netdev - Re: [PATCH] Export smbios strings associated with onboard devices to sysfs

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Date:	Mon, 8 Mar 2010 10:34:00 -0700
From:	Alex Chiang <achiang@...com>
To:	Narendra K <Narendra_K@...l.com>
Cc:	matt_domsch@...l.com, netdev@...r.kernel.org,
	linux-hotplug@...r.kernel.org, linux-pci@...r.kernel.org,
	jordan_hargrave@...l.com, sandeep_k_shandilya@...l.com,
	charles_rose@...l.com, shyam_iyer@...l.com
Subject: Re: [PATCH] Export smbios strings associated with onboard devices
	to sysfs

* Narendra K <Narendra_K@...l.com>:
> 
> Resending the patch with review comments incorporated.
> 
> Signed-off-by: Jordan Hargrave <Jordan_Hargrave@...l.com>
> Signed-off-by: Narendra K <Narendra_K@...l.com>
> ---
>  drivers/firmware/dmi_scan.c |   23 ++++++++++++++++++
>  drivers/pci/pci-sysfs.c     |   54 +++++++++++++++++++++++++++++++++++++++++++
>  include/linux/dmi.h         |    9 +++++++
>  3 files changed, 86 insertions(+), 0 deletions(-)
> 
> diff --git a/drivers/firmware/dmi_scan.c b/drivers/firmware/dmi_scan.c
> index 31b983d..1d10663 100644
> --- a/drivers/firmware/dmi_scan.c
> +++ b/drivers/firmware/dmi_scan.c
> @@ -278,6 +278,28 @@ static void __init dmi_save_ipmi_device(const struct dmi_header *dm)
>  	list_add_tail(&dev->list, &dmi_devices);
>  }
>  
> +static void __init dmi_save_devslot(int id, int seg, int bus, int devfn, const char *name)
> +{
> +	struct dmi_devslot *slot;
> +
> +	slot = dmi_alloc(sizeof(*slot) + strlen(name) + 1);
> +	if (!slot) {
> +		printk(KERN_ERR "dmi_save_devslot: out of memory.\n");
> +		return;
> +	}	
> +	slot->id = id;
> +	slot->seg = seg;
> +	slot->bus = bus;
> +	slot->devfn = devfn;
> +
> +	strcpy((char *)&slot[1], name);
> +	slot->dev.type = DMI_DEV_TYPE_DEVSLOT;
> +	slot->dev.name = &slot[1];

This needs a cast, else you'll get a warning:

	slot->dev.name = (char *)&slot[1];

Also, when I was playing with your patchset, I noticed that you
should probably add this hunk too:

@@ -334,6 +359,7 @@ static void __init dmi_decode(const struct dmi_header *dm, v
                break;
        case 41:        /* Onboard Devices Extended Information */
                dmi_save_extended_devices(dm);
+               break;
        }
 }
 

> +#ifdef CONFIG_DMI
> +#include <linux/dmi.h>
> +static ssize_t
> +smbiosname_string_is_valid(struct device *dev, char *buf)
> +{
> +	struct pci_dev *pdev = to_pci_dev(dev);
> +  	struct dmi_device *dmi;

This needs to be a const struct dmi_device, else you get a
warning.

> +  	struct dmi_devslot *dslot;
> +  	int bus;
> +  	int devfn;
> +
> +  	bus = pdev->bus->number;
> +  	devfn = pdev->devfn;
> +
> +  	dmi = NULL;
> +  	while ((dmi = dmi_find_device(DMI_DEV_TYPE_DEVSLOT, NULL, dmi)) != NULL) {
> +    		dslot = dmi->device_data;
> +    		if (dslot && dslot->bus == bus && dslot->devfn == devfn) {
> +			if (buf)
> +      				return scnprintf(buf, PAGE_SIZE, "%s\n", dmi->name);

Whitespace seems messed up here?

> +			return strlen(dmi->name);
> +		}
> +	}
> +}
> +
> +static ssize_t
> +smbiosname_show(struct device *dev, struct device_attribute *attr, char *buf)
> +{
> +	return smbiosname_string_is_valid(dev, buf);
> +
> +}
> +
> +struct smbios_attribute {
> +	struct attribute attr;
> +	ssize_t(*show) (struct device * edev, char *buf);
> +	int (*test) (struct device * edev, char *buf);
> +};
> +
> +#define SMBIOSNAME_DEVICE_ATTR(_name, _mode, _show, _test) \
> +struct smbios_attribute smbios_attr_##_name = { 	\
> +	.attr = {.name = __stringify(_name), .mode = _mode },	\
> +	.show	= _show,				\
> +	.test	= _test,				\
> +};
> +
> +static SMBIOSNAME_DEVICE_ATTR(smbiosname, 0444, smbiosname_show, smbiosname_string_is_valid);
> +#endif
> +

After a discussion on irc, some folks thought that changing the
name of this attribute to 'label' would be a much better name
than smbiosname.

/ac

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