diff options
| author | Oliver Neukum <oneukum@suse.com> | 2024-08-29 19:50:55 +0200 |
|---|---|---|
| committer | Jakub Kicinski <kuba@kernel.org> | 2024-09-03 11:36:51 -0700 |
| commit | bab8eb0dd4cb995caa4a0529d5655531c2ec5e8e (patch) | |
| tree | c563cd95efee23b71af62db294a326e12954caf4 /drivers/net/usb | |
| parent | cfd433cecef929b4d92685f570f1a480762ec260 (diff) | |
| download | lwn-bab8eb0dd4cb995caa4a0529d5655531c2ec5e8e.tar.gz lwn-bab8eb0dd4cb995caa4a0529d5655531c2ec5e8e.zip | |
usbnet: modern method to get random MAC
The driver generates a random MAC once on load
and uses it over and over, including on two devices
needing a random MAC at the same time.
Jakub suggested revamping the driver to the modern
API for setting a random MAC rather than fixing
the old stuff.
The bug is as old as the driver.
Signed-off-by: Oliver Neukum <oneukum@suse.com>
Reviewed-by: Simon Horman <horms@kernel.org>
Fixes: 1da177e4c3f4 ("Linux-2.6.12-rc2")
Link: https://patch.msgid.link/20240829175201.670718-1-oneukum@suse.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Diffstat (limited to 'drivers/net/usb')
| -rw-r--r-- | drivers/net/usb/usbnet.c | 11 |
1 files changed, 3 insertions, 8 deletions
diff --git a/drivers/net/usb/usbnet.c b/drivers/net/usb/usbnet.c index 9fd516e8bb10..18eb5ba436df 100644 --- a/drivers/net/usb/usbnet.c +++ b/drivers/net/usb/usbnet.c @@ -61,9 +61,6 @@ /*-------------------------------------------------------------------------*/ -// randomly generated ethernet address -static u8 node_id [ETH_ALEN]; - /* use ethtool to change the level for any given device */ static int msg_level = -1; module_param (msg_level, int, 0); @@ -1725,7 +1722,6 @@ usbnet_probe (struct usb_interface *udev, const struct usb_device_id *prod) dev->net = net; strscpy(net->name, "usb%d", sizeof(net->name)); - eth_hw_addr_set(net, node_id); /* rx and tx sides can use different message sizes; * bind() should set rx_urb_size in that case. @@ -1801,9 +1797,9 @@ usbnet_probe (struct usb_interface *udev, const struct usb_device_id *prod) goto out4; } - /* let userspace know we have a random address */ - if (ether_addr_equal(net->dev_addr, node_id)) - net->addr_assign_type = NET_ADDR_RANDOM; + /* this flags the device for user space */ + if (!is_valid_ether_addr(net->dev_addr)) + eth_hw_addr_random(net); if ((dev->driver_info->flags & FLAG_WLAN) != 0) SET_NETDEV_DEVTYPE(net, &wlan_type); @@ -2211,7 +2207,6 @@ static int __init usbnet_init(void) BUILD_BUG_ON( sizeof_field(struct sk_buff, cb) < sizeof(struct skb_data)); - eth_random_addr(node_id); return 0; } module_init(usbnet_init); |