Re: [PATCH v10 14/14] dmaengine: idxd: Add support for device/wq defaults

[Tom Zanussi]

Hi Fenghua,

On Thu, 2023-11-30 at 00:31 +0000, Yu, Fenghua wrote:
> Hi, Tom,
> 
> > From: Tom Zanussi <tom.zanussi@xxxxxxxxxxxxxxx>
> > > > +       /* set name to "iaa_crypto" */
> > > > +       memset(wq->name, 0, WQ_NAME_SIZE + 1);
> > > > +       strscpy(wq->name, "iaa_crypto", WQ_NAME_SIZE + 1);
> > > 
> > > Is strcpy(wq->name, "iaa_crypto") simpler than memset() and
> > > strscpy()?
> > 
> > That's what I originally had, but checkpatch complained about it,
> > suggesting
> > strscpy, so I changed it to make checkpatch happy.
> 
> Why is size WQ_NAME_SIZE+1 instead of WQ_NAME_SIZE? Will
> WQ_NAME_SIZE+1 cause mem corruption because wq->name is defined as a
> string with WQ_NAME_SIZE?

No, wq->name actually is:

        char name[WQ_NAME_SIZE + 1];

This code is doing the same thing as elsewhere in the idxd driver
except instead of sprintf() it uses strscpy().

> > 
> > > 
> > > > +
> > > > +       /* set driver_name to "crypto" */
> > > > +       memset(wq->driver_name, 0, DRIVER_NAME_SIZE + 1);
> > > > +       strscpy(wq->driver_name, "crypto", DRIVER_NAME_SIZE +
> > > > 1);
> > > 
> > > Is strcpy(wq->driver_name, "crypto") simpler?
> > 
> > Same here.
> 
> Ditto.
> 

Same.

Tom

> Thanks.
> 
> -Fenghua