* [PATCH] drivers: gpu: drm: i915: Replaced calls to kmalloc & memcpy with kmemdup
@ 2013-03-11 20:39 Alexandru Gheorghiu
2013-03-11 21:19 ` Joe Perches
0 siblings, 1 reply; 5+ messages in thread
From: Alexandru Gheorghiu @ 2013-03-11 20:39 UTC (permalink / raw)
To: Daniel Vetter; +Cc: David Airlie, dri-devel, linux-kernel, Alexandru Gheorghiu
Replaced calls to kmalloc followed by memcpy with a single call to kmemdup.
Also removed a now redundant if statement.
Signed-off-by: Alexandru Gheorghiu <gheorghiuandru@gmail.com>
---
drivers/gpu/drm/i915/intel_dp.c | 5 +----
1 file changed, 1 insertion(+), 4 deletions(-)
diff --git a/drivers/gpu/drm/i915/intel_dp.c b/drivers/gpu/drm/i915/intel_dp.c
index f61cb79..3cf8aed 100644
--- a/drivers/gpu/drm/i915/intel_dp.c
+++ b/drivers/gpu/drm/i915/intel_dp.c
@@ -2335,11 +2335,8 @@ intel_dp_get_edid(struct drm_connector *connector, struct i2c_adapter *adapter)
return NULL;
size = (intel_connector->edid->extensions + 1) * EDID_LENGTH;
- edid = kmalloc(size, GFP_KERNEL);
- if (!edid)
- return NULL;
+ edid = kmemdup(intel_connector->edid, size, GFP_KERNEL);
- memcpy(edid, intel_connector->edid, size);
return edid;
}
--
1.7.9.5
^ permalink raw reply related [flat|nested] 5+ messages in thread
* Re: [PATCH] drivers: gpu: drm: i915: Replaced calls to kmalloc & memcpy with kmemdup
2013-03-11 20:39 [PATCH] drivers: gpu: drm: i915: Replaced calls to kmalloc & memcpy with kmemdup Alexandru Gheorghiu
@ 2013-03-11 21:19 ` Joe Perches
0 siblings, 0 replies; 5+ messages in thread
From: Joe Perches @ 2013-03-11 21:19 UTC (permalink / raw)
To: Alexandru Gheorghiu; +Cc: Daniel Vetter, David Airlie, dri-devel, linux-kernel
On Mon, 2013-03-11 at 22:39 +0200, Alexandru Gheorghiu wrote:
> Replaced calls to kmalloc followed by memcpy with a single call to kmemdup.
> Also removed a now redundant if statement.
[]
> diff --git a/drivers/gpu/drm/i915/intel_dp.c b/drivers/gpu/drm/i915/intel_dp.c
[]
> @@ -2335,11 +2335,8 @@ intel_dp_get_edid(struct drm_connector *connector, struct i2c_adapter *adapter)
> return NULL;
>
> size = (intel_connector->edid->extensions + 1) * EDID_LENGTH;
> - edid = kmalloc(size, GFP_KERNEL);
> - if (!edid)
> - return NULL;
> + edid = kmemdup(intel_connector->edid, size, GFP_KERNEL);
>
> - memcpy(edid, intel_connector->edid, size);
> return edid;
> }
>
Might as well get rid of the stack variable edid altogether.
Maybe get rid of size too and use:
if (intel_connector->edid) {
/* invalid edid */
if (IS_ERR(intel_connector->edid))
return NULL;
return kmemdup(intel_connector->edid,
(intel_connector->edid->extensions + 1) * EDID_LENGTH,
GFP_KERNEL);
}
^ permalink raw reply [flat|nested] 5+ messages in thread
* Re: [PATCH] drivers: gpu: drm: i915: Replaced calls to kmalloc & memcpy with kmemdup
2013-03-11 20:25 ` Josh Triplett
@ 2013-03-11 20:31 ` Andru Gheorghiu
0 siblings, 0 replies; 5+ messages in thread
From: Andru Gheorghiu @ 2013-03-11 20:31 UTC (permalink / raw)
To: Josh Triplett; +Cc: Daniel Vetter, linux-kernel, dri-devel
[-- Attachment #1.1: Type: text/plain, Size: 1672 bytes --]
You are right. I shall resend :)
Thanks!
On Mon, Mar 11, 2013 at 10:25 PM, Josh Triplett <josh@joshtriplett.org>wrote:
> On Mon, Mar 11, 2013 at 09:30:40PM +0200, Alexandru Gheorghiu wrote:
> > Replaced calls to kmalloc followed by memcpy with a single call to
> kmemdup.
> > This patch was found using coccinelle.
> >
> > Signed-off-by: Alexandru Gheorghiu <gheorghiuandru@gmail.com>
> > ---
> > drivers/gpu/drm/i915/intel_dp.c | 3 +--
> > 1 file changed, 1 insertion(+), 2 deletions(-)
> >
> > diff --git a/drivers/gpu/drm/i915/intel_dp.c
> b/drivers/gpu/drm/i915/intel_dp.c
> > index f61cb79..a3fdd65 100644
> > --- a/drivers/gpu/drm/i915/intel_dp.c
> > +++ b/drivers/gpu/drm/i915/intel_dp.c
> > @@ -2335,11 +2335,10 @@ intel_dp_get_edid(struct drm_connector
> *connector, struct i2c_adapter *adapter)
> > return NULL;
> >
> > size = (intel_connector->edid->extensions + 1) *
> EDID_LENGTH;
> > - edid = kmalloc(size, GFP_KERNEL);
> > + edid = kmemdup(intel_connector->edid, size, GFP_KERNEL);
> > if (!edid)
> > return NULL;
> >
> > - memcpy(edid, intel_connector->edid, size);
> > return edid;
> > }
>
> With this change, the conditional no longer makes sense; this should
> just "return kmemdup(...);".
