2019-01-11 15:07:31

by Souptick Joarder

Subject: [PATCH 3/9] drivers/firewire/core-iso.c: Convert to use vm_insert_range_buggy

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 <[email protected]>
---
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

2019-01-25 06:27:54

by Souptick Joarder

Subject: Re: [PATCH 3/9] drivers/firewire/core-iso.c: Convert to use vm_insert_range_buggy

On Fri, Jan 11, 2019 at 8:34 PM Souptick Joarder <[email protected]> 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 <[email protected]>

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
>

2019-01-30 09:59:36

by Souptick Joarder

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 <[email protected]> wrote:
>
> On Fri, Jan 11, 2019 at 8:34 PM Souptick Joarder <[email protected]> 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 <[email protected]>
>
> 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
> >