From: Sudip Mukherjee <sudipm.mukherjee@gmail.com>
Date: Fri, 27 Dec 2019 17:44:34 +0000 (+0000)
Subject: tty: always relink the port
X-Git-Url: http://git.maquefel.me/?a=commitdiff_plain;h=273f632912f1b24b642ba5b7eb5022e43a72f3b5;p=linux.git

tty: always relink the port

If the serial device is disconnected and reconnected, it re-enumerates
properly but does not link it. fwiw, linking means just saving the port
index, so allow it always as there is no harm in saving the same value
again even if it tries to relink with the same port.

Fixes: fb2b90014d78 ("tty: link tty and port before configuring it as console")
Reported-by: Kenneth R. Crudup <kenny@panix.com>
Signed-off-by: Sudip Mukherjee <sudipm.mukherjee@gmail.com>
Cc: stable <stable@vger.kernel.org>
Link: https://lore.kernel.org/r/20191227174434.12057-1-sudipm.mukherjee@gmail.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---

diff --git a/drivers/tty/tty_port.c b/drivers/tty/tty_port.c
index 5023c85ebc6e0..044c3cbdcfa40 100644
--- a/drivers/tty/tty_port.c
+++ b/drivers/tty/tty_port.c
@@ -89,8 +89,7 @@ void tty_port_link_device(struct tty_port *port,
 {
 	if (WARN_ON(index >= driver->num))
 		return;
-	if (!driver->ports[index])
-		driver->ports[index] = port;
+	driver->ports[index] = port;
 }
 EXPORT_SYMBOL_GPL(tty_port_link_device);