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rtc: Do checksum check for all bytes 

Due to missing braces (that went undetected because of the
indentation), I584189d9fcf7c9b831d9c020ee7ed59bb5ae08e8
CMOS: add set_option() only takes the last changed byte into regard
when determining whether the checksum needs to be updated.

This bug went undetected for 5 years.

Change-Id: I47cedc801a60959386dfdcda3a13b8e3162a7ecb
Signed-off-by: Stefan Reinauer <stefan.reinauer@coreboot.org>
Reviewed-on: https://review.coreboot.org/14616
Tested-by: build bot (Jenkins)
Reviewed-by: Paul Menzel <paulepanter@users.sourceforge.net>
Reviewed-by: Martin Roth <martinroth@google.com>
This commit is contained in:
Stefan Reinauer 2016-05-04 16:16:47 -07:00 committed by Martin Roth
parent d5a6eb44ca
commit 24850ccf9b
1 changed files with 3 additions and 2 deletions
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5
src/drivers/pc80/rtc/mc146818rtc.c
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@ -198,7 +198,7 @@ static enum cb_err get_cmos_value(unsigned long bit, unsigned long length,
uchar >>= byte_bit; /* shift the bits to byte align */ uchar >>= byte_bit; /* shift the bits to byte align */
/* clear unspecified bits */ /* clear unspecified bits */
ret[0] = uchar & ((1 << length) - 1); ret[0] = uchar & ((1 << length) - 1);
} else { /* more that one byte so transfer the whole bytes */ } else { /* more than one byte so transfer the whole bytes */
for (i = 0; length; i++, length -= 8, byte++) { for (i = 0; length; i++, length -= 8, byte++) {
/* load the byte */ /* load the byte */
ret[i] = cmos_read(byte); ret[i] = cmos_read(byte);
@ -284,11 +284,12 @@ static enum cb_err set_cmos_value(unsigned long bit, unsigned long length,
if (byte_bit || length % 8) if (byte_bit || length % 8)
return CB_ERR_ARG; return CB_ERR_ARG;
for (i = 0; length; i++, length -= 8, byte++) for (i = 0; length; i++, length -= 8, byte++) {
cmos_write(ret[i], byte); cmos_write(ret[i], byte);
if (byte >= LB_CKS_RANGE_START && if (byte >= LB_CKS_RANGE_START &&
byte <= LB_CKS_RANGE_END) byte <= LB_CKS_RANGE_END)
chksum_update_needed = 1; chksum_update_needed = 1;
}
} }
if (chksum_update_needed) { if (chksum_update_needed) {