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sparc64: check if a client is allowed to register for MDESC notifications 

Check if a client is supported, by comparing against a whitelist, to
register for notifications from Machine Description (MDESC)

Signed-off-by: Jagannathan Raman <jag.raman@oracle.com>
Reviewed-by: Liam Merwick <liam.merwick@oracle.com>
Reviewed-by: Shannon Nelson <shannon.nelson@oracle.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Jag Raman 2017-06-23 14:58:37 -04:00 committed by David S. Miller
parent 0542eb7de7
commit 110f2264b3
1 changed files with 17 additions and 0 deletions
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17
arch/sparc/kernel/mdesc.c
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@ -284,9 +284,26 @@ static struct mdesc_notifier_client *client_list;
void mdesc_register_notifier(struct mdesc_notifier_client *client) void mdesc_register_notifier(struct mdesc_notifier_client *client)
{ {
bool supported = false;
u64 node; u64 node;
int i;
mutex_lock(&mdesc_mutex); mutex_lock(&mdesc_mutex);
/* check to see if the node is supported for registration */
for (i = 0; md_node_ops_table[i].name != NULL; i++) {
if (strcmp(md_node_ops_table[i].name, client->node_name) == 0) {
supported = true;
break;
}
}
if (!supported) {
pr_err("MD: %s node not supported\n", client->node_name);
mutex_unlock(&mdesc_mutex);
return;
}
client->next = client_list; client->next = client_list;
client_list = client; client_list = client;