NFC: st21nfca: Improved start of frame detection
A start of frame is 7E 00 not only 7E. Make sure the first read sequence is
starting with 7E 00.
For example: 7E FF FF FF FF is as a correct crc but it is a bad frame.
Signed-off-by: Christophe Ricard <christophe-h.ricard@st.com>
Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>
diff --git a/drivers/nfc/st21nfca/i2c.c b/drivers/nfc/st21nfca/i2c.c
index d10d837..70564b3 100644
--- a/drivers/nfc/st21nfca/i2c.c
+++ b/drivers/nfc/st21nfca/i2c.c
@@ -397,12 +397,11 @@
* The first read sequence does not start with SOF.
* Data is corrupeted so we drop it.
*/
- if (!phy->current_read_len && buf[0] != ST21NFCA_SOF_EOF) {
+ if (!phy->current_read_len && !IS_START_OF_FRAME(buf)) {
skb_trim(skb, 0);
phy->current_read_len = 0;
return -EIO;
- } else if (phy->current_read_len &&
- IS_START_OF_FRAME(buf)) {
+ } else if (phy->current_read_len && IS_START_OF_FRAME(buf)) {
/*
* Previous frame transmission was interrupted and
* the frame got repeated.
