Linux-libre 4.8.2-gnupck-4.8.2-gnu

1 files changed, 76 insertions, 6 deletions

diff --git a/drivers/nfc/port100.c b/drivers/nfc/port100.c
index 87d509996..2b2330b23 100644
--- a/drivers/nfc/port100.c
+++ b/drivers/nfc/port100.c
@@ -343,7 +343,26 @@ in_protocols[][PORT100_IN_MAX_NUM_PROTOCOLS + 1] = {
 	},
 	[NFC_DIGITAL_FRAMING_NFCF_NFC_DEP] = {
 		/* nfc_digital_framing_nfcf */
-		{ PORT100_IN_PROT_END, 0 },
+		{ PORT100_IN_PROT_INITIAL_GUARD_TIME,     18 },
+		{ PORT100_IN_PROT_ADD_CRC,                 1 },
+		{ PORT100_IN_PROT_CHECK_CRC,               1 },
+		{ PORT100_IN_PROT_MULTI_CARD,              0 },
+		{ PORT100_IN_PROT_ADD_PARITY,              0 },
+		{ PORT100_IN_PROT_CHECK_PARITY,            0 },
+		{ PORT100_IN_PROT_BITWISE_AC_RECV_MODE,    0 },
+		{ PORT100_IN_PROT_VALID_BIT_NUMBER,        8 },
+		{ PORT100_IN_PROT_CRYPTO1,                 0 },
+		{ PORT100_IN_PROT_ADD_SOF,                 0 },
+		{ PORT100_IN_PROT_CHECK_SOF,               0 },
+		{ PORT100_IN_PROT_ADD_EOF,                 0 },
+		{ PORT100_IN_PROT_CHECK_EOF,               0 },
+		{ PORT100_IN_PROT_DEAF_TIME,               4 },
+		{ PORT100_IN_PROT_CRM,                     0 },
+		{ PORT100_IN_PROT_CRM_MIN_LEN,             0 },
+		{ PORT100_IN_PROT_T1_TAG_FRAME,            0 },
+		{ PORT100_IN_PROT_RFCA,                    0 },
+		{ PORT100_IN_PROT_GUARD_TIME_AT_INITIATOR, 6 },
+		{ PORT100_IN_PROT_END,                     0 },
 	},
 	[NFC_DIGITAL_FRAMING_NFC_DEP_ACTIVATED] = {
 		{ PORT100_IN_PROT_END, 0 },
@@ -437,6 +456,12 @@ struct port100 {
 	struct urb *out_urb;
 	struct urb *in_urb;
 
+	/* This mutex protects the out_urb and avoids to submit a new command
+	 * through port100_send_frame_async() while the previous one is being
+	 * canceled through port100_abort_cmd().
+	 */
+	struct mutex out_urb_lock;
+
 	struct work_struct cmd_complete_work;
 
 	u8 cmd_type;
@@ -445,6 +470,9 @@ struct port100 {
 	 * for any queuing/locking mechanism at driver level.
 	 */
 	struct port100_cmd *cmd;
+
+	bool cmd_cancel;
+	struct completion cmd_cancel_done;
 };
 
 struct port100_cmd {
@@ -699,10 +727,27 @@ static int port100_send_ack(struct port100 *dev)
 {
 	int rc;
 
+	mutex_lock(&dev->out_urb_lock);
+
+	init_completion(&dev->cmd_cancel_done);
+
+	usb_kill_urb(dev->out_urb);
+
 	dev->out_urb->transfer_buffer = ack_frame;
 	dev->out_urb->transfer_buffer_length = sizeof(ack_frame);
 	rc = usb_submit_urb(dev->out_urb, GFP_KERNEL);
 
+	/* Set the cmd_cancel flag only if the URB has been successfully
+	 * submitted. It will be reset by the out URB completion callback
+	 * port100_send_complete().
+	 */
+	dev->cmd_cancel = !rc;
+
+	mutex_unlock(&dev->out_urb_lock);
+
+	if (!rc)
+		wait_for_completion(&dev->cmd_cancel_done);
+
 	return rc;
 }
 
@@ -711,6 +756,16 @@ static int port100_send_frame_async(struct port100 *dev, struct sk_buff *out,
 {
 	int rc;
 
+	mutex_lock(&dev->out_urb_lock);
+
+	/* A command cancel frame as been sent through dev->out_urb. Don't try
+	 * to submit a new one.
+	 */
+	if (dev->cmd_cancel) {
+		rc = -EAGAIN;
+		goto exit;
+	}
+
 	dev->out_urb->transfer_buffer = out->data;
 	dev->out_urb->transfer_buffer_length = out->len;
 
@@ -722,16 +777,15 @@ static int port100_send_frame_async(struct port100 *dev, struct sk_buff *out,
 
 	rc = usb_submit_urb(dev->out_urb, GFP_KERNEL);
 	if (rc)
-		return rc;
+		goto exit;
 
 	rc = port100_submit_urb_for_ack(dev, GFP_KERNEL);
 	if (rc)
-		goto error;
+		usb_unlink_urb(dev->out_urb);
 
-	return 0;
+exit:
+	mutex_unlock(&dev->out_urb_lock);
 
-error:
-	usb_unlink_urb(dev->out_urb);
 	return rc;
 }
 
@@ -790,6 +844,12 @@ static int port100_send_cmd_async(struct port100 *dev, u8 cmd_code,
 			PORT100_FRAME_MAX_PAYLOAD_LEN +
 			PORT100_FRAME_TAIL_LEN;
 
+	if (dev->cmd) {
+		nfc_err(&dev->interface->dev,
+			"A command is still in process\n");
+		return -EBUSY;
+	}
+
 	resp = alloc_skb(resp_len, GFP_KERNEL);
 	if (!resp)
 		return -ENOMEM;
@@ -867,6 +927,11 @@ static void port100_send_complete(struct urb *urb)
 {
 	struct port100 *dev = urb->context;
 
+	if (dev->cmd_cancel) {
+		dev->cmd_cancel = false;
+		complete(&dev->cmd_cancel_done);
+	}
+
 	switch (urb->status) {
 	case 0:
 		break; /* success */
@@ -985,6 +1050,10 @@ static int port100_switch_rf(struct nfc_digital_dev *ddev, bool on)
 
 	*skb_put(skb, 1) = on ? 1 : 0;
 
+	/* Cancel the last command if the device is being switched off */
+	if (!on)
+		port100_abort_cmd(ddev);
+
 	resp = port100_send_cmd_sync(dev, PORT100_CMD_SWITCH_RF, skb);
 
 	if (IS_ERR(resp))
@@ -1430,6 +1499,7 @@ static int port100_probe(struct usb_interface *interface,
 	if (!dev)
 		return -ENOMEM;
 
+	mutex_init(&dev->out_urb_lock);
 	dev->udev = usb_get_dev(interface_to_usbdev(interface));
 	dev->interface = interface;
 	usb_set_intfdata(interface, dev);