linux-kernel - RE: [PATCH 2/6] fpga: zynqmp: Initialized variables before using it

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Message-ID: <SN6PR02MB45765A42BF873BDC02DF210EC2179@SN6PR02MB4576.namprd02.prod.outlook.com>
Date:   Tue, 22 Mar 2022 06:55:44 +0000
From:   Nava kishore Manne <navam@...inx.com>
To:     Xu Yilun <yilun.xu@...el.com>
CC:     "mdf@...nel.org" <mdf@...nel.org>,
        "hao.wu@...el.com" <hao.wu@...el.com>,
        "trix@...hat.com" <trix@...hat.com>,
        Michal Simek <michals@...inx.com>,
        "linux-fpga@...r.kernel.org" <linux-fpga@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>
Subject: RE: [PATCH 2/6] fpga: zynqmp: Initialized variables before using it

Hi Yilun,

	Please find my response inline.

> -----Original Message-----
> From: Xu Yilun <yilun.xu@...el.com>
> Sent: Tuesday, March 15, 2022 9:39 PM
> To: Nava kishore Manne <navam@...inx.com>
> Cc: mdf@...nel.org; hao.wu@...el.com; trix@...hat.com; Michal Simek
> <michals@...inx.com>; linux-fpga@...r.kernel.org; linux-
> kernel@...r.kernel.org; linux-arm-kernel@...ts.infradead.org
> Subject: Re: [PATCH 2/6] fpga: zynqmp: Initialized variables before using it
> 
> On Tue, Mar 15, 2022 at 11:48:11AM +0000, Nava kishore Manne wrote:
> > Hi Yilun,
> >
> > 	Thanks for providing the review comments.
> > Please find my response inline.
> >
> > > -----Original Message-----
> > > From: Xu Yilun <yilun.xu@...el.com>
> > > Sent: Friday, March 11, 2022 7:58 PM
> > > To: Nava kishore Manne <navam@...inx.com>
> > > Cc: mdf@...nel.org; hao.wu@...el.com; trix@...hat.com; Michal Simek
> > > <michals@...inx.com>; linux-fpga@...r.kernel.org; linux-
> > > kernel@...r.kernel.org; linux-arm-kernel@...ts.infradead.org
> > > Subject: Re: [PATCH 2/6] fpga: zynqmp: Initialized variables before
> > > using it
> > >
> > > On Tue, Mar 08, 2022 at 03:15:15PM +0530, Nava kishore Manne wrote:
> > > > This patch initialized variables with the proper value.
> > > > Addresses-Coverity: "uninit_use: Using uninitialized value"
> > > >
> > > > Signed-off-by: Nava kishore Manne <nava.manne@...inx.com>
> > > > ---
> > > >  drivers/fpga/zynqmp-fpga.c | 2 +-
> > > >  1 file changed, 1 insertion(+), 1 deletion(-)
> > > >
> > > > diff --git a/drivers/fpga/zynqmp-fpga.c
> > > > b/drivers/fpga/zynqmp-fpga.c index c60f20949c47..e931d69819a7
> > > > 100644
> > > > --- a/drivers/fpga/zynqmp-fpga.c
> > > > +++ b/drivers/fpga/zynqmp-fpga.c
> > > > @@ -41,7 +41,7 @@ static int zynqmp_fpga_ops_write(struct
> > > fpga_manager *mgr,
> > > >  				 const char *buf, size_t size)  {
> > > >  	struct zynqmp_fpga_priv *priv;
> > > > -	dma_addr_t dma_addr;
> > > > +	dma_addr_t dma_addr = 0;
> > >
> > > The first use of this variable is as an output parameter:
> > >
> > > 	kbuf = dma_alloc_coherent(priv->dev, size, &dma_addr,
> GFP_KERNEL);
> > >
> > > So I don't think it needs to be initialized as 0.
> > >
> >
> > This issue is found by Coverity Scan, Whether this param is input/output
> this fix will not impact the actual functionality.
> > In order to fix the issues reported by the Coverity tool, this fix is needed.
> 
> I didn't see issues about this piece of code, so I don't think we need the fix
> just to make the tool happy. Maybe the tool could be improved to help us
> better.
> 

Agreed, I will drop this patch in v2.

Regards,
Navakishore.