diff mbox series

[5.8,137/232] USB: serial: ftdi_sio: fix break and sysrq handling

Message ID 20200820091619.460392380@linuxfoundation.org
State Superseded
Headers show
Series None | expand

Commit Message

Greg Kroah-Hartman Aug. 20, 2020, 9:19 a.m. UTC 
From: Johan Hovold <johan@kernel.org>

[ Upstream commit 733fff67941dad64b8a630450b8372b1873edc41 ]

Only the last NUL in a packet should be flagged as a break character,
for example, to avoid dropping unrelated characters when IGNBRK is set.

Also make sysrq work by consuming the break character instead of having
it immediately cancel the sysrq request, and by not processing it
prematurely to avoid triggering a sysrq based on an unrelated character
received in the same packet (which was received *before* the break).

Note that the break flag can be left set also for a packet received
immediately following a break and that and an ending NUL in such a
packet will continue to be reported as a break as there's no good way to
tell it apart from an actual break.

Tested on FT232R and FT232H.

Fixes: 72fda3ca6fc1 ("USB: serial: ftd_sio: implement sysrq handling on break")
Fixes: 1da177e4c3f4 ("Linux-2.6.12-rc2")
Reviewed-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Johan Hovold <johan@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
 drivers/usb/serial/ftdi_sio.c | 24 +++++++++++++++++-------
 1 file changed, 17 insertions(+), 7 deletions(-)

Comments

Johan Hovold Aug. 20, 2020, 9:51 a.m. UTC | #1 
This was never intended for stable as it is not a critical fix and has
never worked properly in the first place. Please drop this one and the
preparatory clean ups from all stable trees.

Johan
Greg Kroah-Hartman Aug. 20, 2020, 9:56 a.m. UTC | #2 
On Thu, Aug 20, 2020 at 11:51:56AM +0200, Johan Hovold wrote:
> This was never intended for stable as it is not a critical fix and has
> never worked properly in the first place. Please drop this one and the
> preparatory clean ups from all stable trees.

Ok, but the "fix this thing" and the "Fixes:" tag really did imply this
was actually fixing something :)

I'll drop it from everywhere, thanks.

greg k-h
diff mbox series

Patch

diff --git a/drivers/usb/serial/ftdi_sio.c b/drivers/usb/serial/ftdi_sio.c
index 33f1cca7eaa61..07b146d7033a6 100644
--- a/drivers/usb/serial/ftdi_sio.c
+++ b/drivers/usb/serial/ftdi_sio.c
@@ -2483,6 +2483,7 @@  static int ftdi_process_packet(struct usb_serial_port *port,
 		struct ftdi_private *priv, unsigned char *buf, int len)
 {
 	unsigned char status;
+	bool brkint = false;
 	int i;
 	char flag;
 
@@ -2534,13 +2535,17 @@  static int ftdi_process_packet(struct usb_serial_port *port,
 	 */
 	flag = TTY_NORMAL;
 	if (buf[1] & FTDI_RS_ERR_MASK) {
-		/* Break takes precedence over parity, which takes precedence
-		 * over framing errors */
-		if (buf[1] & FTDI_RS_BI) {
-			flag = TTY_BREAK;
+		/*
+		 * Break takes precedence over parity, which takes precedence
+		 * over framing errors. Note that break is only associated
+		 * with the last character in the buffer and only when it's a
+		 * NUL.
+		 */
+		if (buf[1] & FTDI_RS_BI && buf[len - 1] == '\0') {
 			port->icount.brk++;
-			usb_serial_handle_break(port);
-		} else if (buf[1] & FTDI_RS_PE) {
+			brkint = true;
+		}
+		if (buf[1] & FTDI_RS_PE) {
 			flag = TTY_PARITY;
 			port->icount.parity++;
 		} else if (buf[1] & FTDI_RS_FE) {
@@ -2556,8 +2561,13 @@  static int ftdi_process_packet(struct usb_serial_port *port,
 
 	port->icount.rx += len - 2;
 
-	if (port->port.console && port->sysrq) {
+	if (brkint || (port->port.console && port->sysrq)) {
 		for (i = 2; i < len; i++) {
+			if (brkint && i == len - 1) {
+				if (usb_serial_handle_break(port))
+					return len - 3;
+				flag = TTY_BREAK;
+			}
 			if (usb_serial_handle_sysrq_char(port, buf[i]))
 				continue;
 			tty_insert_flip_char(&port->port, buf[i], flag);