commit c998acb03df614ddf2f3e206582586f191d07fff
author Laszlo Ersek <lersek@redhat.com> Tue May 20 13:42:22 2014 +0200
committer Luiz Capitulino <lcapitulino@redhat.com> Wed Jun 11 10:10:28 2014 -0400
tree 78bc063dda8d084ff74e7f4bb5234cb002471a59
parent 24aeeace7a9f264688e9eda77b6c04db607cbdfd

dump: hoist lzo_init() from get_len_buf_out() to dump_init()

qmp_dump_guest_memory()
  dump_init()
    lzo_init() <---------+
  create_kdump_vmcore()  |
    write_dump_pages()   |
      get_len_buf_out()  |
        lzo_init() ------+

This patch doesn't change the fact that lzo_init() is called for every
LZO-compressed dump, but it makes get_len_buf_out() more focused (single
responsibility).

Suggested-by: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Laszlo Ersek <lersek@redhat.com>
Reviewed-by: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Luiz Capitulino <lcapitulino@redhat.com>

dump.c

diff --git a/dump.c b/dump.c
index 7e0982b..b87045e 100644
--- a/dump.c
+++ b/dump.c
@@ -1231,13 +1231,6 @@
 
     /* buf size for lzo */
 #ifdef CONFIG_LZO
-    if (flag_compress & DUMP_DH_COMPRESSED_LZO) {
-        if (lzo_init() != LZO_E_OK) {
-            /* return 0 to indicate lzo is unavailable */
-            return 0;
-        }
-    }
-
     /*
      * LZO will expand incompressible data by a little amount. please check the
      * following URL to see the expansion calculation:
@@ -1625,6 +1618,12 @@
             break;
 
         case DUMP_GUEST_MEMORY_FORMAT_KDUMP_LZO:
+#ifdef CONFIG_LZO
+            if (lzo_init() != LZO_E_OK) {
+                error_setg(errp, "failed to initialize the LZO library");
+                goto cleanup;
+            }
+#endif
             s->flag_compress = DUMP_DH_COMPRESSED_LZO;
             break;