diff options
| -rw-r--r-- | net/batman-adv/bat_iv_ogm.c | 115 |
1 files changed, 76 insertions, 39 deletions
diff --git a/net/batman-adv/bat_iv_ogm.c b/net/batman-adv/bat_iv_ogm.c index 682fcaec56e6..8c1710bba803 100644 --- a/net/batman-adv/bat_iv_ogm.c +++ b/net/batman-adv/bat_iv_ogm.c @@ -32,6 +32,7 @@ #include <linux/jiffies.h> #include <linux/list.h> #include <linux/kref.h> +#include <linux/lockdep.h> #include <linux/netdevice.h> #include <linux/pkt_sched.h> #include <linux/printk.h> @@ -175,71 +176,107 @@ unlock: } /** - * batadv_iv_ogm_orig_del_if - change the private structures of the orig_node to - * exclude the removed interface + * batadv_iv_ogm_drop_bcast_own_entry - drop section of bcast_own * @orig_node: the orig_node that has to be changed * @max_if_num: the current amount of interfaces * @del_if_num: the index of the interface being removed - * - * Return: 0 on success, a negative error code otherwise. */ -static int batadv_iv_ogm_orig_del_if(struct batadv_orig_node *orig_node, - int max_if_num, int del_if_num) +static void +batadv_iv_ogm_drop_bcast_own_entry(struct batadv_orig_node *orig_node, + int max_if_num, int del_if_num) { - int ret = -ENOMEM; - size_t chunk_size, if_offset; - void *data_ptr = NULL; - - spin_lock_bh(&orig_node->bat_iv.ogm_cnt_lock); + size_t chunk_size; + size_t if_offset; + void *data_ptr; - /* last interface was removed */ - if (max_if_num == 0) - goto free_bcast_own; + lockdep_assert_held(&orig_node->bat_iv.ogm_cnt_lock); chunk_size = sizeof(unsigned long) * BATADV_NUM_WORDS; data_ptr = kmalloc_array(max_if_num, chunk_size, GFP_ATOMIC); if (!data_ptr) - goto unlock; + /* use old buffer when new one could not be allocated */ + data_ptr = orig_node->bat_iv.bcast_own; /* copy first part */ - memcpy(data_ptr, orig_node->bat_iv.bcast_own, del_if_num * chunk_size); + memmove(data_ptr, orig_node->bat_iv.bcast_own, del_if_num * chunk_size); /* copy second part */ if_offset = (del_if_num + 1) * chunk_size; - memcpy((char *)data_ptr + del_if_num * chunk_size, - (uint8_t *)orig_node->bat_iv.bcast_own + if_offset, - (max_if_num - del_if_num) * chunk_size); + memmove((char *)data_ptr + del_if_num * chunk_size, + (uint8_t *)orig_node->bat_iv.bcast_own + if_offset, + (max_if_num - del_if_num) * chunk_size); -free_bcast_own: - kfree(orig_node->bat_iv.bcast_own); - orig_node->bat_iv.bcast_own = data_ptr; + /* bcast_own was shrunk down in new buffer; free old one */ + if (orig_node->bat_iv.bcast_own != data_ptr) { + kfree(orig_node->bat_iv.bcast_own); + orig_node->bat_iv.bcast_own = data_ptr; + } +} + +/** + * batadv_iv_ogm_drop_bcast_own_sum_entry - drop section of bcast_own_sum + * @orig_node: the orig_node that has to be changed + * @max_if_num: the current amount of interfaces + * @del_if_num: the index of the interface being removed + */ +static void +batadv_iv_ogm_drop_bcast_own_sum_entry(struct batadv_orig_node *orig_node, + int max_if_num, int del_if_num) +{ + size_t if_offset; + void *data_ptr; - if (max_if_num == 0) - goto free_own_sum; + lockdep_assert_held(&orig_node->bat_iv.ogm_cnt_lock); data_ptr = kmalloc_array(max_if_num, sizeof(u8), GFP_ATOMIC); - if (!data_ptr) { - kfree(orig_node->bat_iv.bcast_own); - goto unlock; - } + if (!data_ptr) + /* use old buffer when new one could not be allocated */ + data_ptr = orig_node->bat_iv.bcast_own_sum; - memcpy(data_ptr, orig_node->bat_iv.bcast_own_sum, - del_if_num * sizeof(u8)); + memmove(data_ptr, orig_node->bat_iv.bcast_own_sum, + del_if_num * sizeof(u8)); if_offset = (del_if_num + 1) * sizeof(u8); - memcpy((char *)data_ptr + del_if_num * sizeof(u8), - orig_node->bat_iv.bcast_own_sum + if_offset, - (max_if_num - del_if_num) * sizeof(u8)); + memmove((char *)data_ptr + del_if_num * sizeof(u8), + orig_node->bat_iv.bcast_own_sum + if_offset, + (max_if_num - del_if_num) * sizeof(u8)); + + /* bcast_own_sum was shrunk down in new buffer; free old one */ + if (orig_node->bat_iv.bcast_own_sum != data_ptr) { + kfree(orig_node->bat_iv.bcast_own_sum); + orig_node->bat_iv.bcast_own_sum = data_ptr; + } +} -free_own_sum: - kfree(orig_node->bat_iv.bcast_own_sum); - orig_node->bat_iv.bcast_own_sum = data_ptr; +/** + * batadv_iv_ogm_orig_del_if - change the private structures of the orig_node to + * exclude the removed interface + * @orig_node: the orig_node that has to be changed + * @max_if_num: the current amount of interfaces + * @del_if_num: the index of the interface being removed + * + * Return: 0 on success, a negative error code otherwise. + */ +static int batadv_iv_ogm_orig_del_if(struct batadv_orig_node *orig_node, + int max_if_num, int del_if_num) +{ + spin_lock_bh(&orig_node->bat_iv.ogm_cnt_lock); + + if (max_if_num == 0) { + kfree(orig_node->bat_iv.bcast_own); + kfree(orig_node->bat_iv.bcast_own_sum); + orig_node->bat_iv.bcast_own = NULL; + orig_node->bat_iv.bcast_own_sum = NULL; + } else { + batadv_iv_ogm_drop_bcast_own_entry(orig_node, max_if_num, + del_if_num); + batadv_iv_ogm_drop_bcast_own_sum_entry(orig_node, max_if_num, + del_if_num); + } - ret = 0; -unlock: spin_unlock_bh(&orig_node->bat_iv.ogm_cnt_lock); - return ret; + return 0; } /** |