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devlink: don't crash if netdev is NULL

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Following change will add support for a corner case where
we may not have a netdev to pass to devlink_port_type_eth_set()
but we still want to set port type.

This is definitely a corner case, and drivers should not normally
pass NULL netdev - print a warning message when this happens.

Sadly for other port types (ib) switches don't have a device
reference, the way we always do for Ethernet, so we can't put
the warning in __devlink_port_type_set().

Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Jakub Kicinski 2020-09-08 15:21:13 -07:00 committed by David S. Miller
parent 6eb8b7fbe3
commit 3ea87ca772
1 changed files with 20 additions and 8 deletions
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28
net/core/devlink.c
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@ -7608,14 +7608,8 @@ static void __devlink_port_type_set(struct devlink_port *devlink_port,
devlink_port_notify(devlink_port, DEVLINK_CMD_PORT_NEW);
}
/**
* devlink_port_type_eth_set - Set port type to Ethernet
*
* @devlink_port: devlink port
* @netdev: related netdevice
*/
void devlink_port_type_eth_set(struct devlink_port *devlink_port,
struct net_device *netdev)
static void devlink_port_type_netdev_checks(struct devlink_port *devlink_port,
struct net_device *netdev)
{
const struct net_device_ops *ops = netdev->netdev_ops;
@ -7649,6 +7643,24 @@ void devlink_port_type_eth_set(struct devlink_port *devlink_port,
err = ops->ndo_get_port_parent_id(netdev, &ppid);
WARN_ON(err != -EOPNOTSUPP);
}
}
/**
* devlink_port_type_eth_set - Set port type to Ethernet
*
* @devlink_port: devlink port
* @netdev: related netdevice
*/
void devlink_port_type_eth_set(struct devlink_port *devlink_port,
struct net_device *netdev)
{
if (netdev)
devlink_port_type_netdev_checks(devlink_port, netdev);
else
dev_warn(devlink_port->devlink->dev,
"devlink port type for port %d set to Ethernet without a software interface reference, device type not supported by the kernel?\n",
devlink_port->index);
__devlink_port_type_set(devlink_port, DEVLINK_PORT_TYPE_ETH, netdev);
}
EXPORT_SYMBOL_GPL(devlink_port_type_eth_set);