linux-kernel - Re: [PATCH v2 03/10] PCI/sysfs: Calculate bin_attribute size through bin

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Message-ID: <20241107162707.GA1618544@bhelgaas>
Date: Thu, 7 Nov 2024 10:27:07 -0600
From: Bjorn Helgaas <helgaas@...nel.org>
To: Thomas Weißschuh <linux@...ssschuh.net>
Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	"Rafael J. Wysocki" <rafael@...nel.org>,
	Bjorn Helgaas <bhelgaas@...gle.com>,
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Subject: Re: [PATCH v2 03/10] PCI/sysfs: Calculate bin_attribute size through
 bin_size()

On Sun, Nov 03, 2024 at 05:03:32PM +0000, Thomas Weißschuh wrote:
> Stop abusing the is_bin_visible() callback to calculate the attribute
> size. Instead use the new, dedicated bin_size() one.
> 
> Signed-off-by: Thomas Weißschuh <linux@...ssschuh.net>

Acked-by: Bjorn Helgaas <bhelgaas@...gle.com>

Thanks for doing this!

> ---
>  drivers/pci/pci-sysfs.c | 28 ++++++++++++++++------------
>  1 file changed, 16 insertions(+), 12 deletions(-)
> 
> diff --git a/drivers/pci/pci-sysfs.c b/drivers/pci/pci-sysfs.c
> index 5d0f4db1cab78674c5e5906f321bf7a57b742983..040f01b2b999175e8d98b05851edc078bbabbe0d 100644
> --- a/drivers/pci/pci-sysfs.c
> +++ b/drivers/pci/pci-sysfs.c
> @@ -818,21 +818,20 @@ static struct bin_attribute *pci_dev_config_attrs[] = {
>  	NULL,
>  };
>  
> -static umode_t pci_dev_config_attr_is_visible(struct kobject *kobj,
> -					      struct bin_attribute *a, int n)
> +static size_t pci_dev_config_attr_bin_size(struct kobject *kobj,
> +					   const struct bin_attribute *a,
> +					   int n)
>  {
>  	struct pci_dev *pdev = to_pci_dev(kobj_to_dev(kobj));
>  
> -	a->size = PCI_CFG_SPACE_SIZE;
>  	if (pdev->cfg_size > PCI_CFG_SPACE_SIZE)
> -		a->size = PCI_CFG_SPACE_EXP_SIZE;
> -
> -	return a->attr.mode;
> +		return PCI_CFG_SPACE_EXP_SIZE;
> +	return PCI_CFG_SPACE_SIZE;
>  }
>  
>  static const struct attribute_group pci_dev_config_attr_group = {
>  	.bin_attrs = pci_dev_config_attrs,
> -	.is_bin_visible = pci_dev_config_attr_is_visible,
> +	.bin_size = pci_dev_config_attr_bin_size,
>  };
>  
>  /*
> @@ -1330,21 +1329,26 @@ static umode_t pci_dev_rom_attr_is_visible(struct kobject *kobj,
>  					   struct bin_attribute *a, int n)
>  {
>  	struct pci_dev *pdev = to_pci_dev(kobj_to_dev(kobj));
> -	size_t rom_size;
>  
>  	/* If the device has a ROM, try to expose it in sysfs. */
> -	rom_size = pci_resource_len(pdev, PCI_ROM_RESOURCE);
> -	if (!rom_size)
> +	if (!pci_resource_end(pdev, PCI_ROM_RESOURCE))
>  		return 0;
>  
> -	a->size = rom_size;
> -
>  	return a->attr.mode;
>  }
>  
> +static size_t pci_dev_rom_attr_bin_size(struct kobject *kobj,
> +					const struct bin_attribute *a, int n)
> +{
> +	struct pci_dev *pdev = to_pci_dev(kobj_to_dev(kobj));
> +
> +	return pci_resource_len(pdev, PCI_ROM_RESOURCE);
> +}
> +
>  static const struct attribute_group pci_dev_rom_attr_group = {
>  	.bin_attrs = pci_dev_rom_attrs,
>  	.is_bin_visible = pci_dev_rom_attr_is_visible,
> +	.bin_size = pci_dev_rom_attr_bin_size,
>  };
>  
>  static ssize_t reset_store(struct device *dev, struct device_attribute *attr,
> 
> -- 
> 2.47.0
>