[PATCH v2 0/3] drm/amd/powerplay: Fix coccinelle and checkpatch issues

[PATCH v2 0/3] drm/amd/powerplay: Fix coccinelle and checkpatch issues

[Georgiana Chelu]

The first two patches fix coccinelle issues and the last patch fix
a checkpatch issue.

First patch: The return value of kzalloc does not need a cast because
the assignment operator will take care of this.

Second patch: The 'result' variable does not change its value until the
end of the function. Instead of using the variable, return its default value.

Third patch: Placing the constant on the right side will make the code easier
to read, as most of the people read from right to left.

Changes in v2:
* adjusted the subject prefix of the patches
* added the cocci script used to generate the patches

Georgiana Chelu (3):
  drm/amd/powerplay: Don't cast kzalloc() return value
  drm/amd/powerplay: Remove useless variable
  drm/amd/powerplay: Place the constant on the right side of the test

 .../amd/powerplay/hwmgr/vega10_processpptables.c   | 35 ++++++++--------------
 1 file changed, 13 insertions(+), 22 deletions(-)

-- 
2.11.0

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[PATCH v2 1/3] drm/amd/powerplay: Don't cast kzalloc() return value

[Georgiana Chelu]

The kzalloc function returns a void pointer and the assignment
operator converts it to the type of pointer it is assigned to.
Therefore, there is no need to cast.

Issue found by alloc_cast.cocci:
* WARNING: casting value returned by memory allocation function
to <struct type> is useless.

Path to the cocci script: scripts/coccinelle/api/alloc/alloc_cast.cocci

Signed-off-by: Georgiana Chelu <georgiana.chelu93@gmail.com>
---

Changes in v2:
* adjusted the subject prefix of the patches
* added the cocci script used to generate the patches

 .../amd/powerplay/hwmgr/vega10_processpptables.c   | 24 ++++++++--------------
 1 file changed, 8 insertions(+), 16 deletions(-)

diff --git a/drivers/gpu/drm/amd/powerplay/hwmgr/vega10_processpptables.c b/drivers/gpu/drm/amd/powerplay/hwmgr/vega10_processpptables.c
index e343df190375..d968c3834481 100644
--- a/drivers/gpu/drm/amd/powerplay/hwmgr/vega10_processpptables.c
+++ b/drivers/gpu/drm/amd/powerplay/hwmgr/vega10_processpptables.c
@@ -291,8 +291,7 @@ static int get_mm_clock_voltage_table(
 	table_size = sizeof(uint32_t) +
 			sizeof(phm_ppt_v1_mm_clock_voltage_dependency_record) *
 			mm_dependency_table->ucNumEntries;
-	mm_table = (phm_ppt_v1_mm_clock_voltage_dependency_table *)
-			kzalloc(table_size, GFP_KERNEL);
+	mm_table = kzalloc(table_size, GFP_KERNEL);
 
 	if (!mm_table)
 		return -ENOMEM;
@@ -519,8 +518,7 @@ static int get_socclk_voltage_dependency_table(
 			sizeof(phm_ppt_v1_clock_voltage_dependency_record) *
 			clk_dep_table->ucNumEntries;
 
-	clk_table = (phm_ppt_v1_clock_voltage_dependency_table *)
-			kzalloc(table_size, GFP_KERNEL);
+	clk_table = kzalloc(table_size, GFP_KERNEL);
 
 	if (!clk_table)
 		return -ENOMEM;
@@ -554,8 +552,7 @@ static int get_mclk_voltage_dependency_table(
 			sizeof(phm_ppt_v1_clock_voltage_dependency_record) *
 			mclk_dep_table->ucNumEntries;
 
-	mclk_table = (phm_ppt_v1_clock_voltage_dependency_table *)
-			kzalloc(table_size, GFP_KERNEL);
+	mclk_table = kzalloc(table_size, GFP_KERNEL);
 
 	if (!mclk_table)
 		return -ENOMEM;
@@ -596,8 +593,7 @@ static int get_gfxclk_voltage_dependency_table(
 			sizeof(phm_ppt_v1_clock_voltage_dependency_record) *
 			clk_dep_table->ucNumEntries;
 
-	clk_table = (struct phm_ppt_v1_clock_voltage_dependency_table *)
-			kzalloc(table_size, GFP_KERNEL);
+	clk_table = kzalloc(table_size, GFP_KERNEL);
 
 	if (!clk_table)
 		return -ENOMEM;
@@ -663,8 +659,7 @@ static int get_pix_clk_voltage_dependency_table(
 			sizeof(phm_ppt_v1_clock_voltage_dependency_record) *
 			clk_dep_table->ucNumEntries;
 
