[Skiboot] [PATCH v2 1/8] opal: Update opal_del_host_sync_notifier() to accept 'void *data'

[Andrew Donnellan]

On 10/12/18 1:17 am, Vaibhav Jain wrote:
> Current implementation of opal_del_host_sync_notifier() will only
> delete the first entry of the 'notify' callback found from opal_syncers
> list irrespective of the 'data' of list-node. This is problematic when
> multiple notifiers with same callback function but different 'data'
> are registered. In this case when the cleanup code will call
> opal_del_host_sync_notifier() it cannot be sure if correct opal_syncer
> is removed.
> 
> Hence this patch updates the function to accept a new argument named
> 'void *data' which is then used to iterates over the opal_syncers list
> and only remove the first node node having the matching value for
> 'notify' callback as 'data'.
> 
> Signed-off-by: Vaibhav Jain <vaibhav at linux.ibm.com>

Reviewed-by: Andrew Donnellan <andrew.donnellan at au1.ibm.com>

> ---
> Change-log:
> v2: Instead of introducing a new function, update the existing
>      function opal_del_host_sync_notifier() to accept 'void *data' [Vasant]
> ---
>   core/opal.c             | 7 +++++--
>   include/opal-internal.h | 2 +-
>   2 files changed, 6 insertions(+), 3 deletions(-)
> 
> diff --git a/core/opal.c b/core/opal.c
> index 3a8ea30b..87aca61c 100644
> --- a/core/opal.c
> +++ b/core/opal.c
> @@ -683,12 +683,15 @@ void opal_add_host_sync_notifier(bool (*notify)(void *data), void *data)
>   	list_add_tail(&opal_syncers, &ent->link);
>   }
>   
> -void opal_del_host_sync_notifier(bool (*notify)(void *data))
> +/*
> + * Remove a host sync notifier for given callback and data
> + */
> +void opal_del_host_sync_notifier(bool (*notify)(void *data), void *data)
>   {
>   	struct opal_sync_entry *ent;
>   
>   	list_for_each(&opal_syncers, ent, link) {
> -		if (ent->notify == notify) {
> +		if (ent->notify == notify && ent->data == data) {
>   			list_del(&ent->link);
>   			free(ent);
>   			return;
> diff --git a/include/opal-internal.h b/include/opal-internal.h
> index 40bad457..2ce25adb 100644
> --- a/include/opal-internal.h
> +++ b/include/opal-internal.h
> @@ -76,7 +76,7 @@ extern void opal_run_pollers(void);
>    * Warning: no locking, only call that from the init processor
>    */
>   extern void opal_add_host_sync_notifier(bool (*notify)(void *data), void *data);
> -extern void opal_del_host_sync_notifier(bool (*notify)(void *data));
> +extern void opal_del_host_sync_notifier(bool (*notify)(void *data), void *data);
>   
>   /*
>    * Opal internal function prototype
> 

-- 
Andrew Donnellan              OzLabs, ADL Canberra
andrew.donnellan at au1.ibm.com  IBM Australia Limited