* [PATCH] no need for checking it
@ 2009-06-06 10:51 Figo.zhang
2009-06-06 10:56 ` Pekka Enberg
2009-06-06 11:11 ` [PATCH V2] " Figo.zhang
0 siblings, 2 replies; 5+ messages in thread
From: Figo.zhang @ 2009-06-06 10:51 UTC (permalink / raw)
To: Greg Kroah-Hartman; +Cc: Ian Abbott, Frank Mori Hess, David Schleef, lkml
vfree() does it's own NULL checking,so no need for check before
calling it.
Signed-off-by: Figo.zhang <figo1802@gmail.com>
---
drivers/staging/comedi/drivers.c | 6 +++---
1 files changed, 3 insertions(+), 3 deletions(-)
diff --git a/drivers/staging/comedi/drivers.c
b/drivers/staging/comedi/drivers.c
index 6e13e45..ce50e85 100644
--- a/drivers/staging/comedi/drivers.c
+++ b/drivers/staging/comedi/drivers.c
@@ -495,9 +495,9 @@ int comedi_buf_alloc(struct comedi_device *dev,
struct comedi_subdevice *s,
vmap(pages, n_pages, VM_MAP,
PAGE_KERNEL_NOCACHE);
}
- if (pages) {
- vfree(pages);
- }
+ vfree(pages);
+ pages = NULL;
+
if (async->prealloc_buf == NULL) {
/* Some allocation failed above. */
if (async->buf_page_list) {
^ permalink raw reply related [flat|nested] 5+ messages in thread* Re: [PATCH] no need for checking it
2009-06-06 10:51 [PATCH] no need for checking it Figo.zhang
@ 2009-06-06 10:56 ` Pekka Enberg
2009-06-06 11:08 ` Figo.zhang
2009-06-06 11:11 ` [PATCH V2] " Figo.zhang
1 sibling, 1 reply; 5+ messages in thread
From: Pekka Enberg @ 2009-06-06 10:56 UTC (permalink / raw)
To: Figo.zhang
Cc: Greg Kroah-Hartman, Ian Abbott, Frank Mori Hess, David Schleef,
lkml
On Sat, Jun 6, 2009 at 1:51 PM, Figo.zhang <figo1802@gmail.com> wrote:
> vfree() does it's own NULL checking,so no need for check before
> calling it.
>
> Signed-off-by: Figo.zhang <figo1802@gmail.com>
> ---
> drivers/staging/comedi/drivers.c | 6 +++---
> 1 files changed, 3 insertions(+), 3 deletions(-)
>
> diff --git a/drivers/staging/comedi/drivers.c
> b/drivers/staging/comedi/drivers.c
> index 6e13e45..ce50e85 100644
> --- a/drivers/staging/comedi/drivers.c
> +++ b/drivers/staging/comedi/drivers.c
> @@ -495,9 +495,9 @@ int comedi_buf_alloc(struct comedi_device *dev,
> struct comedi_subdevice *s,
> vmap(pages, n_pages, VM_MAP,
> PAGE_KERNEL_NOCACHE);
> }
> - if (pages) {
> - vfree(pages);
> - }
> + vfree(pages);
> + pages = NULL;
Why the assignment to NULL? It looks redundant to me.
> +
> if (async->prealloc_buf == NULL) {
> /* Some allocation failed above. */
> if (async->buf_page_list) {
>
>
> --
> To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
> the body of a message to majordomo@vger.kernel.org
> More majordomo info at http://vger.kernel.org/majordomo-info.html
> Please read the FAQ at http://www.tux.org/lkml/
>
^ permalink raw reply [flat|nested] 5+ messages in thread* Re: [PATCH] no need for checking it
2009-06-06 10:56 ` Pekka Enberg
@ 2009-06-06 11:08 ` Figo.zhang
0 siblings, 0 replies; 5+ messages in thread
From: Figo.zhang @ 2009-06-06 11:08 UTC (permalink / raw)
To: Pekka Enberg
Cc: Greg Kroah-Hartman, Ian Abbott, Frank Mori Hess, David Schleef,
lkml
On Sat, 2009-06-06 at 13:56 +0300, Pekka Enberg wrote:
> On Sat, Jun 6, 2009 at 1:51 PM, Figo.zhang <figo1802@gmail.com> wrote:
> > vfree() does it's own NULL checking,so no need for check before
> > calling it.