>
> That suggests an obvious further cleanup that coccinelle could easily
> handle:
>
> if (!foo)
> return NULL;
> return foo;
>
> should become just "return foo;". And you might then want to check for
> variables used *only* to capture a return value and immediately
> returned, and eliminate them.
>
> - Josh Triplett
>
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^ permalink raw reply [flat|nested] 5+ messages in thread
* Re: [PATCH] drivers: gpu: drm: i915: Replaced calls to kmalloc & memcpy with kmemdup
2013-03-11 19:30 Alexandru Gheorghiu
@ 2013-03-11 20:25 ` Josh Triplett
2013-03-11 20:31 ` Andru Gheorghiu
0 siblings, 1 reply; 5+ messages in thread
From: Josh Triplett @ 2013-03-11 20:25 UTC (permalink / raw)
To: Alexandru Gheorghiu; +Cc: Daniel Vetter, David Airlie, dri-devel, linux-kernel
On Mon, Mar 11, 2013 at 09:30:40PM +0200, Alexandru Gheorghiu wrote:
> Replaced calls to kmalloc followed by memcpy with a single call to kmemdup.
> This patch was found using coccinelle.
>
> Signed-off-by: Alexandru Gheorghiu <gheorghiuandru@gmail.com>
> ---
> drivers/gpu/drm/i915/intel_dp.c | 3 +--
> 1 file changed, 1 insertion(+), 2 deletions(-)
>
> diff --git a/drivers/gpu/drm/i915/intel_dp.c b/drivers/gpu/drm/i915/intel_dp.c
> index f61cb79..a3fdd65 100644
> --- a/drivers/gpu/drm/i915/intel_dp.c
> +++ b/drivers/gpu/drm/i915/intel_dp.c
> @@ -2335,11 +2335,10 @@ intel_dp_get_edid(struct drm_connector *connector, struct i2c_adapter *adapter)
> return NULL;
>
> size = (intel_connector->edid->extensions + 1) * EDID_LENGTH;
> - edid = kmalloc(size, GFP_KERNEL);
> + edid = kmemdup(intel_connector->edid, size, GFP_KERNEL);
> if (!edid)
> return NULL;
>
> - memcpy(edid, intel_connector->edid, size);
> return edid;
> }
With this change, the conditional no longer makes sense; this should
just "return kmemdup(...);".
That suggests an obvious further cleanup that coccinelle could easily
handle:
if (!foo)
return NULL;
return foo;
should become just "return foo;". And you might then want to check for
variables used *only* to capture a return value and immediately
returned, and eliminate them.
- Josh Triplett
^ permalink raw reply [flat|nested] 5+ messages in thread
* [PATCH] drivers: gpu: drm: i915: Replaced calls to kmalloc & memcpy with kmemdup
@ 2013-03-11 19:30 Alexandru Gheorghiu
2013-03-11 20:25 ` Josh Triplett
0 siblings, 1 reply; 5+ messages in thread
From: Alexandru Gheorghiu @ 2013-03-11 19:30 UTC (permalink / raw)
To: Daniel Vetter; +Cc: David Airlie, dri-devel, linux-kernel, Alexandru Gheorghiu
Replaced calls to kmalloc followed by memcpy with a single call to kmemdup.
This patch was found using coccinelle.
Signed-off-by: Alexandru Gheorghiu <gheorghiuandru@gmail.com>
---
drivers/gpu/drm/i915/intel_dp.c | 3 +--
1 file changed, 1 insertion(+), 2 deletions(-)
diff --git a/drivers/gpu/drm/i915/intel_dp.c b/drivers/gpu/drm/i915/intel_dp.c
index f61cb79..a3fdd65 100644
--- a/drivers/gpu/drm/i915/intel_dp.c
+++ b/drivers/gpu/drm/i915/intel_dp.c
@@ -2335,11 +2335,10 @@ intel_dp_get_edid(struct drm_connector *connector, struct i2c_adapter *adapter)
return NULL;
size = (intel_connector->edid->extensions + 1) * EDID_LENGTH;
- edid = kmalloc(size, GFP_KERNEL);
+ edid = kmemdup(intel_connector->edid, size, GFP_KERNEL);
if (!edid)
return NULL;
- memcpy(edid, intel_connector->edid, size);
return edid;
}
--
1.7.9.5
^ permalink raw reply related [flat|nested] 5+ messages in thread
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2013-03-11 20:39 [PATCH] drivers: gpu: drm: i915: Replaced calls to kmalloc & memcpy with kmemdup Alexandru Gheorghiu
2013-03-11 21:19 ` Joe Perches
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2013-03-11 19:30 Alexandru Gheorghiu
2013-03-11 20:25 ` Josh Triplett
2013-03-11 20:31 ` Andru Gheorghiu
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