[PATCH] env: sf: fix init function behaviour

[Heiko Schocher]

Michael wrote:
commit 92765f45bb95 ("env: Access Environment in SPI flashes before
relocation") at least breaks the Kontron sl28 board. I guess it also
breaks others which use a (late) SPI environment.

reason is, that env_init() sets the init bit, if there
is no init function defined in an environment driver,
and use default return value -ENOENT in this case
later for setting the default environment.

Change:
Environment driver can now implement an init
function and return, if this function does nothing,
simply -ENOENT.

env_init() now handles -ENOENT correct by setting the
inited bit for the environment driver. And if there
is no other environment driver whose init function
returns 0, load than the default environment.

This prevents that each environment driver needs to set the
default environment.

Fixes: 92765f45bb95 ("env: Access Environment in SPI flashes before relocation")
Reported-by: Michael Walle <michael at walle.cc>
Signed-off-by: Heiko Schocher <hs at denx.de>
---

travis build:
https://travis-ci.org/github/hsdenx/u-boot-test/builds/741049813

 env/env.c | 2 ++
 env/sf.c  | 8 +++++---
 2 files changed, 7 insertions(+), 3 deletions(-)

diff --git a/env/env.c b/env/env.c
index 42c7d8155e..37b4b54cb7 100644
--- a/env/env.c
+++ b/env/env.c
@@ -329,6 +329,8 @@ int env_init(void)
 	for (prio = 0; (drv = env_driver_lookup(ENVOP_INIT, prio)); prio++) {
 		if (!drv->init || !(ret = drv->init()))
 			env_set_inited(drv->location);
+		if (ret == -ENOENT)
+			env_set_inited(drv->location);
 
 		debug("%s: Environment %s init done (ret=%d)\n", __func__,
 		      drv->name, ret);
diff --git a/env/sf.c b/env/sf.c
index 2eb2de1a4e..91ed2860ed 100644
--- a/env/sf.c
+++ b/env/sf.c
@@ -393,10 +393,12 @@ static int env_sf_init(void)
 	return env_sf_init_early();
 #endif
 	/*
-	 * we must return with 0 if there is nothing done,
-	 * else env_set_inited() get not called in env_init()
+	 * return here -ENOENT, so env_init()
+	 * can set the init bit and later if no
+	 * other Environment storage is defined
+	 * can set the default environment
 	 */
-	return 0;
+	return -ENOENT;
 }
 
 U_BOOT_ENV_LOCATION(sf) = {
-- 
2.25.4