Re: [PATCH 8/8] acpi: Use booleans when probing different _DSM types

[Pierre Moreau <pierre.morrow@xxxxxxx>]

I'm thinking of re-writing this patch to just OR the different returned retval and test for individual bits directly in the final conditionals.
So this would give something like:


int retval = 0;

while ((pdev = pci_get_class(PCI_CLASS_DISPLAY_VGA << 8, pdev)) != NULL) {
	vga_count++;
	retval |= nouveau_dsm_pci_probe(pdev);
}
while ((pdev = pci_get_class(PCI_CLASS_DISPLAY_3D << 8, pdev)) != NULL) {
	vga_count++;
	retval |= nouveau_dsm_pci_probe(pdev);
}

if (retval & NOUVEAU_DSM_HAS_OPT) {
	acpi_get_name(nouveau_dsm_priv.dhandle, ACPI_FULL_PATHNAME,
		&buffer);
	printk(KERN_INFO "VGA switcheroo: detected Optimus DSM method %s handle\n",
		acpi_method_name);
	nouveau_dsm_priv.optimus_detected = true;
	ret = true;
} else if (vga_count == 2 && (retval & NOUVEAU_DSM_HAS_MUX) && guid_valid) {
	acpi_get_name(nouveau_dsm_priv.dhandle, ACPI_FULL_PATHNAME,
		&buffer);
	printk(KERN_INFO "VGA switcheroo: detected mux DSM switching method %s handle\n",
		acpi_method_name);
	nouveau_dsm_priv.mux_detected = true;
	ret = true;
} else if (retval & NOUVEAU_DSM_HAS_GMUX) {
	acpi_get_name(nouveau_dsm_priv.dhandle, ACPI_FULL_PATHNAME,
		&buffer);
	printk(KERN_INFO "VGA switcheroo: detected gmux DSM switching method %s handle\n",
		acpi_method_name);
	nouveau_dsm_priv.gmux_detected = true;
	ret = true;
}


Any opinions on this?

Pierre

----- Mail original -----
> Signed-off-by: Pierre Moreau <pierre.morrow@xxxxxxx>
> ---
>  drm/nouveau/nouveau_acpi.c | 14 +++++++-------
>  1 file changed, 7 insertions(+), 7 deletions(-)
> 
> diff --git a/drm/nouveau/nouveau_acpi.c b/drm/nouveau/nouveau_acpi.c
> index 3d6a1ea..5d63621 100644
> --- a/drm/nouveau/nouveau_acpi.c
> +++ b/drm/nouveau/nouveau_acpi.c
> @@ -297,8 +297,8 @@ static bool nouveau_dsm_detect(void)
>  	char acpi_method_name[255] = { 0 };
>  	struct acpi_buffer buffer = {sizeof(acpi_method_name),
>  	acpi_method_name};
>  	struct pci_dev *pdev = NULL;
> -	int has_dsm = 0;
> -	int has_optimus = 0;
> +	bool has_mux = false;
> +	bool has_optimus = false;
>  	bool has_gmux = false;
>  	int vga_count = 0;
>  	bool guid_valid;
> @@ -317,9 +317,9 @@ static bool nouveau_dsm_detect(void)
>  
>  		retval = nouveau_dsm_pci_probe(pdev);
>  		if (retval & NOUVEAU_DSM_HAS_MUX)
> -			has_dsm |= 1;
> +			has_mux = true;
>  		if (retval & NOUVEAU_DSM_HAS_OPT)
> -			has_optimus = 1;
> +			has_optimus = true;
>  		if (retval & NOUVEAU_DSM_HAS_GMUX)
>  			has_gmux = true;
>  	}
> @@ -329,9 +329,9 @@ static bool nouveau_dsm_detect(void)
>  
>  		retval = nouveau_dsm_pci_probe(pdev);
>  		if (retval & NOUVEAU_DSM_HAS_MUX)
> -			has_dsm |= 1;
> +			has_mux = true;
>  		if (retval & NOUVEAU_DSM_HAS_OPT)
> -			has_optimus = 1;
> +			has_optimus = true;
>  		if (retval & NOUVEAU_DSM_HAS_GMUX)
>  			has_gmux = true;
>  	}
> @@ -344,7 +344,7 @@ static bool nouveau_dsm_detect(void)
>  			acpi_method_name);
>  		nouveau_dsm_priv.optimus_detected = true;
>  		ret = true;
> -	} else if (vga_count == 2 && has_dsm && guid_valid) {
> +	} else if (vga_count == 2 && has_mux && guid_valid) {
>  		acpi_get_name(nouveau_dsm_priv.dhandle, ACPI_FULL_PATHNAME,
>  			&buffer);
>  		printk(KERN_INFO "VGA switcheroo: detected mux DSM switching
>  		method %s handle\n",
> --
> 2.4.1
> 
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> 
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