* [PATCH v2] perf: xgene: Use device_get_match_data() to simplify code
@ 2021-04-02 1:10 Tian Tao
2021-04-07 12:18 ` Will Deacon
0 siblings, 1 reply; 2+ messages in thread
From: Tian Tao @ 2021-04-02 1:10 UTC (permalink / raw)
To: will, mark.rutland; +Cc: linux-arm-kernel
Use device_get_match_data() here to simplify the code a bit.
Signed-off-by: Tian Tao <tiantao6@hisilicon.com>
---
v2:handled the case which device_get_match_data() return NULL.
---
drivers/perf/xgene_pmu.c | 18 ++----------------
1 file changed, 2 insertions(+), 16 deletions(-)
diff --git a/drivers/perf/xgene_pmu.c b/drivers/perf/xgene_pmu.c
index ffe3bde..45f36c1 100644
--- a/drivers/perf/xgene_pmu.c
+++ b/drivers/perf/xgene_pmu.c
@@ -1836,7 +1836,6 @@ static int xgene_pmu_offline_cpu(unsigned int cpu, struct hlist_node *node)
static int xgene_pmu_probe(struct platform_device *pdev)
{
const struct xgene_pmu_data *dev_data;
- const struct of_device_id *of_id;
struct xgene_pmu *xgene_pmu;
struct resource *res;
int irq, rc;
@@ -1856,22 +1855,9 @@ static int xgene_pmu_probe(struct platform_device *pdev)
xgene_pmu->dev = &pdev->dev;
platform_set_drvdata(pdev, xgene_pmu);
- version = -EINVAL;
- of_id = of_match_device(xgene_pmu_of_match, &pdev->dev);
- if (of_id) {
- dev_data = (const struct xgene_pmu_data *) of_id->data;
- version = dev_data->id;
- }
-
-#ifdef CONFIG_ACPI
- if (ACPI_COMPANION(&pdev->dev)) {
- const struct acpi_device_id *acpi_id;
+ dev_data = device_get_match_data(&pdev->dev);
- acpi_id = acpi_match_device(xgene_pmu_acpi_match, &pdev->dev);
- if (acpi_id)
- version = (int) acpi_id->driver_data;
- }
-#endif
+ version = dev_data ? dev_data->id : -EINVAL;
if (version < 0)
return -ENODEV;
--
2.7.4
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* Re: [PATCH v2] perf: xgene: Use device_get_match_data() to simplify code
2021-04-02 1:10 [PATCH v2] perf: xgene: Use device_get_match_data() to simplify code Tian Tao
@ 2021-04-07 12:18 ` Will Deacon
0 siblings, 0 replies; 2+ messages in thread
From: Will Deacon @ 2021-04-07 12:18 UTC (permalink / raw)
To: Tian Tao; +Cc: mark.rutland, linux-arm-kernel
On Fri, Apr 02, 2021 at 09:10:38AM +0800, Tian Tao wrote:
> Use device_get_match_data() here to simplify the code a bit.
>
> Signed-off-by: Tian Tao <tiantao6@hisilicon.com>
> ---
> v2:handled the case which device_get_match_data() return NULL.
> ---
> drivers/perf/xgene_pmu.c | 18 ++----------------
> 1 file changed, 2 insertions(+), 16 deletions(-)
>
> diff --git a/drivers/perf/xgene_pmu.c b/drivers/perf/xgene_pmu.c
> index ffe3bde..45f36c1 100644
> --- a/drivers/perf/xgene_pmu.c
> +++ b/drivers/perf/xgene_pmu.c
> @@ -1836,7 +1836,6 @@ static int xgene_pmu_offline_cpu(unsigned int cpu, struct hlist_node *node)
> static int xgene_pmu_probe(struct platform_device *pdev)
> {
> const struct xgene_pmu_data *dev_data;
> - const struct of_device_id *of_id;
> struct xgene_pmu *xgene_pmu;
> struct resource *res;
> int irq, rc;
> @@ -1856,22 +1855,9 @@ static int xgene_pmu_probe(struct platform_device *pdev)
> xgene_pmu->dev = &pdev->dev;
> platform_set_drvdata(pdev, xgene_pmu);
>
> - version = -EINVAL;
> - of_id = of_match_device(xgene_pmu_of_match, &pdev->dev);
> - if (of_id) {
> - dev_data = (const struct xgene_pmu_data *) of_id->data;
> - version = dev_data->id;
> - }
> -
> -#ifdef CONFIG_ACPI
> - if (ACPI_COMPANION(&pdev->dev)) {
> - const struct acpi_device_id *acpi_id;
> + dev_data = device_get_match_data(&pdev->dev);
>
> - acpi_id = acpi_match_device(xgene_pmu_acpi_match, &pdev->dev);
> - if (acpi_id)
> - version = (int) acpi_id->driver_data;
> - }
> -#endif
> + version = dev_data ? dev_data->id : -EINVAL;
> if (version < 0)
> return -ENODEV;
Hmm, looking at this again, are you sure this is right?
When ACPI is being used, the version is encoded directly in the driver_data
pointer of the acpi_device_id structure, yet you seem to dereference that
unconditionally here. How are you testing your patch?
Will
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