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drivers/pc80/rtc: Check cmos checksum BEFORE reading cmos value 

If cmos is invalid, it doesn't make sense to read the value before
finding that out.

Change-Id: Ieb4661aad7e4d640772325c3c6b184de1947edc3
Signed-off-by: Martin Roth <martinroth@google.com>
Reviewed-on: https://review.coreboot.org/18236
Tested-by: build bot (Jenkins)
Reviewed-by: Arthur Heymans <arthur@aheymans.xyz>
Reviewed-by: Paul Menzel <paulepanter@users.sourceforge.net>
This commit is contained in:
Martin Roth 2017-01-25 11:00:18 -07:00 committed by Nico Huber
parent 0117924159
commit 0e7a93fa65
1 changed files with 4 additions and 4 deletions
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8
src/drivers/pc80/rtc/mc146818rtc.c
View File

@ -251,14 +251,14 @@ enum cb_err get_option(void *dest, const char *name)
return CB_CMOS_OPTION_NOT_FOUND;
}
if (get_cmos_value(ce->bit, ce->length, dest) != CB_SUCCESS) {
UNLOCK_NVRAM_CBFS_SPINLOCK();
return CB_CMOS_ACCESS_ERROR;
}
if (!cmos_checksum_valid(LB_CKS_RANGE_START, LB_CKS_RANGE_END, LB_CKS_LOC)) {
UNLOCK_NVRAM_CBFS_SPINLOCK();
return CB_CMOS_CHECKSUM_INVALID;
}
if (get_cmos_value(ce->bit, ce->length, dest) != CB_SUCCESS) {
UNLOCK_NVRAM_CBFS_SPINLOCK();
return CB_CMOS_ACCESS_ERROR;
}
UNLOCK_NVRAM_CBFS_SPINLOCK();
return CB_SUCCESS;
}