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mb/siemens/mc_apl1: Simplify is_mac_adr_valid() logic 

A MAC address that is neither 00:00:00:00:00:00 nor ff:ff:ff:ff:ff:ff is
considered valid. Instead of using a temporary buffer and memcmp(), use
a single loop that exits as soon as the MAC cannot possibly be invalid.

Change-Id: I2b15b510092860fbbefd150c9060da38aeb13311
Signed-off-by: Angel Pons <th3fanbus@gmail.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/47405
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Werner Zeh <werner.zeh@siemens.com>
Reviewed-by: Mario Scheithauer <mario.scheithauer@siemens.com>
Reviewed-by: Uwe Poeche <uwe.poeche@siemens.com>
This commit is contained in:
Angel Pons 2020-11-10 17:10:01 +01:00 committed by Patrick Georgi
parent c19a9a5278
commit afb60e7112
1 changed files with 7 additions and 9 deletions
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14
src/mainboard/siemens/mc_apl1/mainboard.c
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@ -35,15 +35,13 @@
*/
static uint8_t is_mac_adr_valid(uint8_t mac[MAC_ADDR_LEN])
{
uint8_t buf[MAC_ADDR_LEN];
memset(buf, 0, sizeof(buf));
if (!memcmp(buf, mac, sizeof(buf)))
return 0;
memset(buf, 0xff, sizeof(buf));
if (!memcmp(buf, mac, sizeof(buf)))
return 0;
for (size_t i = 0; i < MAC_ADDR_LEN; i++) {
if (mac[i] != 0x00 && mac[i] != 0xff)
return 1;
if (mac[i] != mac[0])
return 1;
}
return 0;
}
/** \brief This function will search for a MAC address which can be assigned