1 files changed, 8 insertions, 7 deletions

diff --git a/fs/pstore/ram_core.c b/fs/pstore/ram_core.c
index 31f8d184f3a0..235513c46aaf 100644
--- a/fs/pstore/ram_core.c
+++ b/fs/pstore/ram_core.c
@@ -250,23 +250,24 @@ static void notrace persistent_ram_update(struct persistent_ram_zone *prz,
         persistent_ram_update_ecc(prz, start, count);
 }
 
-static void __init
-persistent_ram_save_old(struct persistent_ram_zone *prz)
+void persistent_ram_save_old(struct persistent_ram_zone *prz)
 {
         struct persistent_ram_buffer *buffer = prz->buffer;
         size_t size = buffer_size(prz);
         size_t start = buffer_start(prz);
-        char *dest;
 
-        persistent_ram_ecc_old(prz);
+        if (!size)
+                return;
 
-        dest = kmalloc(size, GFP_KERNEL);
-        if (dest == NULL) {
+        if (!prz->old_log) {
+                persistent_ram_ecc_old(prz);
+                prz->old_log = kmalloc(size, GFP_KERNEL);
+        }
+        if (!prz->old_log) {
                 pr_err("persistent_ram: failed to allocate buffer\n");
                 return;
         }
 
-        prz->old_log = dest;
         prz->old_log_size = size;
         memcpy(prz->old_log, &buffer->data[start], size - start);
         memcpy(prz->old_log + size - start, &buffer->data[0], start);