Messages in this thread | | | From | Madhuparna Bhowmik <> | Date | Sun, 23 Feb 2020 16:26:10 +0530 | Subject | Re: [PATCH] net: core: devlink.c: Hold devlink->lock from the beginning of devlink_dpipe_table_register() |
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On Sun, Feb 23, 2020 at 07:43:29AM +0100, Jiri Pirko wrote: > Sat, Feb 22, 2020 at 07:52:34AM CET, madhuparnabhowmik10@gmail.com wrote: > >From: Madhuparna Bhowmik <madhuparnabhowmik10@gmail.com> > > > >devlink_dpipe_table_find() should be called under either > >rcu_read_lock() or devlink->lock. devlink_dpipe_table_register() > >calls devlink_dpipe_table_find() without holding the lock > >and acquires it later. Therefore hold the devlink->lock > >from the beginning of devlink_dpipe_table_register(). > > > >Suggested-by: Jiri Pirko <jiri@mellanox.com> > >Signed-off-by: Madhuparna Bhowmik <madhuparnabhowmik10@gmail.com> > >--- > > net/core/devlink.c | 15 +++++++++++---- > > 1 file changed, 11 insertions(+), 4 deletions(-) > > > >diff --git a/net/core/devlink.c b/net/core/devlink.c > >index 3e8c94155d93..ba9dd8cb98c3 100644 > >--- a/net/core/devlink.c > >+++ b/net/core/devlink.c > >@@ -6840,22 +6840,29 @@ int devlink_dpipe_table_register(struct devlink *devlink, > > { > > struct devlink_dpipe_table *table; > > > >- if (devlink_dpipe_table_find(&devlink->dpipe_table_list, table_name)) > >+ mutex_lock(&devlink->lock); > >+ > >+ if (devlink_dpipe_table_find(&devlink->dpipe_table_list, table_name)) { > >+ mutex_unlock(&devlink->lock); > > return -EEXIST; > >+ } > > > >- if (WARN_ON(!table_ops->size_get)) > >+ if (WARN_ON(!table_ops->size_get)) { > >+ mutex_unlock(&devlink->lock); > > return -EINVAL; > >+ } > > > > table = kzalloc(sizeof(*table), GFP_KERNEL); > >- if (!table) > >+ if (!table) { > >+ mutex_unlock(&devlink->lock); > > Please use "goto unlock" instead of unlocking on multiple places. > Sure, I have sent a new patch. Thank you, Madhuparna > > > > return -ENOMEM; > >+ } > > > > table->name = table_name; > > table->table_ops = table_ops; > > table->priv = priv; > > table->counter_control_extern = counter_control_extern; > > > >- mutex_lock(&devlink->lock); > > list_add_tail_rcu(&table->list, &devlink->dpipe_table_list); > > mutex_unlock(&devlink->lock); > > return 0; > >-- > >2.17.1 > >
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