common/env_nand.c: calculate crc only when readenv was OK

Calculating the checksum of incompletely read data is useless.

Signed-off-by: Phil Sutter <phil.sutter@viprinet.com>
[scottwood@freescale.com: minor formatting fix]
Signed-off-by: Scott Wood <scottwood@freescale.com>

diff --git a/common/env_nand.c b/common/env_nand.c
index 382e8ae..5b69889 100644 (file)
--- a/common/env_nand.c
+++ b/common/env_nand.c
@@ -352,8 +352,10 @@ void env_relocate_spec(void)
                puts("*** Warning - some problems detected "
                     "reading environment; recovered successfully\n");
 
-       crc1_ok = crc32(0, tmp_env1->data, ENV_SIZE) == tmp_env1->crc;
-       crc2_ok = crc32(0, tmp_env2->data, ENV_SIZE) == tmp_env2->crc;
+       crc1_ok = !read1_fail &&
+               (crc32(0, tmp_env1->data, ENV_SIZE) == tmp_env1->crc);
+       crc2_ok = !read2_fail &&
+               (crc32(0, tmp_env2->data, ENV_SIZE) == tmp_env2->crc);
 
        if (!crc1_ok && !crc2_ok) {
                set_default_env("!bad CRC");