linux-kernel - Re: [PATCH] usb/peak

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Date:   Wed, 11 May 2022 10:47:05 +0200
From:   Marc Kleine-Budde <mkl@...gutronix.de>
To:     Vincent MAILHOL <mailhol.vincent@...adoo.fr>
Cc:     z <zhaojunkui2008@....com>,
        Wolfgang Grandegger <wg@...ndegger.com>,
        "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>,
        Stefan Mätje <stefan.maetje@....eu>,
        linux-can@...r.kernel.org, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org, bernard@...o.com
Subject: Re: [PATCH] usb/peak_usb: cleanup code

On 11.05.2022 17:28:26, Vincent MAILHOL wrote:
> On Wed. 11 May 2022 at 16:11, z <zhaojunkui2008@....com> wrote:
> > At 2022-05-11 14:44:50, "Marc Kleine-Budde" <mkl@...gutronix.de> wrote:
> > >On 10.05.2022 23:38:38, Bernard Zhao wrote:
> > >> The variable fi and bi only used in branch if (!dev->prev_siblings)
> > >> , fi & bi not kmalloc in else branch, so move kfree into branch
> > >> if (!dev->prev_siblings),this change is to cleanup the code a bit.
> > >
> > >Please move the variable declaration into that scope, too. Adjust the
> > >error handling accordingly.
> >
> > Hi Marc:
> >
> > I am not sure if there is some gap.
> > If we move the variable declaration into that scope, then each error branch has to do the kfree job, like:
> > if (err) {
> >                         dev_err(dev->netdev->dev.parent,
> >                                 "unable to read %s firmware info (err %d)\n",
> >                                 pcan_usb_pro.name, err);
> >                         kfree(bi);
> >                         kfree(fi);
> >                         kfree(usb_if);
> >
> >                        return err;
> >                 }
> > I am not sure if this looks a little less clear?
> > Thanks!
> 
> A cleaner way would be to move all the content of the if
> (!dev->prev_siblings) to a new function.

Good idea.

Marc

-- 
Pengutronix e.K.                 | Marc Kleine-Budde           |
Embedded Linux                   | https://www.pengutronix.de  |
Vertretung West/Dortmund         | Phone: +49-231-2826-924     |
Amtsgericht Hildesheim, HRA 2686 | Fax:   +49-5121-206917-5555 |

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