Add an assert to verify that the device lock is always held throughout
reload operations.
Tested the following flows with netdevsim and mlxsw while lockdep is
enabled:
netdevsim:
# echo "10 1" > /sys/bus/netdevsim/new_device
# devlink dev reload netdevsim/netdevsim10
# ip netns add bla
# devlink dev reload netdevsim/netdevsim10 netns bla
# ip netns del bla
# echo 10 > /sys/bus/netdevsim/del_device
mlxsw:
# devlink dev reload pci/0000:01:00.0
# ip netns add bla
# devlink dev reload pci/0000:01:00.0 netns bla
# ip netns del bla
# echo 1 > /sys/bus/pci/devices/0000\:01\:00.0/remove
# echo 1 > /sys/bus/pci/rescan
Signed-off-by: Ido Schimmel <idosch@nvidia.com>
Reviewed-by: Jiri Pirko <jiri@nvidia.com>
Signed-off-by: Petr Machata <petrm@nvidia.com>
Reviewed-by: Simon Horman <horms@kernel.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
* Copyright (c) 2016 Jiri Pirko <jiri@mellanox.com>
*/
+#include <linux/device.h>
#include <net/genetlink.h>
#include <net/sock.h>
#include "devl_internal.h"
struct net *curr_net;
int err;
+ /* Make sure the reload operations are invoked with the device lock
+ * held to allow drivers to trigger functionality that expects it
+ * (e.g., PCI reset) and to close possible races between these
+ * operations and probe/remove.
+ */
+ device_lock_assert(devlink->dev);
+
memcpy(remote_reload_stats, devlink->stats.remote_reload_stats,
sizeof(remote_reload_stats));