On Mon 13 Apr 13:56 PDT 2020, Alex Elder 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@xxxxxxxxxx>
>
> 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.
>
> 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.
>
I prefer variables declared in the beginning of the function, so I'm
happy with this.
> > + 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, ...);
>
Moving the common NULL check and return out seems nice, but given that
we then have to have this positive conditional I think the end result is
more complex.
That said, if we're not just doing a verbatim copy from rproc_alloc() I
think we should make this function:
if (!firmware)
p = kasprintf(GFP_KERNEL, "rproc-%s-fw", name);
else
p = kstrdup_const(firmware, GFP_KERNEL);
rproc->firmware = p;
return p ? 0 : -ENOMEM;
Regards,
Bjorn
> (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);
> >
> >
>