> >
> > Signed-off-by: Figo.zhang <figo1802@gmail.com>
> > ---
> > drivers/staging/comedi/drivers.c | 6 +++---
> > 1 files changed, 3 insertions(+), 3 deletions(-)
> >
> > diff --git a/drivers/staging/comedi/drivers.c
> > b/drivers/staging/comedi/drivers.c
> > index 6e13e45..ce50e85 100644
> > --- a/drivers/staging/comedi/drivers.c
> > +++ b/drivers/staging/comedi/drivers.c
> > @@ -495,9 +495,9 @@ int comedi_buf_alloc(struct comedi_device *dev,
> > struct comedi_subdevice *s,
> > vmap(pages, n_pages, VM_MAP,
> > PAGE_KERNEL_NOCACHE);
> > }
> > - if (pages) {
> > - vfree(pages);
> > - }
> > + vfree(pages);
> > + pages = NULL;
>
> Why the assignment to NULL? It looks redundant to me.
>
> > +
> > if (async->prealloc_buf == NULL) {
> > /* Some allocation failed above. */
> > if (async->buf_page_list) {
> >
> >
> > --
> > To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
> > the body of a message to majordomo@vger.kernel.org
> > More majordomo info at http://vger.kernel.org/majordomo-info.html
> > Please read the FAQ at http://www.tux.org/lkml/
> >
yes, 'pages' is local variable argment,it is no need assignment to NULL.
Best Regards,
Figo.zhang
^ permalink raw reply [flat|nested] 5+ messages in thread
* [PATCH V2] no need for checking it
2009-06-06 10:51 [PATCH] no need for checking it Figo.zhang
2009-06-06 10:56 ` Pekka Enberg
@ 2009-06-06 11:11 ` Figo.zhang
2009-06-06 11:29 ` Pekka Enberg
1 sibling, 1 reply; 5+ messages in thread
From: Figo.zhang @ 2009-06-06 11:11 UTC (permalink / raw)
To: Greg Kroah-Hartman; +Cc: Ian Abbott, Frank Mori Hess, David Schleef, lkml
vfree() does it's own NULL checking,so no need for check before
calling it.
'pages' is local variable argment,so in v2, it is no need assignment
to NULL.
Signed-off-by: Figo.zhang <figo1802@gmail.com>
---
drivers/staging/comedi/drivers.c | 5 ++---
1 files changed, 2 insertions(+), 3 deletions(-)
diff --git a/drivers/staging/comedi/drivers.c b/drivers/staging/comedi/drivers.c
index 6e13e45..587283a 100644
--- a/drivers/staging/comedi/drivers.c
+++ b/drivers/staging/comedi/drivers.c
@@ -495,9 +495,8 @@ int comedi_buf_alloc(struct comedi_device *dev, struct comedi_subdevice *s,
vmap(pages, n_pages, VM_MAP,
PAGE_KERNEL_NOCACHE);
}
- if (pages) {
- vfree(pages);
- }
+ vfree(pages);
+
if (async->prealloc_buf == NULL) {
/* Some allocation failed above. */
if (async->buf_page_list) {
^ permalink raw reply related [flat|nested] 5+ messages in thread* Re: [PATCH V2] no need for checking it
2009-06-06 11:11 ` [PATCH V2] " Figo.zhang
@ 2009-06-06 11:29 ` Pekka Enberg
0 siblings, 0 replies; 5+ messages in thread
From: Pekka Enberg @ 2009-06-06 11:29 UTC (permalink / raw)
To: Figo.zhang
Cc: Greg Kroah-Hartman, Ian Abbott, Frank Mori Hess, David Schleef,
lkml
On Sat, Jun 6, 2009 at 2:11 PM, Figo.zhang <figo1802@gmail.com> wrote:
> vfree() does it's own NULL checking,so no need for check before
> calling it.
>
> 'pages' is local variable argment,so in v2, it is no need assignment
> to NULL.
>
> Signed-off-by: Figo.zhang <figo1802@gmail.com>
Looks good to me.
Acked-by: Pekka Enberg <penberg@cs.helsinki.fi>
^ permalink raw reply [flat|nested] 5+ messages in thread
end of thread, other threads:[~2009-06-06 11:30 UTC | newest]
Thread overview: 5+ messages (download: mbox.gz follow: Atom feed
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2009-06-06 10:51 [PATCH] no need for checking it Figo.zhang
2009-06-06 10:56 ` Pekka Enberg
2009-06-06 11:08 ` Figo.zhang
2009-06-06 11:11 ` [PATCH V2] " Figo.zhang
2009-06-06 11:29 ` Pekka Enberg
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