-	clk_table = (struct phm_ppt_v1_clock_voltage_dependency_table *)
-			kzalloc(table_size, GFP_KERNEL);
+	clk_table = kzalloc(table_size, GFP_KERNEL);
 
 	if (!clk_table)
 		return -ENOMEM;
@@ -728,8 +723,7 @@ static int get_dcefclk_voltage_dependency_table(
 			sizeof(phm_ppt_v1_clock_voltage_dependency_record) *
 			num_entries;
 
-	clk_table = (struct phm_ppt_v1_clock_voltage_dependency_table *)
-			kzalloc(table_size, GFP_KERNEL);
+	clk_table = kzalloc(table_size, GFP_KERNEL);
 
 	if (!clk_table)
 		return -ENOMEM;
@@ -772,8 +766,7 @@ static int get_pcie_table(struct pp_hwmgr *hwmgr,
 			sizeof(struct phm_ppt_v1_pcie_record) *
 			atom_pcie_table->ucNumEntries;
 
-	pcie_table = (struct phm_ppt_v1_pcie_table *)
-			kzalloc(table_size, GFP_KERNEL);
+	pcie_table = kzalloc(table_size, GFP_KERNEL);
 
 	if (!pcie_table)
 		return -ENOMEM;
@@ -1026,8 +1019,7 @@ static int get_vddc_lookup_table(
 	table_size = sizeof(uint32_t) +
 			sizeof(phm_ppt_v1_voltage_lookup_record) * max_levels;
 
-	table = (phm_ppt_v1_voltage_lookup_table *)
-			kzalloc(table_size, GFP_KERNEL);
+	table = kzalloc(table_size, GFP_KERNEL);
 
 	if (NULL == table)
 		return -ENOMEM;
-- 
2.11.0

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[PATCH v2 2/3] drm/amd/powerplay: Remove useless variable

[Georgiana Chelu]

The result variable is initialized at the beginning of the function, but
its value does not change during the function execution. Thus, remove the
variable and return the SUCCESS value, which is 0.

Issue found by coccinelle script:
* Unneeded variable: "result". Return "0"

Path to the cocci script: scripts/coccinelle/misc/returnvar.cocci

Signed-off-by: Georgiana Chelu <georgiana.chelu93@gmail.com>
---

Changes in v2:
* adjusted the subject prefix of the patches
* added the cocci script used to generate the patches

 drivers/gpu/drm/amd/powerplay/hwmgr/vega10_processpptables.c | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/drivers/gpu/drm/amd/powerplay/hwmgr/vega10_processpptables.c b/drivers/gpu/drm/amd/powerplay/hwmgr/vega10_processpptables.c
index d968c3834481..769ac11a9215 100644
--- a/drivers/gpu/drm/amd/powerplay/hwmgr/vega10_processpptables.c
+++ b/drivers/gpu/drm/amd/powerplay/hwmgr/vega10_processpptables.c
@@ -1174,7 +1174,6 @@ int vega10_pp_tables_initialize(struct pp_hwmgr *hwmgr)
 
 static int vega10_pp_tables_uninitialize(struct pp_hwmgr *hwmgr)
 {
-	int result = 0;
 	struct phm_ppt_v2_information *pp_table_info =
 			(struct phm_ppt_v2_information *)(hwmgr->pptable);
 
@@ -1217,7 +1216,7 @@ static int vega10_pp_tables_uninitialize(struct pp_hwmgr *hwmgr)
 	kfree(hwmgr->pptable);
 	hwmgr->pptable = NULL;
 
-	return result;
+	return 0;
 }
 
 const struct pp_table_func vega10_pptable_funcs = {
-- 
2.11.0

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[PATCH v2 3/3] drm/amd/powerplay: Place the constant on the right side of the test

[Georgiana Chelu]

Move the constant on the right side of the comparison in order to
make the code easier to read.

Issue found by checkpatch script:
* WARNING: Comparisons should place the constant on the right side of
the test

Signed-off-by: Georgiana Chelu <georgiana.chelu93@gmail.com>
---

Changes in v2:
* adjusted the subject prefix of the patches

 drivers/gpu/drm/amd/powerplay/hwmgr/vega10_processpptables.c | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/drivers/gpu/drm/amd/powerplay/hwmgr/vega10_processpptables.c b/drivers/gpu/drm/amd/powerplay/hwmgr/vega10_processpptables.c
index 769ac11a9215..f14c7611fad3 100644
--- a/drivers/gpu/drm/amd/powerplay/hwmgr/vega10_processpptables.c
+++ b/drivers/gpu/drm/amd/powerplay/hwmgr/vega10_processpptables.c
@@ -1021,7 +1021,7 @@ static int get_vddc_lookup_table(
 
 	table = kzalloc(table_size, GFP_KERNEL);
 
-	if (NULL == table)
+	if (table == NULL)
 		return -ENOMEM;
 
 	table->count = vddc_lookup_pp_tables->ucNumEntries;
@@ -1130,12 +1130,12 @@ int vega10_pp_tables_initialize(struct pp_hwmgr *hwmgr)
 
 	hwmgr->pptable = kzalloc(sizeof(struct phm_ppt_v2_information), GFP_KERNEL);
 
