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-rw-r--r--src/ec/google/chromeec/ec_mec.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/src/ec/google/chromeec/ec_mec.c b/src/ec/google/chromeec/ec_mec.c
index 8a3b852593..5d1ec3c7f3 100644
--- a/src/ec/google/chromeec/ec_mec.c
+++ b/src/ec/google/chromeec/ec_mec.c
@@ -85,7 +85,7 @@ void mec_io_bytes(int write, u16 port, unsigned int length, u8 *buf, u8 *csum)
* Long access cannot be used on misaligned data since reading B0 loads
* the data register and writing B3 flushes it.
*/
- if (port & 0x3)
+ if ((port & 0x3) || (length < 4))
access_mode = ACCESS_TYPE_BYTE;
else
access_mode = ACCESS_TYPE_LONG_AUTO_INCREMENT;