From ccb8a2203755c7e79811b2b40a90e7e771254b0c Mon Sep 17 00:00:00 2001
From: Harald Welte <laforge@gnumonks.org>
Date: Sun, 20 Mar 2016 13:37:11 +0100
Subject: [PATCH] card_emu: Avoid PTS related race-condition

We should not set the new Fi/Di values before we actually transmitted
the PTSS PCK at the old baud rate first.
---
 firmware/src_simtrace/card_emu.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/firmware/src_simtrace/card_emu.c b/firmware/src_simtrace/card_emu.c
index 8454bc12..5f0ee7ca 100644
--- a/firmware/src_simtrace/card_emu.c
+++ b/firmware/src_simtrace/card_emu.c
@@ -364,7 +364,7 @@ from_pts3:
 }
 
 
-static enum iso7816_3_card_state
+static int
 process_byte_pts(struct card_handle *ch, uint8_t byte)
 {
 	switch (ch->pts.state) {
@@ -406,6 +406,7 @@ process_byte_pts(struct card_handle *ch, uint8_t byte)
 		flush_pts(ch);
 		/* activate UART TX to transmit PTS response */
 		card_emu_uart_enable(ch->uart_chan, ENABLE_TX);
+		return -1;
 	}
 
 	return ISO_S_IN_PTS;