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From 1323b9f9d3eb1a214da24baf9b3fe3b76acff1c5 Mon Sep 17 00:00:00 2001
From: Fuqian Huang <huangfq.daxian@gmail.com>
Date: Thu, 4 Jul 2019 00:27:18 +0800
Subject: [PATCH 2676/2940] drm/amdgpu: Use kmemdup rather than duplicating its
implementation
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit
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.
Reviewed-by: Christian König <Christian.Koenig@amd.com>
Reviewed-by: Emil Velikov <emil.velikov@collabora.com>
Signed-off-by: Fuqian Huang <huangfq.daxian@gmail.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
---
drivers/gpu/drm/amd/amdgpu/gfx_v8_0.c | 5 ++---
drivers/gpu/drm/amd/amdgpu/gfx_v9_0.c | 5 ++---
drivers/gpu/drm/amd/display/dc/core/dc.c | 6 ++----
drivers/gpu/drm/amd/display/dc/core/dc_stream.c | 4 +---
4 files changed, 7 insertions(+), 13 deletions(-)
diff --git a/drivers/gpu/drm/amd/amdgpu/gfx_v8_0.c b/drivers/gpu/drm/amd/amdgpu/gfx_v8_0.c
index 792aeb1b9e33..f84366f20dff 100644
--- a/drivers/gpu/drm/amd/amdgpu/gfx_v8_0.c
+++ b/drivers/gpu/drm/amd/amdgpu/gfx_v8_0.c
@@ -3921,11 +3921,10 @@ static int gfx_v8_0_init_save_restore_list(struct amdgpu_device *adev)
int list_size;
unsigned int *register_list_format =
- kmalloc(adev->gfx.rlc.reg_list_format_size_bytes, GFP_KERNEL);
+ kmemdup(adev->gfx.rlc.register_list_format,
+ adev->gfx.rlc.reg_list_format_size_bytes, GFP_KERNEL);
if (!register_list_format)
return -ENOMEM;
- memcpy(register_list_format, adev->gfx.rlc.register_list_format,
- adev->gfx.rlc.reg_list_format_size_bytes);
gfx_v8_0_parse_ind_reg_list(register_list_format,
RLC_FormatDirectRegListLength,
diff --git a/drivers/gpu/drm/amd/amdgpu/gfx_v9_0.c b/drivers/gpu/drm/amd/amdgpu/gfx_v9_0.c
index 00617a655e8a..550bd70b2edb 100644
--- a/drivers/gpu/drm/amd/amdgpu/gfx_v9_0.c
+++ b/drivers/gpu/drm/amd/amdgpu/gfx_v9_0.c
@@ -2074,11 +2074,10 @@ static int gfx_v9_1_init_rlc_save_restore_list(struct amdgpu_device *adev)
u32 tmp = 0;
u32 *register_list_format =
- kmalloc(adev->gfx.rlc.reg_list_format_size_bytes, GFP_KERNEL);
+ kmemdup(adev->gfx.rlc.register_list_format,
+ adev->gfx.rlc.reg_list_format_size_bytes, GFP_KERNEL);
if (!register_list_format)
return -ENOMEM;
- memcpy(register_list_format, adev->gfx.rlc.register_list_format,
- adev->gfx.rlc.reg_list_format_size_bytes);
/* setup unique_indirect_regs array and indirect_start_offsets array */
unique_indirect_reg_count = ARRAY_SIZE(unique_indirect_regs);
diff --git a/drivers/gpu/drm/amd/display/dc/core/dc.c b/drivers/gpu/drm/amd/display/dc/core/dc.c
index 251c24a99e4e..c1bda186fd40 100644
--- a/drivers/gpu/drm/amd/display/dc/core/dc.c
+++ b/drivers/gpu/drm/amd/display/dc/core/dc.c
@@ -1200,14 +1200,12 @@ struct dc_state *dc_create_state(struct dc *dc)
struct dc_state *dc_copy_state(struct dc_state *src_ctx)
{
int i, j;
- struct dc_state *new_ctx = kzalloc(sizeof(struct dc_state),
- GFP_KERNEL);
+ struct dc_state *new_ctx = kmemdup(src_ctx,
+ sizeof(struct dc_state), GFP_KERNEL);
if (!new_ctx)
return NULL;
- memcpy(new_ctx, src_ctx, sizeof(struct dc_state));
-
for (i = 0; i < MAX_PIPES; i++) {
struct pipe_ctx *cur_pipe = &new_ctx->res_ctx.pipe_ctx[i];
diff --git a/drivers/gpu/drm/amd/display/dc/core/dc_stream.c b/drivers/gpu/drm/amd/display/dc/core/dc_stream.c
index 30a25e694da0..1bc19d42fc9f 100644
--- a/drivers/gpu/drm/amd/display/dc/core/dc_stream.c
+++ b/drivers/gpu/drm/amd/display/dc/core/dc_stream.c
@@ -178,12 +178,10 @@ struct dc_stream_state *dc_copy_stream(const struct dc_stream_state *stream)
{
struct dc_stream_state *new_stream;
- new_stream = kzalloc(sizeof(struct dc_stream_state), GFP_KERNEL);
+ new_stream = kmemdup(stream, sizeof(struct dc_stream_state), GFP_KERNEL);
if (!new_stream)
return NULL;
- memcpy(new_stream, stream, sizeof(struct dc_stream_state));
-
if (new_stream->sink)
dc_sink_retain(new_stream->sink);
--
2.17.1
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