NFC: digital: Handle multiple SENSF_REQ frames

According to section 5.15.1.3 of the NFC Activity
Specification, multiple SENSF_REQ commands can be
received by a target before it receives an ATR_REQ
command.  To handle this, add a routine that checks
whether a SENSF_REQ or ATR_REQ has been recieved.
If its a SENSF_REQ, respond appropriately and
continue waiting for a ATR_REQ.  If its an ATR_REQ,
handle it as before.

CC: Thierry Escande <thierry.escande@linux.intel.com>
Signed-off-by: Mark A. Greer <mgreer@animalcreek.com>
Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>

1 files changed, 13 insertions, 1 deletions

diff --git a/net/nfc/digital_technology.c b/net/nfc/digital_technology.c
index c8dfb1b90fa0..12a233e9ece5 100644
--- a/net/nfc/digital_technology.c
+++ b/net/nfc/digital_technology.c
@@ -1091,6 +1091,18 @@ exit:
         dev_kfree_skb(resp);
 }
 
+static void digital_tg_recv_atr_or_sensf_req(struct nfc_digital_dev *ddev,
+                void *arg, struct sk_buff *resp)
+{
+        if (!IS_ERR(resp) && (resp->len >= 2) &&
+                        (resp->data[1] == DIGITAL_CMD_SENSF_REQ))
+                digital_tg_recv_sensf_req(ddev, arg, resp);
+        else
+                digital_tg_recv_atr_req(ddev, arg, resp);
+
+        return;
+}
+
 static int digital_tg_send_sensf_res(struct nfc_digital_dev *ddev,
                               struct digital_sensf_req *sensf_req)
 {
@@ -1136,7 +1148,7 @@ static int digital_tg_send_sensf_res(struct nfc_digital_dev *ddev,
                 digital_skb_add_crc_f(skb);
 
         rc = digital_tg_send_cmd(ddev, skb, 300,
-                                 digital_tg_recv_atr_req, NULL);
+                                 digital_tg_recv_atr_or_sensf_req, NULL);
         if (rc)
                 kfree_skb(skb);