Add a helper function nr_extradata_entries() to count the number of used
extradata entries in a netconsole target. This refactors the duplicate
code for counting entries into a single function, which will be reused
by upcoming CPU sysdata changes.
The helper uses list_count_nodes() to count the number of children in
the userdata group configfs hierarchy.
Signed-off-by: Breno Leitao <leitao@xxxxxxxxxx>
Reviewed-by: Simon Horman <horms@xxxxxxxxxx>
---
drivers/net/netconsole.c | 14 +++++++++++---
1 file changed, 11 insertions(+), 3 deletions(-)
diff --git a/drivers/net/netconsole.c b/drivers/net/netconsole.c
index 7f05c7f74c31ce26a7329c784bd99305b7bea0e8..15daaba65c8827bf399f0623cc42d310626cbf68 100644
--- a/drivers/net/netconsole.c
+++ b/drivers/net/netconsole.c
@@ -662,6 +662,16 @@ static ssize_t remote_ip_store(struct config_item *item, const char *buf,
return ret;
}
+/* Count number of entries we have in extradata.
+ * This is important because the extradata_complete only supports
+ * MAX_EXTRADATA_ITEMS entries. Before enabling any new {user,sys}data
+ * feature, number of entries needs to checked for available space.
+ */
+static size_t count_extradata_entries(struct netconsole_target *nt)
+{
+ return list_count_nodes(&nt->userdata_group.cg_children);
+}
+
static ssize_t remote_mac_store(struct config_item *item, const char *buf,
size_t count)
{
@@ -811,15 +821,13 @@ static struct config_item *userdatum_make_item(struct config_group *group,
struct netconsole_target *nt;
struct userdatum *udm;
struct userdata *ud;
- size_t child_count;
if (strlen(name) > MAX_EXTRADATA_NAME_LEN)
return ERR_PTR(-ENAMETOOLONG);
ud = to_userdata(&group->cg_item);
nt = userdata_to_target(ud);
- child_count = list_count_nodes(&nt->userdata_group.cg_children);
- if (child_count >= MAX_EXTRADATA_ITEMS)
+ if (count_extradata_entries(nt) >= MAX_EXTRADATA_ITEMS)
return ERR_PTR(-ENOSPC);
udm = kzalloc(sizeof(*udm), GFP_KERNEL);
--
2.43.5
