diff --git a/drivers/mailbox/mailbox-samsung.c b/drivers/mailbox/mailbox-samsung.c
[]
> > @@ -0,0 +1,354 @@
> > +/*
> > + * Copyright 2013 Samsung Electronics Co. Ltd.
> > + *
> > + * This program is free software; you can redistribute it and/or modify it
> > + * under the terms and conditions of the GNU General Public License,
> > + * version 2, as published by the Free Software Foundation.
> > + *
> > + * This program is distributed in the hope it will be useful, but WITHOUT
> > + * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
> > + * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
> > + * more details.
> > + *
> > + * You should have received a copy of the GNU General Public License along with
> > + * this program.  If not, see <http://www.gnu.org/licenses/>.
> > + */

Please add

#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt

before any #include so that error messages are
prefixed in the output with "samsung-mailbox: "
and the reader of the log has an idea what subsystem
is emitting messages.

> > +#include <linux/err.h>
> > +#include <linux/module.h>
> > +#include <linux/slab.h>
[]
> > +static int samsung_mbox_send_data(struct ipc_link *link, void *msg)
> > +{
[]
> > +       /* Lock the mailbox for this transaction with the client id */
> > +       writel(val, ipc_base + MBOX_REG_TXLOCK);
> > +       do {
> > +               if (time_after(jiffies, timeout)) {
> > +                       pr_err("cannot aquire the lock\n");

This would be prefixed appropriately via pr_fmt.
Also, there's a typo of aquire here: acquire

> > +static int samsung_mbox_startup(struct ipc_link *link, void *ignored)
> > +{
[]
> > +       ret = devm_request_irq(dev, samsung_link->irq, samsung_ipc_handler,
> > +                                       IRQF_SHARED, link->link_name,
> > +                                       samsung_link);
> > +       if (unlikely(ret)) {
> > +               pr_err("failed to register mailbox interrupt:%d\n", ret);

Here too it would be prefixed

> > +static int samsung_mbox_probe(struct platform_device *pdev)
> > +{
> > +       struct samsung_mbox *samsung_mbox;
> > +       struct samsung_mlink *mbox_link;
> > +       struct resource res;
> > +       struct ipc_link **link;
> > +       int loop, count, ret = 0;
> > +       struct device_node *node = pdev->dev.of_node;
> > +
> > +       if (!node) {
> > +               dev_err(&pdev->dev, "driver doesnt support"
> > +                               "non-dt devices\n");

Please coalesce the format fragments.

You would notice the missing space between
"support" and "non-dt"

		dev_err(&pdev->dev, "driver does not support non-dt devices\n");

It's OK to exceed 80 columns for these format strings.

> > diff --git a/include/linux/mailbox-samsung.h b/include/linux/mailbox-samsung.h
[]
> > +static inline unsigned long get_alligned_buffer(void)

Typo: There's one l in aligned

> > +{
> > +       return __get_free_pages(GFP_KERNEL, REQUEST_PAGE_ORDER);
> > +}
> > +
> > +static inline void put_alligned_buffer(unsigned long addr)
> > +{

here too

> > +       free_pages(addr, REQUEST_PAGE_ORDER);
> > +}
> > +


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