* because entry 0's reference field has the form XXXX|1--1.
*/
-struct ref_table tipc_ref_table = { 0 };
+struct ref_table tipc_ref_table = { NULL };
-static rwlock_t ref_table_lock = RW_LOCK_UNLOCKED;
+static DEFINE_RWLOCK(ref_table_lock);
/**
* tipc_ref_table_init - create reference table for objects
while (sz < requested_size) {
sz <<= 1;
}
- table = (struct reference *)vmalloc(sz * sizeof(struct reference));
+ table = vmalloc(sz * sizeof(*table));
if (table == NULL)
return -ENOMEM;
write_lock_bh(&ref_table_lock);
index_mask = sz - 1;
for (i = sz - 1; i >= 0; i--) {
- table[i].object = 0;
- table[i].lock = SPIN_LOCK_UNLOCKED;
+ table[i].object = NULL;
+ spin_lock_init(&table[i].lock);
table[i].data.next_plus_upper = (start & ~index_mask) + i - 1;
}
tipc_ref_table.entries = table;
return;
vfree(tipc_ref_table.entries);
- tipc_ref_table.entries = 0;
+ tipc_ref_table.entries = NULL;
}
/**
u32 next_plus_upper;
u32 reference = 0;
- assert(tipc_ref_table.entries && object);
+ if (!object) {
+ err("Attempt to acquire reference to non-existent object\n");
+ return 0;
+ }
+ if (!tipc_ref_table.entries) {
+ err("Reference table not found during acquisition attempt\n");
+ return 0;
+ }
write_lock_bh(&ref_table_lock);
if (tipc_ref_table.first_free) {
u32 index;
u32 index_mask;
- assert(tipc_ref_table.entries);
- assert(ref != 0);
+ if (!ref) {
+ err("Attempt to discard reference 0\n");
+ return;
+ }
+ if (!tipc_ref_table.entries) {
+ err("Reference table not found during discard attempt\n");
+ return;
+ }
write_lock_bh(&ref_table_lock);
index_mask = tipc_ref_table.index_mask;
index = ref & index_mask;
entry = &(tipc_ref_table.entries[index]);
- assert(entry->object != 0);
- assert(entry->data.reference == ref);
+
+ if (!entry->object) {
+ err("Attempt to discard reference to non-existent object\n");
+ goto exit;
+ }
+ if (entry->data.reference != ref) {
+ err("Attempt to discard non-existent reference\n");
+ goto exit;
+ }
/* mark entry as unused */
- entry->object = 0;
+ entry->object = NULL;
if (tipc_ref_table.first_free == 0)
tipc_ref_table.first_free = index;
else
/* increment upper bits of entry to invalidate subsequent references */
entry->data.next_plus_upper = (ref & ~index_mask) + (index_mask + 1);
+exit:
write_unlock_bh(&ref_table_lock);
}