linux-kernel - [PATCH v2 08/35] drm/i915: Use kmemdup rather than duplicating its implementation

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Date:   Thu,  4 Jul 2019 00:27:28 +0800
From:   Fuqian Huang <huangfq.daxian@...il.com>
To:     unlisted-recipients:; (no To-header on input)
Cc:     Zhenyu Wang <zhenyuw@...ux.intel.com>,
        Zhi Wang <zhi.a.wang@...el.com>,
        Jani Nikula <jani.nikula@...ux.intel.com>,
        Joonas Lahtinen <joonas.lahtinen@...ux.intel.com>,
        Rodrigo Vivi <rodrigo.vivi@...el.com>,
        David Airlie <airlied@...ux.ie>,
        Daniel Vetter <daniel@...ll.ch>,
        intel-gvt-dev@...ts.freedesktop.org,
        intel-gfx@...ts.freedesktop.org, dri-devel@...ts.freedesktop.org,
        linux-kernel@...r.kernel.org,
        Fuqian Huang <huangfq.daxian@...il.com>
Subject: [PATCH v2 08/35] drm/i915: Use kmemdup rather than duplicating its implementation

kmemdup is introduced to duplicate a region of memory in a neat way.
Rather than kmalloc/kzalloc + memcpy, which the programmer needs to
write the size twice (sometimes lead to mistakes), kmemdup improves
readability, leads to smaller code and also reduce the chances of mistakes.
Suggestion to use kmemdup rather than using kmalloc/kzalloc + memcpy.

Signed-off-by: Fuqian Huang <huangfq.daxian@...il.com>
---
Changes in v2:
  - Fix a typo in commit message (memset -> memcpy)

 drivers/gpu/drm/i915/gvt/dmabuf.c | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/drivers/gpu/drm/i915/gvt/dmabuf.c b/drivers/gpu/drm/i915/gvt/dmabuf.c
index 41c8ebc60c63..fe6fa979f22a 100644
--- a/drivers/gpu/drm/i915/gvt/dmabuf.c
+++ b/drivers/gpu/drm/i915/gvt/dmabuf.c
@@ -411,14 +411,13 @@ int intel_vgpu_query_plane(struct intel_vgpu *vgpu, void *args)
 		goto out;
 	}
 
-	dmabuf_obj->info = kmalloc(sizeof(struct intel_vgpu_fb_info),
+	dmabuf_obj->info = kmemdup(&fb_info, sizeof(struct intel_vgpu_fb_info),
 				   GFP_KERNEL);
 	if (unlikely(!dmabuf_obj->info)) {
 		gvt_vgpu_err("allocate intel vgpu fb info failed\n");
 		ret = -ENOMEM;
 		goto out_free_dmabuf;
 	}
-	memcpy(dmabuf_obj->info, &fb_info, sizeof(struct intel_vgpu_fb_info));
 
 	((struct intel_vgpu_fb_info *)dmabuf_obj->info)->obj = dmabuf_obj;
 
-- 
2.11.0