env: move more common code to env_import_redund

There is more common code in mmc, nand and ubi env drivers that
can be shared by moving to env_import_redund.

For this, a status/error value whether the buffers were loaded
are passed as additional parameters to env_import_redund.
Ideally, these are already returned to the env driver by the
storage driver. This is the case for mmc, nand and ubi, so for
this change, code deduplicated.

Signed-off-by: Simon Goldschmidt <sgoldschmidt@de.pepperl-fuchs.com>
Acked-by: Maxime Ripard <maxime.ripard@free-electrons.com>

env/common.c

@@ -138,7 +138,8 @@ int env_import(const char *buf, int check)
 #ifdef CONFIG_SYS_REDUNDAND_ENVIRONMENT
 static unsigned char env_flags;
 
-int env_import_redund(const char *buf1, const char *buf2)
+int env_import_redund(const char *buf1, int buf1_read_fail,
+		      const char *buf2, int buf2_read_fail)
 {
 	int crc1_ok, crc2_ok;
 	env_t *ep, *tmp_env1, *tmp_env2;
@@ -146,6 +147,24 @@ int env_import_redund(const char *buf1, const char *buf2)
 	tmp_env1 = (env_t *)buf1;
 	tmp_env2 = (env_t *)buf2;
 
+	if (buf1_read_fail && buf2_read_fail) {
+		puts("*** Error - No Valid Environment Area found\n");
+	} else if (buf1_read_fail || buf2_read_fail) {
+		puts("*** Warning - some problems detected ");
+		puts("reading environment; recovered successfully\n");
+	}
+
+	if (buf1_read_fail && buf2_read_fail) {
+		set_default_env("!bad env area");
+		return -EIO;
+	} else if (!buf1_read_fail && buf2_read_fail) {
+		gd->env_valid = ENV_VALID;
+		return env_import((char *)tmp_env1, 1);
+	} else if (buf1_read_fail && !buf2_read_fail) {
+		gd->env_valid = ENV_REDUND;
+		return env_import((char *)tmp_env2, 1);
+	}
+
 	crc1_ok = crc32(0, tmp_env1->data, ENV_SIZE) ==
 			tmp_env1->crc;
 	crc2_ok = crc32(0, tmp_env2->data, ENV_SIZE) ==

env/mmc.c

@@ -290,27 +290,8 @@ static int env_mmc_load(void)
 	read1_fail = read_env(mmc, CONFIG_ENV_SIZE, offset1, tmp_env1);
 	read2_fail = read_env(mmc, CONFIG_ENV_SIZE, offset2, tmp_env2);
 
-	if (read1_fail && read2_fail)
+	ret = env_import_redund((char *)tmp_env1, read1_fail, (char *)tmp_env2,
-		puts("*** Error - No Valid Environment Area found\n");
+				read2_fail);
-	else if (read1_fail || read2_fail)
-		puts("*** Warning - some problems detected "
-		     "reading environment; recovered successfully\n");
-
-	if (read1_fail && read2_fail) {
-		errmsg = "!bad CRC";
-		ret = -EIO;
-		goto fini;
-	} else if (!read1_fail && read2_fail) {
-		gd->env_valid = ENV_VALID;
-		env_import((char *)tmp_env1, 1);
-	} else if (read1_fail && !read2_fail) {
-		gd->env_valid = ENV_REDUND;
-		env_import((char *)tmp_env2, 1);
-	} else {
-		env_import_redund((char *)tmp_env1, (char *)tmp_env2);
-	}
-
-	ret = 0;
 
 fini:
 	fini_mmc_for_env(mmc);

env/nand.c

@@ -320,7 +320,7 @@ static int env_nand_load(void)
 #if defined(ENV_IS_EMBEDDED)
 	return 0;
 #else
-	int read1_fail = 0, read2_fail = 0;
+	int read1_fail, read2_fail;
 	env_t *tmp_env1, *tmp_env2;
 	int ret = 0;
 
@@ -336,24 +336,8 @@ static int env_nand_load(void)
 	read1_fail = readenv(CONFIG_ENV_OFFSET, (u_char *) tmp_env1);
 	read2_fail = readenv(CONFIG_ENV_OFFSET_REDUND, (u_char *) tmp_env2);
 
-	if (read1_fail && read2_fail)
+	ret = env_import_redund((char *)tmp_env1, read1_fail, (char *)tmp_env2,
-		puts("*** Error - No Valid Environment Area found\n");
+				read2_fail);
-	else if (read1_fail || read2_fail)
-		puts("*** Warning - some problems detected "
-		     "reading environment; recovered successfully\n");
-
-	if (read1_fail && read2_fail) {
-		set_default_env("!bad env area");
-		goto done;
-	} else if (!read1_fail && read2_fail) {
-		gd->env_valid = ENV_VALID;
-		env_import((char *)tmp_env1, 1);
-	} else if (read1_fail && !read2_fail) {
-		gd->env_valid = ENV_REDUND;
-		env_import((char *)tmp_env2, 1);
-	} else {
-		env_import_redund((char *)tmp_env1, (char *)tmp_env2);
-	}
 
 done:
 	free(tmp_env1);

env/ubi.c

@@ -95,6 +95,7 @@ static int env_ubi_load(void)
 {
 	ALLOC_CACHE_ALIGN_BUFFER(char, env1_buf, CONFIG_ENV_SIZE);
 	ALLOC_CACHE_ALIGN_BUFFER(char, env2_buf, CONFIG_ENV_SIZE);
+	int read1_fail, read2_fail;
 	env_t *tmp_env1, *tmp_env2;
 
 	/*
@@ -118,21 +119,20 @@ static int env_ubi_load(void)
 		return -EIO;
 	}
 
-	if (ubi_volume_read(CONFIG_ENV_UBI_VOLUME, (void *)tmp_env1,
+	read1_fail = ubi_volume_read(CONFIG_ENV_UBI_VOLUME, (void *)tmp_env1,
-			    CONFIG_ENV_SIZE)) {
+				     CONFIG_ENV_SIZE);
+	if (read1_fail)
 		printf("\n** Unable to read env from %s:%s **\n",
 		       CONFIG_ENV_UBI_PART, CONFIG_ENV_UBI_VOLUME);
-	}
 
-	if (ubi_volume_read(CONFIG_ENV_UBI_VOLUME_REDUND, (void *)tmp_env2,
+	read2_fail = ubi_volume_read(CONFIG_ENV_UBI_VOLUME_REDUND,
-			    CONFIG_ENV_SIZE)) {
+				     (void *)tmp_env2, CONFIG_ENV_SIZE);
+	if (read2_fail)
 		printf("\n** Unable to read redundant env from %s:%s **\n",
 		       CONFIG_ENV_UBI_PART, CONFIG_ENV_UBI_VOLUME_REDUND);
-	}
 
-	env_import_redund((char *)tmp_env1, (char *)tmp_env2);
+	return env_import_redund((char *)tmp_env1, read1_fail, (char *)tmp_env2,
-
+							 read2_fail);
-	return 0;
 }
 #else /* ! CONFIG_SYS_REDUNDAND_ENVIRONMENT */
 static int env_ubi_load(void)

include/environment.h

@@ -297,7 +297,8 @@ int env_export(env_t *env_out);
 
 #ifdef CONFIG_SYS_REDUNDAND_ENVIRONMENT
 /* Select and import one of two redundant environments */
-int env_import_redund(const char *buf1, const char *buf2);
+int env_import_redund(const char *buf1, int buf1_status,
+		      const char *buf2, int buf2_status);
 #endif
 
 /**