[PATCH] xen-netfront: Use static attribute groups for sysfs entries
From: Takashi Iwai <hidden>
Date: 2015-02-04 13:38:59
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 <redacted> --- drivers/net/xen-netfront.c | 62 ++++++++++++---------------------------------- 1 file changed, 16 insertions(+), 46 deletions(-)
diff --git a/drivers/net/xen-netfront.c b/drivers/net/xen-netfront.c
index d8c10764f130..1524d2ee1c21 100644
--- a/drivers/net/xen-netfront.c
+++ b/drivers/net/xen-netfront.c@@ -223,11 +223,7 @@ static grant_ref_t xennet_get_rx_ref(struct netfront_queue *queue, } #ifdef CONFIG_SYSFS -static int xennet_sysfs_addif(struct net_device *netdev); -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) +static const struct attribute_group xennet_dev_group; #endif static bool xennet_can_sg(struct net_device *dev)
@@ -1367,20 +1363,15 @@ static int netfront_probe(struct xenbus_device *dev, info = netdev_priv(netdev); dev_set_drvdata(&dev->dev, info); - +#ifdef CONFIG_SYSFS + info->netdev->sysfs_groups[0] = &xennet_dev_group; +#endif err = register_netdev(info->netdev); if (err) { pr_warn("%s: register_netdev err=%d\n", __func__, err); 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; fail:
@@ -2144,39 +2135,20 @@ static ssize_t store_rxbuf(struct device *dev, return len; } -static struct device_attribute xennet_attrs[] = { - __ATTR(rxbuf_min, S_IRUGO|S_IWUSR, show_rxbuf, store_rxbuf), - __ATTR(rxbuf_max, S_IRUGO|S_IWUSR, show_rxbuf, store_rxbuf), - __ATTR(rxbuf_cur, S_IRUGO, show_rxbuf, NULL), -}; +static DEVICE_ATTR(rxbuf_min, S_IRUGO|S_IWUSR, show_rxbuf, store_rxbuf); +static DEVICE_ATTR(rxbuf_max, S_IRUGO|S_IWUSR, show_rxbuf, store_rxbuf); +static DEVICE_ATTR(rxbuf_cur, S_IRUGO, show_rxbuf, NULL); -static int xennet_sysfs_addif(struct net_device *netdev) -{ - 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]); -} +static struct attribute *xennet_dev_attrs[] = { + &dev_attr_rxbuf_min.attr, + &dev_attr_rxbuf_max.attr, + &dev_attr_rxbuf_cur.attr, + NULL +}; +static const struct attribute_group xennet_dev_group = { + .attrs = xennet_dev_attrs +}; #endif /* CONFIG_SYSFS */ static int xennet_remove(struct xenbus_device *dev)
@@ -2190,8 +2162,6 @@ static int xennet_remove(struct xenbus_device *dev) xennet_disconnect_backend(info); - xennet_sysfs_delif(info->netdev); - unregister_netdev(info->netdev); for (i = 0; i < num_queues; ++i) {
--
2.2.2