linux-kernel - Re: [PATCH v2 1/2] binder: Add default binder devices through binderfs when configured

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Date:   Wed, 7 Aug 2019 09:51:46 -0700
From:   Hridya Valsaraju <hridya@...gle.com>
To:     Dan Carpenter <dan.carpenter@...cle.com>
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Arve Hjønnevåg <arve@...roid.com>,
        Todd Kjos <tkjos@...roid.com>,
        Martijn Coenen <maco@...roid.com>,
        Joel Fernandes <joel@...lfernandes.org>,
        Christian Brauner <christian@...uner.io>,
        devel@...verdev.osuosl.org, linux-kernel@...r.kernel.org,
        Christian Brauner <christian.brauner@...ntu.com>,
        kernel-team@...roid.com
Subject: Re: [PATCH v2 1/2] binder: Add default binder devices through
 binderfs when configured

On Wed, Aug 7, 2019 at 4:02 AM Dan Carpenter <dan.carpenter@...cle.com> wrote:
>
> On Tue, Aug 06, 2019 at 11:40:05AM -0700, Hridya Valsaraju wrote:
> > @@ -467,6 +466,9 @@ static int binderfs_fill_super(struct super_block *sb, void *data, int silent)
> >       int ret;
> >       struct binderfs_info *info;
> >       struct inode *inode = NULL;
> > +     struct binderfs_device device_info = { 0 };
> > +     const char *name;
> > +     size_t len;
> >
> >       sb->s_blocksize = PAGE_SIZE;
> >       sb->s_blocksize_bits = PAGE_SHIFT;
> > @@ -521,7 +523,24 @@ static int binderfs_fill_super(struct super_block *sb, void *data, int silent)
> >       if (!sb->s_root)
> >               return -ENOMEM;
> >
> > -     return binderfs_binder_ctl_create(sb);
> > +     ret = binderfs_binder_ctl_create(sb);
> > +     if (ret)
> > +             return ret;
> > +
> > +     name = binder_devices_param;
> > +     for (len = strcspn(name, ","); len > 0; len = strcspn(name, ",")) {
> > +             strscpy(device_info.name, name, len + 1);
> > +             ret = binderfs_binder_device_create(inode, NULL, &device_info);
> > +             if (ret)
> > +                     return ret;
>
> We should probably clean up before returning...  The error handling code
> would probably be tricky to write though and it's not super common.

Thank you for taking a look Dan. Did you mean cleaning up the default
devices that were already created? They will actually be cleaned up by
binderfs_evict_inode() during the super block's cleanup since the
mount operation will fail due to an error here.

>
> > +             name += len;
> > +             if (*name == ',')
> > +                     name++;
> > +
> > +     }
> > +
> > +     return 0;
> > +
>
> Remove this extra blank line.

Will do in v3, thanks for catching this Dan!

>
> >  }
>
> regards,
> dan carpenter
>
> --
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