[qemu-xen staging] hw/nvram/fw_cfg: Simplify fw_cfg_add_from_generator() error propagation

[patchbot@xxxxxxx]

commit a3ad58342a9d88d1baafc0aee39302f79faad480
Author:     Philippe Mathieu-Daudé <philmd@xxxxxxxxxx>
AuthorDate: Tue Jul 21 15:05:51 2020 +0200
Commit:     Philippe Mathieu-Daudé <philmd@xxxxxxxxxx>
CommitDate: Tue Jul 21 16:47:31 2020 +0200

    hw/nvram/fw_cfg: Simplify fw_cfg_add_from_generator() error propagation
    
    Document FWCfgDataGeneratorClass::get_data() return NULL
    on error, and non-NULL on success. This allow us to simplify
    fw_cfg_add_from_generator(). Since we don't need a local
    variable to propagate the error, we can remove the ERRP_GUARD()
    macro.
    
    Suggested-by: Markus Armbruster <armbru@xxxxxxxxxx>
    Signed-off-by: Philippe Mathieu-Daudé <philmd@xxxxxxxxxx>
    Reviewed-by: Markus Armbruster <armbru@xxxxxxxxxx>
    Message-Id: <20200721131911.27380-2-philmd@xxxxxxxxxx>
---
 hw/nvram/fw_cfg.c         | 3 +--
 include/hw/nvram/fw_cfg.h | 4 +++-
 2 files changed, 4 insertions(+), 3 deletions(-)

diff --git a/hw/nvram/fw_cfg.c b/hw/nvram/fw_cfg.c
index 3b1811d3bf..dfa1f2012a 100644
--- a/hw/nvram/fw_cfg.c
+++ b/hw/nvram/fw_cfg.c
@@ -1035,7 +1035,6 @@ void *fw_cfg_modify_file(FWCfgState *s, const char 
*filename,
 void fw_cfg_add_from_generator(FWCfgState *s, const char *filename,
                                const char *gen_id, Error **errp)
 {
-    ERRP_GUARD();
     FWCfgDataGeneratorClass *klass;
     GByteArray *array;
     Object *obj;
@@ -1053,7 +1052,7 @@ void fw_cfg_add_from_generator(FWCfgState *s, const char 
*filename,
     }
     klass = FW_CFG_DATA_GENERATOR_GET_CLASS(obj);
     array = klass->get_data(obj, errp);
-    if (*errp) {
+    if (!array) {
         return;
     }
     size = array->len;
diff --git a/include/hw/nvram/fw_cfg.h b/include/hw/nvram/fw_cfg.h
index 11feae3177..bbcf405649 100644
--- a/include/hw/nvram/fw_cfg.h
+++ b/include/hw/nvram/fw_cfg.h
@@ -32,7 +32,9 @@ typedef struct FWCfgDataGeneratorClass {
      * @obj: the object implementing this interface
      * @errp: pointer to a NULL-initialized error object
      *
-     * Returns: reference to a byte array containing the data.
+     * Returns: reference to a byte array containing the data on success,
+     *          or NULL on error.
+     *
      * The caller should release the reference when no longer
      * required.
      */
--
generated by git-patchbot for /home/xen/git/qemu-xen.git#staging