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SubjectRe: [PATCH] no need for checking it
From
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) {
>
>
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