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xen-netfront: Use static attribute groups for sysfs entries

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Instead of manual calls of device_create_file() and
device_remove_files(), assign the static attribute groups to netdev
groups array.  This simplifies the code and avoids the possible
races.

Signed-off-by: Takashi Iwai <tiwai@suse.de>
Acked-by: David Vrabel <david.vrabel@citrix.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Takashi Iwai 2015-02-04 14:38:55 +01:00 committed by David S. Miller
parent c4d33e24b6
commit 27b917e54b
1 changed files with 16 additions and 46 deletions
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62
drivers/net/xen-netfront.c
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@ -219,11 +219,7 @@ static grant_ref_t xennet_get_rx_ref(struct netfront_queue *queue,
} }
#ifdef CONFIG_SYSFS #ifdef CONFIG_SYSFS
static int xennet_sysfs_addif(struct net_device *netdev); static const struct attribute_group xennet_dev_group;
static void xennet_sysfs_delif(struct net_device *netdev);
#else /* !CONFIG_SYSFS */
#define xennet_sysfs_addif(dev) (0)
#define xennet_sysfs_delif(dev) do { } while (0)
#endif #endif
static bool xennet_can_sg(struct net_device *dev) static bool xennet_can_sg(struct net_device *dev)
@ -1317,20 +1313,15 @@ static int netfront_probe(struct xenbus_device *dev,
info = netdev_priv(netdev); info = netdev_priv(netdev);
dev_set_drvdata(&dev->dev, info); dev_set_drvdata(&dev->dev, info);
#ifdef CONFIG_SYSFS
info->netdev->sysfs_groups[0] = &xennet_dev_group;
#endif
err = register_netdev(info->netdev); err = register_netdev(info->netdev);
if (err) { if (err) {
pr_warn("%s: register_netdev err=%d\n", __func__, err); pr_warn("%s: register_netdev err=%d\n", __func__, err);
goto fail; goto fail;
} }
err = xennet_sysfs_addif(info->netdev);
if (err) {
unregister_netdev(info->netdev);
pr_warn("%s: add sysfs failed err=%d\n", __func__, err);
goto fail;
}
return 0; return 0;
fail: fail:
@ -2094,39 +2085,20 @@ static ssize_t store_rxbuf(struct device *dev,
return len; return len;
} }
static struct device_attribute xennet_attrs[] = { static DEVICE_ATTR(rxbuf_min, S_IRUGO|S_IWUSR, show_rxbuf, store_rxbuf);
__ATTR(rxbuf_min, S_IRUGO|S_IWUSR, show_rxbuf, store_rxbuf), static DEVICE_ATTR(rxbuf_max, S_IRUGO|S_IWUSR, show_rxbuf, store_rxbuf);
__ATTR(rxbuf_max, S_IRUGO|S_IWUSR, show_rxbuf, store_rxbuf), static DEVICE_ATTR(rxbuf_cur, S_IRUGO, show_rxbuf, NULL);
__ATTR(rxbuf_cur, S_IRUGO, show_rxbuf, NULL),
static struct attribute *xennet_dev_attrs[] = {
&dev_attr_rxbuf_min.attr,
&dev_attr_rxbuf_max.attr,
&dev_attr_rxbuf_cur.attr,
NULL
}; };
static int xennet_sysfs_addif(struct net_device *netdev) static const struct attribute_group xennet_dev_group = {
{ .attrs = xennet_dev_attrs
int i; };
int err;
for (i = 0; i < ARRAY_SIZE(xennet_attrs); i++) {
err = device_create_file(&netdev->dev,
&xennet_attrs[i]);
if (err)
goto fail;
}
return 0;
fail:
while (--i >= 0)
device_remove_file(&netdev->dev, &xennet_attrs[i]);
return err;
}
static void xennet_sysfs_delif(struct net_device *netdev)
{
int i;
for (i = 0; i < ARRAY_SIZE(xennet_attrs); i++)
device_remove_file(&netdev->dev, &xennet_attrs[i]);
}
#endif /* CONFIG_SYSFS */ #endif /* CONFIG_SYSFS */
static int xennet_remove(struct xenbus_device *dev) static int xennet_remove(struct xenbus_device *dev)
@ -2140,8 +2112,6 @@ static int xennet_remove(struct xenbus_device *dev)
xennet_disconnect_backend(info); xennet_disconnect_backend(info);
xennet_sysfs_delif(info->netdev);
unregister_netdev(info->netdev); unregister_netdev(info->netdev);
for (i = 0; i < num_queues; ++i) { for (i = 0; i < num_queues; ++i) {