diff options
| author | Martin Roth <martinroth@google.com> | 2017-01-25 11:00:18 -0700 |
|---|---|---|
| committer | Nico Huber <nico.h@gmx.de> | 2017-01-26 23:49:44 +0100 |
| commit | 0e7a93fa65fcc7949c02ee9ac9a19af7351ee3f0 (patch) | |
| tree | 709b32aec14f169e5f4b142909dcc0f62747c77a /src/drivers/pc80 | |
| parent | 011792415963e19dfe84da25cd3ab1f31bd55b34 (diff) | |
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>
Diffstat (limited to 'src/drivers/pc80')
| -rw-r--r-- | src/drivers/pc80/rtc/mc146818rtc.c | 8 |
1 files changed, 4 insertions, 4 deletions
diff --git a/src/drivers/pc80/rtc/mc146818rtc.c b/src/drivers/pc80/rtc/mc146818rtc.c index 0d36b004a6..a102917d8d 100644 --- a/src/drivers/pc80/rtc/mc146818rtc.c +++ b/src/drivers/pc80/rtc/mc146818rtc.c @@ -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; } |