2 files changed, 14 insertions, 0 deletions

diff --git a/fs/pstore/platform.c b/fs/pstore/platform.c
index 6b3ff045fe6e..ef5ca8a0255c 100644
--- a/fs/pstore/platform.c
+++ b/fs/pstore/platform.c
@@ -188,6 +188,14 @@ static void pstore_register_console(void)
 static void pstore_register_console(void) {}
 #endif
 
+static int pstore_write_compat(enum pstore_type_id type,
+                               enum kmsg_dump_reason reason,
+                               u64 *id, unsigned int part,
+                               size_t size, struct pstore_info *psi)
+{
+        return psi->write_buf(type, reason, id, part, psinfo->buf, size, psi);
+}
+
 /*
  * platform specific persistent storage driver registers with
  * us here. If pstore is already mounted, call the platform
@@ -212,6 +220,8 @@ int pstore_register(struct pstore_info *psi)
                 return -EINVAL;
         }
 
+        if (!psi->write)
+                psi->write = pstore_write_compat;
         psinfo = psi;
         mutex_init(&psinfo->read_mutex);
         spin_unlock(&pstore_lock);
diff --git a/include/linux/pstore.h b/include/linux/pstore.h
index 1bd014b8e432..b107484192fc 100644
--- a/include/linux/pstore.h
+++ b/include/linux/pstore.h
@@ -48,6 +48,10 @@ struct pstore_info {
         int             (*write)(enum pstore_type_id type,
                         enum kmsg_dump_reason reason, u64 *id,
                         unsigned int part, size_t size, struct pstore_info *psi);
+        int             (*write_buf)(enum pstore_type_id type,
+                        enum kmsg_dump_reason reason, u64 *id,
+                        unsigned int part, const char *buf, size_t size,
+                        struct pstore_info *psi);
         int             (*erase)(enum pstore_type_id type, u64 id,
                         struct pstore_info *psi);
         void            *data;