-	PP_ASSERT_WITH_CODE((NULL != hwmgr->pptable),
+	PP_ASSERT_WITH_CODE((hwmgr->pptable != NULL),
 			    "Failed to allocate hwmgr->pptable!", return -ENOMEM);
 
 	powerplay_table = get_powerplay_table(hwmgr);
 
-	PP_ASSERT_WITH_CODE((NULL != powerplay_table),
+	PP_ASSERT_WITH_CODE((powerplay_table != NULL),
 		"Missing PowerPlay Table!", return -1);
 
 	result = check_powerplay_tables(hwmgr, powerplay_table);
@@ -1229,7 +1229,7 @@ int vega10_get_number_of_powerplay_table_entries(struct pp_hwmgr *hwmgr)
 	const ATOM_Vega10_State_Array *state_arrays;
 	const ATOM_Vega10_POWERPLAYTABLE *pp_table = get_powerplay_table(hwmgr);
 
-	PP_ASSERT_WITH_CODE((NULL != pp_table),
+	PP_ASSERT_WITH_CODE((pp_table != NULL),
 			"Missing PowerPlay Table!", return -1);
 	PP_ASSERT_WITH_CODE((pp_table->sHeader.format_revision >=
 			ATOM_Vega10_TABLE_REVISION_VEGA10),
-- 
2.11.0

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Re: [PATCH v2 3/3] drm/amd/powerplay: Place the constant on the right side of the test

[Alex Deucher]

On Tue, Oct 17, 2017 at 4:22 PM, Georgiana Chelu
<georgiana.chelu93@gmail.com> wrote:
> Move the constant on the right side of the comparison in order to
> make the code easier to read.
>
> Issue found by checkpatch script:
> * WARNING: Comparisons should place the constant on the right side of
> the test
>
> Signed-off-by: Georgiana Chelu <georgiana.chelu93@gmail.com>

Applied the series.  Thanks you!

Alex

> ---
>
> Changes in v2:
> * adjusted the subject prefix of the patches
>
>  drivers/gpu/drm/amd/powerplay/hwmgr/vega10_processpptables.c | 8 ++++----
>  1 file changed, 4 insertions(+), 4 deletions(-)
>
> diff --git a/drivers/gpu/drm/amd/powerplay/hwmgr/vega10_processpptables.c b/drivers/gpu/drm/amd/powerplay/hwmgr/vega10_processpptables.c
> index 769ac11a9215..f14c7611fad3 100644
> --- a/drivers/gpu/drm/amd/powerplay/hwmgr/vega10_processpptables.c
> +++ b/drivers/gpu/drm/amd/powerplay/hwmgr/vega10_processpptables.c
> @@ -1021,7 +1021,7 @@ static int get_vddc_lookup_table(
>
>         table = kzalloc(table_size, GFP_KERNEL);
>
> -       if (NULL == table)
> +       if (table == NULL)
>                 return -ENOMEM;
>
>         table->count = vddc_lookup_pp_tables->ucNumEntries;
> @@ -1130,12 +1130,12 @@ int vega10_pp_tables_initialize(struct pp_hwmgr *hwmgr)
>
>         hwmgr->pptable = kzalloc(sizeof(struct phm_ppt_v2_information), GFP_KERNEL);
>
> -       PP_ASSERT_WITH_CODE((NULL != hwmgr->pptable),
> +       PP_ASSERT_WITH_CODE((hwmgr->pptable != NULL),
>                             "Failed to allocate hwmgr->pptable!", return -ENOMEM);
>
>         powerplay_table = get_powerplay_table(hwmgr);
>
> -       PP_ASSERT_WITH_CODE((NULL != powerplay_table),
> +       PP_ASSERT_WITH_CODE((powerplay_table != NULL),
>                 "Missing PowerPlay Table!", return -1);
>
>         result = check_powerplay_tables(hwmgr, powerplay_table);
> @@ -1229,7 +1229,7 @@ int vega10_get_number_of_powerplay_table_entries(struct pp_hwmgr *hwmgr)
>         const ATOM_Vega10_State_Array *state_arrays;
>         const ATOM_Vega10_POWERPLAYTABLE *pp_table = get_powerplay_table(hwmgr);
>
> -       PP_ASSERT_WITH_CODE((NULL != pp_table),
> +       PP_ASSERT_WITH_CODE((pp_table != NULL),
>                         "Missing PowerPlay Table!", return -1);
>         PP_ASSERT_WITH_CODE((pp_table->sHeader.format_revision >=
>                         ATOM_Vega10_TABLE_REVISION_VEGA10),
> --
> 2.11.0
>
> _______________________________________________
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> dri-devel@lists.freedesktop.org
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