pstore/ram: Restore ecc information block

This was lost when proc/last_kmsg moved to pstore/console-ramoops.

Signed-off-by: Arve Hjønnevåg <arve@android.com>
Signed-off-by: John Stultz <john.stultz@linaro.org>
Acked-by: Kees Cook <keescook@chromium.org>
Signed-off-by: Anton Vorontsov <anton@enomsg.org>

2 files changed, 13 insertions, 2 deletions

diff --git a/fs/pstore/ram.c b/fs/pstore/ram.c
index a5ee252c264e..32cbd7c8a90c 100644
--- a/fs/pstore/ram.c
+++ b/fs/pstore/ram.c
@@ -136,6 +136,7 @@ static ssize_t ramoops_pstore_read(u64 *id, enum pstore_type_id *type,
                                    char **buf, struct pstore_info *psi)
 {
         ssize_t size;
+        ssize_t ecc_notice_size;
         struct ramoops_context *cxt = psi->data;
         struct persistent_ram_zone *prz;
 
@@ -156,11 +157,18 @@ static ssize_t ramoops_pstore_read(u64 *id, enum pstore_type_id *type,
         time->tv_nsec = 0;
 
         size = persistent_ram_old_size(prz);
-        *buf = kmemdup(persistent_ram_old(prz), size, GFP_KERNEL);
+
+        /* ECC correction notice */
+        ecc_notice_size = persistent_ram_ecc_string(prz, NULL, 0);
+
+        *buf = kmalloc(size + ecc_notice_size + 1, GFP_KERNEL);
         if (*buf == NULL)
                 return -ENOMEM;
 
-        return size;
+        memcpy(*buf, persistent_ram_old(prz), size);
+        persistent_ram_ecc_string(prz, *buf + size, ecc_notice_size + 1);
+
+        return size + ecc_notice_size;
 }
 
 static size_t ramoops_write_kmsg_hdr(struct persistent_ram_zone *prz)
diff --git a/fs/pstore/ram_core.c b/fs/pstore/ram_core.c
index c6f641c10179..59337326e288 100644
--- a/fs/pstore/ram_core.c
+++ b/fs/pstore/ram_core.c
@@ -235,6 +235,9 @@ ssize_t persistent_ram_ecc_string(struct persistent_ram_zone *prz,
 {
         ssize_t ret;
 
+        if (!prz->ecc_info.ecc_size)
+                return 0;
+
         if (prz->corrected_bytes || prz->bad_blocks)
                 ret = snprintf(str, len, ""
                         "\n%d Corrected bytes, %d unrecoverable blocks\n",