On 12.07.2018 12:52, Nicholas Faustini wrote:
When called with ENVOP_SAVE, env_get_location() only returns the
gd->env_load_location variable without actually checking for
the environment location and priority.

This behaviour causes env_save() to fall into an infinite loop when
the low-level drv->save() call fails.

The env_save() function should not loop through the environment
location list but it should save the environment into the location
stored in gd->env_load_location by the last env_load() call.

Signed-off-by: Nicholas Faustini <nicholas.faust...@azcomtech.com>
---

Changes in v2:
- Restore gd->env_load_location to the highest priority location when
   env_load() fails

  env/env.c | 10 ++++++----
  1 file changed, 6 insertions(+), 4 deletions(-)

diff --git a/env/env.c b/env/env.c
index 5c0842a..18eb78d 100644
--- a/env/env.c
+++ b/env/env.c
@@ -205,22 +205,24 @@ int env_load(void)
                        return 0;
        }
+ env_get_location(ENVOP_LOAD, 0);

A comment why this is required would be good, I guess.

+
        return -ENODEV;
  }
int env_save(void)
  {
        struct env_driver *drv;
-       int prio;
- for (prio = 0; (drv = env_driver_lookup(ENVOP_SAVE, prio)); prio++) {
+       drv = env_driver_lookup(ENVOP_SAVE, 0);

Thinking again about this, would it make more sense to store 'env_load_prio' in 'gd' after successful load? That way, 'env_get_location()' would be more straightforward (no special case for ENVOP_SAVE) and here in 'env_save()' we could just write something like this:

drv = env_driver_lookup(ENVOP_SAVE, gd->env_load_prio);


Simon

+       if (drv) {
                int ret;
if (!drv->save)
-                       continue;
+                       return -ENODEV;
if (!env_has_inited(drv->location))
-                       continue;
+                       return -ENODEV;
printf("Saving Environment to %s... ", drv->name);
                ret = drv->save();

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