Re: [PATCH v2] ACPI: Fix acpi_evaluate_object() return value check

[Hanjun Guo <hanjun.guo@linaro.org>]

On 2014-1-17 9:29, Yijing Wang wrote:
> Fix acpi_evaluate_object() return value check,
> shoud acpi_status not int.
> 
> Signed-off-by: Yijing Wang <wangyijing@huawei.com>
> ---
> 
> v1->v2: Add CC to the related subsystem MAINTAINERS.
> 
> ---
>  drivers/gpu/drm/i915/intel_acpi.c              |   13 +++++++------
>  drivers/gpu/drm/nouveau/core/subdev/mxm/base.c |    6 +++---
>  drivers/gpu/drm/nouveau/nouveau_acpi.c         |   13 +++++++------
>  drivers/pci/pci-label.c                        |    6 +++---
>  4 files changed, 20 insertions(+), 18 deletions(-)
> 
> diff --git a/drivers/gpu/drm/i915/intel_acpi.c b/drivers/gpu/drm/i915/intel_acpi.c
> index dfff090..7ea00e5 100644
> --- a/drivers/gpu/drm/i915/intel_acpi.c
> +++ b/drivers/gpu/drm/i915/intel_acpi.c
> @@ -35,7 +35,7 @@ static int intel_dsm(acpi_handle handle, int func)
>  	union acpi_object params[4];
>  	union acpi_object *obj;
>  	u32 result;
> -	int ret = 0;

The 'ret' is removed, but

> +	acpi_status status;
>  
>  	input.count = 4;
>  	input.pointer = params;
> @@ -50,8 +50,8 @@ static int intel_dsm(acpi_handle handle, int func)
>  	params[3].package.count = 0;
>  	params[3].package.elements = NULL;
>  
> -	ret = acpi_evaluate_object(handle, "_DSM", &input, &output);
> -	if (ret) {
> +	status = acpi_evaluate_object(handle, "_DSM", &input, &output);
> +	if (ACPI_FAILURE(status)) {
>  		DRM_DEBUG_DRIVER("failed to evaluate _DSM: %d\n", ret);
>  		return ret;

you still use it here, so you should -EINVAL or something else here.

>  	}
> @@ -141,7 +141,8 @@ static void intel_dsm_platform_mux_info(void)
>  	struct acpi_object_list input;
>  	union acpi_object params[4];
>  	union acpi_object *pkg;
> -	int i, ret;
> +	acpi_status status;
> +	int i;
>  
>  	input.count = 4;
>  	input.pointer = params;
> @@ -156,9 +157,9 @@ static void intel_dsm_platform_mux_info(void)
>  	params[3].package.count = 0;
>  	params[3].package.elements = NULL;
>  
> -	ret = acpi_evaluate_object(intel_dsm_priv.dhandle, "_DSM", &input,
> +	acpi_status = acpi_evaluate_object(intel_dsm_priv.dhandle, "_DSM", &input,
>  				   &output);
> -	if (ret) {
> +	if (ACPI_FAILURE(status)) {
>  		DRM_DEBUG_DRIVER("failed to evaluate _DSM: %d\n", ret);
>  		goto out;
>  	}
> diff --git a/drivers/gpu/drm/nouveau/core/subdev/mxm/base.c b/drivers/gpu/drm/nouveau/core/subdev/mxm/base.c
> index 1291204..3920943 100644
> --- a/drivers/gpu/drm/nouveau/core/subdev/mxm/base.c
> +++ b/drivers/gpu/drm/nouveau/core/subdev/mxm/base.c
> @@ -114,14 +114,14 @@ mxm_shadow_dsm(struct nouveau_mxm *mxm, u8 version)
>  	struct acpi_buffer retn = { ACPI_ALLOCATE_BUFFER, NULL };
>  	union acpi_object *obj;
>  	acpi_handle handle;
> -	int ret;
> +	acpi_status status;
>  
>  	handle = ACPI_HANDLE(&device->pdev->dev);
>  	if (!handle)
>  		return false;
>  
> -	ret = acpi_evaluate_object(handle, "_DSM", &list, &retn);
> -	if (ret) {
> +	status = acpi_evaluate_object(handle, "_DSM", &list, &retn);
> +	if (ACPI_FAILURE(status)) {
>  		nv_debug(mxm, "DSM MXMS failed: %d\n", ret);
>  		return false;
>  	}
> diff --git a/drivers/gpu/drm/nouveau/nouveau_acpi.c b/drivers/gpu/drm/nouveau/nouveau_acpi.c
> index ba0183f..6f810f2 100644
> --- a/drivers/gpu/drm/nouveau/nouveau_acpi.c
> +++ b/drivers/gpu/drm/nouveau/nouveau_acpi.c
> @@ -82,7 +82,8 @@ static int nouveau_optimus_dsm(acpi_handle handle, int func, int arg, uint32_t *
>  	struct acpi_object_list input;
>  	union acpi_object params[4];
>  	union acpi_object *obj;
> -	int i, err;
> +	acpi_status status;
> +	int i;
>  	char args_buff[4];
>  
>  	input.count = 4;
> @@ -101,8 +102,8 @@ static int nouveau_optimus_dsm(acpi_handle handle, int func, int arg, uint32_t *
>  		args_buff[i] = (arg >> i * 8) & 0xFF;
>  	params[3].buffer.pointer = args_buff;
>  
> -	err = acpi_evaluate_object(handle, "_DSM", &input, &output);
> -	if (err) {
> +	status = acpi_evaluate_object(handle, "_DSM", &input, &output);
> +	if (ACPI_FAILURE(status)) {
>  		printk(KERN_INFO "failed to evaluate _DSM: %d\n", err);
>  		return err;

here too.

>  	}
> @@ -134,7 +135,7 @@ static int nouveau_dsm(acpi_handle handle, int func, int arg, uint32_t *result)
>  	struct acpi_object_list input;
>  	union acpi_object params[4];
>  	union acpi_object *obj;
> -	int err;
> +	acpi_status status;
>  
>  	input.count = 4;
>  	input.pointer = params;
> @@ -148,8 +149,8 @@ static int nouveau_dsm(acpi_handle handle, int func, int arg, uint32_t *result)
>  	params[3].type = ACPI_TYPE_INTEGER;
>  	params[3].integer.value = arg;
>  
> -	err = acpi_evaluate_object(handle, "_DSM", &input, &output);
> -	if (err) {
> +	status = acpi_evaluate_object(handle, "_DSM", &input, &output);
> +	if (ACPI_FAILURE(status)) {
>  		printk(KERN_INFO "failed to evaluate _DSM: %d\n", err);
>  		return err;

and here.

>  	}
> diff --git a/drivers/pci/pci-label.c b/drivers/pci/pci-label.c
> index d51f45a..3c21f1b 100644
> --- a/drivers/pci/pci-label.c
> +++ b/drivers/pci/pci-label.c
> @@ -213,7 +213,7 @@ dsm_get_label(acpi_handle handle, int func,
>  	union acpi_object *obj;
>  	int len = 0;
>  
> -	int err;
> +	acpi_status status;
>  
>  	input.count = 4;
>  	input.pointer = params;
> @@ -228,8 +228,8 @@ dsm_get_label(acpi_handle handle, int func,
>  	params[3].package.count = 0;
>  	params[3].package.elements = NULL;
>  
> -	err = acpi_evaluate_object(handle, "_DSM", &input, output);
> -	if (err)
> +	status = acpi_evaluate_object(handle, "_DSM", &input, output);
> +	if (ACPI_FAILURE(status))
>  		return -1;

can we return specific error such as -EINVAL instead of hard code?

Thanks
Hanjun