LU-5458: libcfs: protect kkuc_groups from write access

[fs/lustre-release.git] / libcfs / libcfs / kernel_user_comm.c

diff --git a/libcfs/libcfs/kernel_user_comm.c b/libcfs/libcfs/kernel_user_comm.c
index 1c5e0ee..5ac789e 100644 (file)
--- a/libcfs/libcfs/kernel_user_comm.c
+++ b/libcfs/libcfs/kernel_user_comm.c
@@ -306,7 +306,7 @@ int libcfs_kkuc_group_put(int group, void *payload)
        int one_success = 0;
        ENTRY;
 
-       down_read(&kg_sem);
+       down_write(&kg_sem);
        list_for_each_entry(reg, &kkuc_groups[group], kr_chain) {
                if (reg->kr_fp != NULL) {
                        rc = libcfs_kkuc_msg_put(reg->kr_fp, payload);
@@ -318,7 +318,7 @@ int libcfs_kkuc_group_put(int group, void *payload)
                        }
                }
        }
-       up_read(&kg_sem);
+       up_write(&kg_sem);
 
        /* don't return an error if the message has been delivered
         * at least to one agent */