Date:   Tue, 14 Apr 2020 10:11:27 -0600
From:   Mathieu Poirier <mathieu.poirier@...aro.org>
To:     Alex Elder <elder@...aro.org>
Cc:     Bjorn Andersson <bjorn.andersson@...aro.org>,
        Ohad Ben-Cohen <ohad@...ery.com>, Suman Anna <s-anna@...com>,
        linux-remoteproc <linux-remoteproc@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 2/4] remoteproc: Split firmware name allocation from rproc_alloc()

On Mon, 13 Apr 2020 at 14:56, Alex Elder <elder@...aro.org> wrote:
>
> On 4/13/20 2:33 PM, Mathieu Poirier wrote:
> > Make the firmware name allocation a function on its own in order to
> > introduce more flexibility to function rproc_alloc().
> >
> > Signed-off-by: Mathieu Poirier <mathieu.poirier@...aro.org>
>
> I didn't look at the larger context (MCU series); I'm only looking
> at this (and the others in this series) in isolation.  I like
> that you're encapsulating this stuff into functions but doing so
> doesn't really add any flexibility.

You are correct.  I wrote the changelog with the MCU synchronisation
series in mind but this specific part of the work has nothing to do
with flexibility - it is a plane cleanup exercise.  I will address
that in the next revision.

Thanks,
Mathieu


>
> Two small suggestions for you to consider but they're truly
> more about style so it's entirely up to you.  Outside of that
> this looks straightforward to me, and the result of the series
> is an improvement.
>
> I'll let you comment on my suggestions before offering my
> "reviewed-by" indication.
>
>                                         -Alex
>
> > ---
> >  drivers/remoteproc/remoteproc_core.c | 66 ++++++++++++++++------------
> >  1 file changed, 39 insertions(+), 27 deletions(-)
> >
> > diff --git a/drivers/remoteproc/remoteproc_core.c b/drivers/remoteproc/remoteproc_core.c
> > index 80056513ae71..4dee63f319ba 100644
> > --- a/drivers/remoteproc/remoteproc_core.c
> > +++ b/drivers/remoteproc/remoteproc_core.c
> > @@ -1979,6 +1979,33 @@ static const struct device_type rproc_type = {
> >       .release        = rproc_type_release,
> >  };
> >
> > +static int rproc_alloc_firmware(struct rproc *rproc,
> > +                             const char *name, const char *firmware)
> > +{
> > +     char *p, *template = "rproc-%s-fw";
> > +     int name_len;
>
> Not a big deal (and maybe it's not consistent with other nearby
> style) but template and name_len could be defined inside the
> "if (!firmware)" block.
>
> > +     if (!firmware) {
> > +             /*
> > +              * If the caller didn't pass in a firmware name then
> > +              * construct a default name.
> > +              */
> > +             name_len = strlen(name) + strlen(template) - 2 + 1;
> > +             p = kmalloc(name_len, GFP_KERNEL);
>
>
> I don't know if it would be an improvement, but you could
> check for a null p value below for both cases.  I.e.:
>
>                 if (p)
>                         snprintf(p, ...);
>
> (more below)
>
> > +             if (!p)
> > +                     return -ENOMEM;
> > +             snprintf(p, name_len, template, name);
> > +     } else {
> > +             p = kstrdup(firmware, GFP_KERNEL);
> > +             if (!p)
> > +                     return -ENOMEM;
> > +     }
> > +
>
>         if (!p)
>                 return -ENOMEM;
>
> > +     rproc->firmware = p;
> > +
> > +     return 0;
> > +}
> > +
> >  /**
> >   * rproc_alloc() - allocate a remote processor handle
> >   * @dev: the underlying device
> > @@ -2007,42 +2034,21 @@ struct rproc *rproc_alloc(struct device *dev, const char *name,
> >                         const char *firmware, int len)
> >  {
> >       struct rproc *rproc;
> > -     char *p, *template = "rproc-%s-fw";
> > -     int name_len;
> >
> >       if (!dev || !name || !ops)
> >               return NULL;
> >
> > -     if (!firmware) {
> > -             /*
> > -              * If the caller didn't pass in a firmware name then
> > -              * construct a default name.
> > -              */
> > -             name_len = strlen(name) + strlen(template) - 2 + 1;
> > -             p = kmalloc(name_len, GFP_KERNEL);
> > -             if (!p)
> > -                     return NULL;
> > -             snprintf(p, name_len, template, name);
> > -     } else {
> > -             p = kstrdup(firmware, GFP_KERNEL);
> > -             if (!p)
> > -                     return NULL;
> > -     }
> > -
> >       rproc = kzalloc(sizeof(struct rproc) + len, GFP_KERNEL);
> > -     if (!rproc) {
> > -             kfree(p);
> > +     if (!rproc)
> >               return NULL;
> > -     }
> > +
> > +     if (rproc_alloc_firmware(rproc, name, firmware))
> > +             goto free_rproc;
> >
> >       rproc->ops = kmemdup(ops, sizeof(*ops), GFP_KERNEL);
> > -     if (!rproc->ops) {
> > -             kfree(p);
> > -             kfree(rproc);
> > -             return NULL;
> > -     }
> > +     if (!rproc->ops)
> > +             goto free_firmware;
> >
> > -     rproc->firmware = p;
> >       rproc->name = name;
> >       rproc->priv = &rproc[1];
> >       rproc->auto_boot = true;
> > @@ -2091,6 +2097,12 @@ struct rproc *rproc_alloc(struct device *dev, const char *name,
> >       rproc->state = RPROC_OFFLINE;
> >
> >       return rproc;
> > +
> > +free_firmware:
> > +     kfree(rproc->firmware);
> > +free_rproc:
> > +     kfree(rproc);
> > +     return NULL;
> >  }
> >  EXPORT_SYMBOL(rproc_alloc);
> >
> >
>

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