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devlink: expose get/put functions

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Allow those who hold implicit reference on a devlink instance
to try to take a full ref on it. This will be used from netdev
code which has an implicit ref because of driver call ordering.

Note that after recent changes devlink_unregister() may happen
before netdev unregister, but devlink_free() should still happen
after, so we are safe to try, but we can't just refcount_inc()
and assume it's not zero.

Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Reviewed-by: Leon Romanovsky <leonro@nvidia.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Jakub Kicinski 2021-10-30 10:18:50 -07:00 committed by David S. Miller
parent 095cfcfe13
commit 46db1b77cd
2 changed files with 17 additions and 3 deletions
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12
include/net/devlink.h
View file

@ -1726,6 +1726,9 @@ devlink_trap_policers_unregister(struct devlink *devlink,
#if IS_ENABLED(CONFIG_NET_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,
char *buf, size_t len);
int devlink_compat_flash_update(struct net_device *dev, const char *file_name);
@ -1736,6 +1739,15 @@ int devlink_compat_switch_id_get(struct net_device *dev,
#else
static inline struct devlink *devlink_try_get(struct devlink *devlink)
{
return NULL;
}
static inline void devlink_put(struct devlink *devlink)
{
}
static inline void
devlink_compat_running_version(struct net_device *dev, char *buf, size_t len)
{

8
net/core/devlink.c
View file

@ -182,15 +182,17 @@ struct net *devlink_net(const struct devlink *devlink)
}
EXPORT_SYMBOL_GPL(devlink_net);
static void devlink_put(struct devlink *devlink)
void devlink_put(struct devlink *devlink)
{
if (refcount_dec_and_test(&devlink->refcount))
complete(&devlink->comp);
}
static bool __must_check devlink_try_get(struct devlink *devlink)
struct devlink *__must_check devlink_try_get(struct devlink *devlink)
{
return refcount_inc_not_zero(&devlink->refcount);
if (refcount_inc_not_zero(&devlink->refcount))
return devlink;
return NULL;
}
static struct devlink *devlink_get_from_attrs(struct net *net,