From: Alan Cox <alan@linux.intel.com>
Date: Thu, 21 May 2015 23:02:15 +0000 (+0100)
Subject: devtty: update for close semantics
X-Git-Url: https://git.ndcode.org/public/gitweb.cgi?a=commitdiff_plain;h=29cdadbc0948fce95be406af92acb6d822ed146e;p=FUZIX.git

devtty: update for close semantics
---

diff --git a/Kernel/platform-mtx/devtty.c b/Kernel/platform-mtx/devtty.c
index 03c8b846..772b3c7c 100644
--- a/Kernel/platform-mtx/devtty.c
+++ b/Kernel/platform-mtx/devtty.c
@@ -160,6 +160,9 @@ int mtxtty_close(uint8_t minor)
 	irqflags_t flags;
 	int err = tty_close(minor);
 
+	if (tty[minor].users)
+		return 0;
+
 	flags = di();
 	if (minor == 3) {
 		serialAc = 0x05;
diff --git a/Kernel/platform-nc100/devtty.c b/Kernel/platform-nc100/devtty.c
index 8745e0ec..11a46094 100644
--- a/Kernel/platform-nc100/devtty.c
+++ b/Kernel/platform-nc100/devtty.c
@@ -67,6 +67,8 @@ int nc100_tty_open(uint8_t minor, uint16_t flag)
 int nc100_tty_close(uint8_t minor)
 {
 	tty_close(minor);
+	if (tty[minor].users)
+		return 0;
 	if (minor == 2) {
 #ifdef CONFIG_NC200
 		irqen = 0x18;
diff --git a/Kernel/platform-trs80/devtty.c b/Kernel/platform-trs80/devtty.c
index ff6d0750..304406b8 100644
--- a/Kernel/platform-trs80/devtty.c
+++ b/Kernel/platform-trs80/devtty.c
@@ -90,7 +90,7 @@ void tty_setup(uint8_t minor)
 
 int trstty_close(uint8_t minor)
 {
-    if (minor == 2)
+    if (minor == 2 &&ttydata[2].users == 0)
         tr1865_ctrl = 0;	/* Drop carrier */
     return tty_close(minor);
 }