linux-kernel - Re: [PATCH 3/9] drivers/firewire/core-iso.c: Convert to use vm_insert_range

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Message-ID: <CAFqt6zY4YgsCUPFqR2yYegjqtHJ_aeE1Ao6p=fE92s2__3XTsA@mail.gmail.com>
Date:   Wed, 30 Jan 2019 15:28:55 +0530
From:   Souptick Joarder <jrdr.linux@...il.com>
To:     Andrew Morton <akpm@...ux-foundation.org>,
        Matthew Wilcox <willy@...radead.org>,
        Michal Hocko <mhocko@...e.com>, stefanr@...6.in-berlin.de,
        Russell King - ARM Linux <linux@...linux.org.uk>,
        robin.murphy@....com
Cc:     linux-kernel@...r.kernel.org, Linux-MM <linux-mm@...ck.org>,
        linux-arm-kernel@...ts.infradead.org,
        linux1394-devel@...ts.sourceforge.net
Subject: Re: [PATCH 3/9] drivers/firewire/core-iso.c: Convert to use vm_insert_range_buggy

On Fri, Jan 25, 2019 at 11:55 AM Souptick Joarder <jrdr.linux@...il.com> wrote:
>
> On Fri, Jan 11, 2019 at 8:34 PM Souptick Joarder <jrdr.linux@...il.com> wrote:
> >
> > Convert to use vm_insert_range_buggy to map range of kernel memory
> > to user vma.
> >
> > This driver has ignored vm_pgoff and mapped the entire pages. We
> > could later "fix" these drivers to behave according to the normal
> > vm_pgoff offsetting simply by removing the _buggy suffix on the
> > function name and if that causes regressions, it gives us an easy
> > way to revert.
> >
> > Signed-off-by: Souptick Joarder <jrdr.linux@...il.com>
>
> Any comment on this patch ?

Any comment on this patch ?

>
> > ---
> >  drivers/firewire/core-iso.c | 15 ++-------------
> >  1 file changed, 2 insertions(+), 13 deletions(-)
> >
> > diff --git a/drivers/firewire/core-iso.c b/drivers/firewire/core-iso.c
> > index 35e784c..99a6582 100644
> > --- a/drivers/firewire/core-iso.c
> > +++ b/drivers/firewire/core-iso.c
> > @@ -107,19 +107,8 @@ int fw_iso_buffer_init(struct fw_iso_buffer *buffer, struct fw_card *card,
> >  int fw_iso_buffer_map_vma(struct fw_iso_buffer *buffer,
> >                           struct vm_area_struct *vma)
> >  {
> > -       unsigned long uaddr;
> > -       int i, err;
> > -
> > -       uaddr = vma->vm_start;
> > -       for (i = 0; i < buffer->page_count; i++) {
> > -               err = vm_insert_page(vma, uaddr, buffer->pages[i]);
> > -               if (err)
> > -                       return err;
> > -
> > -               uaddr += PAGE_SIZE;
> > -       }
> > -
> > -       return 0;
> > +       return vm_insert_range_buggy(vma, buffer->pages,
> > +                                       buffer->page_count);
> >  }
> >
> >  void fw_iso_buffer_destroy(struct fw_iso_buffer *buffer,
> > --
> > 1.9.1
> >