diff options
| author | Jakub Kicinski <kuba@kernel.org> | 2021-10-30 10:18:51 -0700 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2021-11-01 13:26:07 +0000 |
| commit | 1af0a0948e28d83bcfa9d48cd0f992f616c5d62e (patch) | |
| tree | bd94424fa9d4bf6788edba77057a6822f3007d14 /include/net | |
| parent | 46db1b77cd4f082c4e908c8f8086a2f7aae28b62 (diff) | |
| download | linux-1af0a0948e28d83bcfa9d48cd0f992f616c5d62e.tar.bz2 | |
ethtool: don't drop the rtnl_lock half way thru the ioctl
devlink compat code needs to drop rtnl_lock to take
devlink->lock to ensure correct lock ordering.
This is problematic because we're not strictly guaranteed
that the netdev will not disappear after we re-lock.
It may open a possibility of nested ->begin / ->complete
calls.
Instead of calling into devlink under rtnl_lock take
a ref on the devlink instance and make the call after
we've dropped rtnl_lock.
We (continue to) assume that netdevs have an implicit
reference on the devlink returned from ndo_get_devlink_port
Note that ndo_get_devlink_port will now get called
under rtnl_lock. That should be fine since none of
the drivers seem to be taking serious locks inside
ndo_get_devlink_port.
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Reviewed-by: Leon Romanovsky <leonro@nvidia.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'include/net')
| -rw-r--r-- | include/net/devlink.h | 8 |
1 files changed, 4 insertions, 4 deletions
diff --git a/include/net/devlink.h b/include/net/devlink.h index 991ce48f77ca..aab3d007c577 100644 --- a/include/net/devlink.h +++ b/include/net/devlink.h @@ -1729,9 +1729,9 @@ devlink_trap_policers_unregister(struct devlink *devlink, struct devlink *__must_check devlink_try_get(struct devlink *devlink); void devlink_put(struct devlink *devlink); -void devlink_compat_running_version(struct net_device *dev, +void devlink_compat_running_version(struct devlink *devlink, char *buf, size_t len); -int devlink_compat_flash_update(struct net_device *dev, const char *file_name); +int devlink_compat_flash_update(struct devlink *devlink, const char *file_name); int devlink_compat_phys_port_name_get(struct net_device *dev, char *name, size_t len); int devlink_compat_switch_id_get(struct net_device *dev, @@ -1749,12 +1749,12 @@ static inline void devlink_put(struct devlink *devlink) } static inline void -devlink_compat_running_version(struct net_device *dev, char *buf, size_t len) +devlink_compat_running_version(struct devlink *devlink, char *buf, size_t len) { } static inline int -devlink_compat_flash_update(struct net_device *dev, const char *file_name) +devlink_compat_flash_update(struct devlink *devlink, const char *file_name) { return -EOPNOTSUPP; } |