linux-kernel - Re: [PATCH -tip] x86: amd_iommu

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Message-Id: <1242275822.4574.3.camel@localhost.localdomain>
Date:	Thu, 14 May 2009 10:07:02 +0530
From:	Jaswinder Singh Rajput <jaswinder@...nel.org>
To:	Cyrill Gorcunov <gorcunov@...il.com>
Cc:	Ingo Molnar <mingo@...e.hu>, Joerg Roedel <joerg.roedel@....com>,
	x86 maintainers <x86@...nel.org>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH -tip] x86: amd_iommu_init.c use NULL pointer

On Thu, 2009-05-14 at 07:00 +0400, Cyrill Gorcunov wrote:
> On 5/14/09, Jaswinder Singh Rajput <jaswinder@...nel.org> wrote:
> >
> > Signed-off-by: Jaswinder Singh Rajput <jaswinderrajput@...il.com>
> > ---
> >  arch/x86/kernel/amd_iommu_init.c |    2 +-
> >  1 files changed, 1 insertions(+), 1 deletions(-)
> >
> > diff --git a/arch/x86/kernel/amd_iommu_init.c
> > b/arch/x86/kernel/amd_iommu_init.c
> > index 8c0be09..f728b12 100644
> > --- a/arch/x86/kernel/amd_iommu_init.c
> > +++ b/arch/x86/kernel/amd_iommu_init.c
> > @@ -898,7 +898,7 @@ static int __init init_exclusion_range(struct
> > ivmd_header *m)
> >  /* called for unity map ACPI definition */
> >  static int __init init_unity_map_range(struct ivmd_header *m)
> >  {
> > -	struct unity_map_entry *e = 0;
> > +	struct unity_map_entry *e = NULL;
> >
> >  	e = kzalloc(sizeof(*e), GFP_KERNEL);
> >  	if (e == NULL)
> > --
> > 1.6.0.6
> >
> Hi Jaswinder,
> I believe you could get rid of such init completely. We do check 'e'
> after kzalloc anyway.

Thanks, here is another patch:

[PATCH -tip] x86: amd_iommu_init.c fix initialization issue

struct unity_map_entry *e = 0 which should be struct unity_map_entry *e = NULL

But we do not need to initialize e as kzalloc will take care of it.

Signed-off-by: Jaswinder Singh Rajput <jaswinderrajput@...il.com>
---
 arch/x86/kernel/amd_iommu_init.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)

diff --git a/arch/x86/kernel/amd_iommu_init.c b/arch/x86/kernel/amd_iommu_init.c
index 8c0be09..1ca0383 100644
--- a/arch/x86/kernel/amd_iommu_init.c
+++ b/arch/x86/kernel/amd_iommu_init.c
@@ -898,7 +898,7 @@ static int __init init_exclusion_range(struct ivmd_header *m)
 /* called for unity map ACPI definition */
 static int __init init_unity_map_range(struct ivmd_header *m)
 {
-	struct unity_map_entry *e = 0;
+	struct unity_map_entry *e;
 
 	e = kzalloc(sizeof(*e), GFP_KERNEL);
 	if (e == NULL)
-- 
1.6.0.6



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