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From: Biju Das <biju.das@bp.renesas.com>
To: Wolfram Sang <wsa@the-dreams.de>
Cc: Kishon Vijay Abraham I <kishon@ti.com>,
	Dan Carpenter <dan.carpenter@oracle.com>,
	Wolfram Sang <wsa+renesas@sang-engineering.com>,
	Simon Horman <horms+renesas@verge.net.au>,
	Yoshihiro Shimoda <yoshihiro.shimoda.uh@renesas.com>,
	Simon Horman <horms@verge.net.au>,
	Geert Uytterhoeven <geert+renesas@glider.be>,
	Chris Paterson <Chris.Paterson2@renesas.com>,
	Fabrizio Castro <fabrizio.castro@bp.renesas.com>,
	"linux-renesas-soc@vger.kernel.org" 
	<linux-renesas-soc@vger.kernel.org>
Subject: RE: [PATCH] phy: renesas: phy-rcar-gen2: Fix the array off by one warning
Date: Thu, 16 May 2019 12:32:08 +0000
Message-ID: <OSBPR01MB21031BCDA0AEBD7A6EE6E9A9B80A0@OSBPR01MB2103.jpnprd01.prod.outlook.com> (raw)
In-Reply-To: <20190516121659.GA2832@kunai>

Hi Wolfram,

Thanks for the feedback.

> Subject: Re: [PATCH] phy: renesas: phy-rcar-gen2: Fix the array off by one
> warning
> 
> >  		error = of_property_read_u32(np, "reg", &channel_num);
> > -		if (error || channel_num > 2) {
> > +		if (error || channel_num > data->last_channel) {
> 
> Just an idea, I haven't tested it: Couldn't we use
> ARRAY_SIZE(data->select_value) to avoid the extra member in the struct?

I checked this now. It is giving the below build errors

In file included from ./include/linux/kernel.h:16:0,
                 from ./include/linux/clk.h:16,
                 from drivers/phy/renesas/phy-rcar-gen2.c:10:
drivers/phy/renesas/phy-rcar-gen2.c: In function 'rcar_gen2_phy_probe':
./include/linux/build_bug.h:16:45: error: negative width in bit-field '<anonymous>'
 #define BUILD_BUG_ON_ZERO(e) (sizeof(struct { int:(-!!(e)); }))
                                             ^
./include/linux/compiler.h:351:28: note: in expansion of macro 'BUILD_BUG_ON_ZERO'
 #define __must_be_array(a) BUILD_BUG_ON_ZERO(__same_type((a), &(a)[0]))
                            ^
./include/linux/kernel.h:47:59: note: in expansion of macro '__must_be_array'
 #define ARRAY_SIZE(arr) (sizeof(arr) / sizeof((arr)[0]) + __must_be_array(arr))
                                                           ^
drivers/phy/renesas/phy-rcar-gen2.c:398:30: note: in expansion of macro 'ARRAY_SIZE'
   if (error || channel_num > ARRAY_SIZE(data->select_value)) {
                              ^
scripts/Makefile.build:278: recipe for target 'drivers/phy/renesas/phy-rcar-gen2.o' failed

regards,
Biju



  reply index

Thread overview: 8+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-05-15 13:43 Biju Das
2019-05-16 11:13 ` Simon Horman
2019-05-16 12:16 ` Wolfram Sang
2019-05-16 12:32   ` Biju Das [this message]
2019-05-16 12:34   ` Geert Uytterhoeven
2019-05-16 13:25     ` Wolfram Sang
2019-05-16 12:40 ` Geert Uytterhoeven
2019-05-16 13:03   ` Biju Das

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