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Date:	Tue, 2 Feb 2010 13:57:34 +0800
From:	"Liu Yu-B13201" <B13201@...escale.com>
To:	"Grant Likely" <grant.likely@...retlab.ca>
Cc:	<galak@...nel.crashing.org>, <davem@...emloft.net>,
	<netdev@...r.kernel.org>, <linuxppc-dev@...ts.ozlabs.org>
Subject: RE: [PATCH 2/4] mpc8569mds: Add bscr setting for rtbi mode


Thanks.
As the patchset is accepted.
Will commit another one to fix them.

 
> -----Original Message-----
> From: glikely@...retlab.ca [mailto:glikely@...retlab.ca] On 
> Behalf Of Grant Likely
> Sent: Tuesday, February 02, 2010 5:58 AM
> To: Liu Yu-B13201
> Cc: galak@...nel.crashing.org; davem@...emloft.net; 
> netdev@...r.kernel.org; linuxppc-dev@...ts.ozlabs.org
> Subject: Re: [PATCH 2/4] mpc8569mds: Add bscr setting for rtbi mode
> 
> On Thu, Jan 14, 2010 at 1:13 AM, Liu Yu <yu.liu@...escale.com> wrote:
> > Signed-off-by: Liu Yu <yu.liu@...escale.com>
> > ---
> >  arch/powerpc/platforms/85xx/mpc85xx_mds.c |   24 
> ++++++++++++++++++++++++
> >  1 files changed, 24 insertions(+), 0 deletions(-)
> >
> > diff --git a/arch/powerpc/platforms/85xx/mpc85xx_mds.c 
> b/arch/powerpc/platforms/85xx/mpc85xx_mds.c
> > index c5028a2..0872e4a 100644
> > --- a/arch/powerpc/platforms/85xx/mpc85xx_mds.c
> > +++ b/arch/powerpc/platforms/85xx/mpc85xx_mds.c
> > @@ -237,6 +237,8 @@ static void __init mpc85xx_mds_setup_arch(void)
> >                } else if (machine_is(mpc8569_mds)) {
> >  #define BCSR7_UCC12_GETHnRST   (0x1 << 2)
> >  #define BCSR8_UEM_MARVELL_RST  (0x1 << 1)
> > +#define BCSR_UCC_RGMII         (0x1 << 6)
> > +#define BCSR_UCC_RTBI          (0x1 << 5)
> >                        /*
> >                         * U-Boot mangles interrupt polarity 
> for Marvell PHYs,
> >                         * so reset built-in and UEM Marvell 
> PHYs, this puts
> > @@ -247,6 +249,28 @@ static void __init mpc85xx_mds_setup_arch(void)
> >
> >                        setbits8(&bcsr_regs[7], 
> BCSR7_UCC12_GETHnRST);
> >                        clrbits8(&bcsr_regs[8], 
> BCSR8_UEM_MARVELL_RST);
> > +
> > +                       for (np = NULL; (np = 
> of_find_compatible_node(np,
> > +                                                       "network",
> 
> Don't match on the 'type' field.  Replace "network" with NULL and just
> rely on "ucc_geth" for matching.
> 
> > +                                                       
> "ucc_geth")) != NULL;) {
> > +                               const unsigned int *prop;
> 
> u32 please.
> 
> Also, rather than reusing 'prop' for both char* and u32 values, which
> forces you to use ugly casts, use 2 local variables here.
> 
> > +                               int ucc_num;
> > +
> > +                               prop = of_get_property(np, 
> "cell-index", NULL);
> > +                               if (prop == NULL)
> > +                                       continue;
> > +
> > +                               ucc_num = *prop - 1;
> 
> Ugh.  No bounds checking...
> 
> > +
> > +                               prop = of_get_property(np, 
> "phy-connection-type", NULL);
> > +                               if (prop == NULL)
> > +                                       continue;
> > +
> > +                               if (strcmp("rtbi", (const 
> char *)prop) == 0)
> 
> (This is the ugly cast I was talking about.)
> 
> > +                                       
> clrsetbits_8(&bcsr_regs[7 + ucc_num],
> 
> ...not having bounds checking could result in badness in this 
> array index.
> 
> This patch is dangerous as written.
> 
> Finally, while using cell-index seems convenient, I think it would be
> better to have a lookup table of the index into the BCSR register
> block from the UCC base address, which also gives you implicit bounds
> checking.
> 
> g.
> 
> -- 
> Grant Likely, B.Sc., P.Eng.
> Secret Lab Technologies Ltd.
> 
> 
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