[PATCH 1/6] USB: serial: cp210x: fix control-characters error handling

[PATCH 1/6] USB: serial: cp210x: fix control-characters error handling

[Johan Hovold]

In the unlikely event that setting the software flow-control characters
fails the other flow-control settings should still be updated.

Fixes: 7748feffcd80 ("USB: serial: cp210x: add support for software flow control")
Cc: stable@vger.kernel.org	# 5.11
Signed-off-by: Johan Hovold <johan@kernel.org>
---
 drivers/usb/serial/cp210x.c | 4 +---
 1 file changed, 1 insertion(+), 3 deletions(-)

diff --git a/drivers/usb/serial/cp210x.c b/drivers/usb/serial/cp210x.c
index 09b845d0da41..b41e2c7649fb 100644
--- a/drivers/usb/serial/cp210x.c
+++ b/drivers/usb/serial/cp210x.c
@@ -1217,9 +1217,7 @@ static void cp210x_set_flow_control(struct tty_struct *tty,
 		chars.bXonChar = START_CHAR(tty);
 		chars.bXoffChar = STOP_CHAR(tty);
 
-		ret = cp210x_set_chars(port, &chars);
-		if (ret)
-			return;
+		cp210x_set_chars(port, &chars);
 	}
 
 	mutex_lock(&port_priv->mutex);
-- 
2.31.1

[PATCH 2/6] USB: serial: cp210x: fix flow-control error handling

[Johan Hovold]

Make sure that the driver crtscts state is not updated in the unlikely
event that the flow-control request fails. Not doing so could break RTS
control.

Fixes: 5951b8508855 ("USB: serial: cp210x: suppress modem-control errors")
Cc: stable@vger.kernel.org	# 5.11
Signed-off-by: Johan Hovold <johan@kernel.org>
---
 drivers/usb/serial/cp210x.c | 11 ++++++++---
 1 file changed, 8 insertions(+), 3 deletions(-)

diff --git a/drivers/usb/serial/cp210x.c b/drivers/usb/serial/cp210x.c
index b41e2c7649fb..eb3be4f65603 100644
--- a/drivers/usb/serial/cp210x.c
+++ b/drivers/usb/serial/cp210x.c
@@ -1191,6 +1191,7 @@ static void cp210x_set_flow_control(struct tty_struct *tty,
 	struct cp210x_flow_ctl flow_ctl;
 	u32 flow_repl;
 	u32 ctl_hs;
+	bool crtscts;
 	int ret;
 
 	/*
@@ -1246,14 +1247,14 @@ static void cp210x_set_flow_control(struct tty_struct *tty,
 			flow_repl |= CP210X_SERIAL_RTS_FLOW_CTL;
 		else
 			flow_repl |= CP210X_SERIAL_RTS_INACTIVE;
-		port_priv->crtscts = true;
+		crtscts = true;
 	} else {
 		ctl_hs &= ~CP210X_SERIAL_CTS_HANDSHAKE;
 		if (port_priv->rts)
 			flow_repl |= CP210X_SERIAL_RTS_ACTIVE;
 		else
 			flow_repl |= CP210X_SERIAL_RTS_INACTIVE;
-		port_priv->crtscts = false;
+		crtscts = false;
 	}
 
 	if (I_IXOFF(tty)) {
@@ -1276,8 +1277,12 @@ static void cp210x_set_flow_control(struct tty_struct *tty,
 	flow_ctl.ulControlHandshake = cpu_to_le32(ctl_hs);
 	flow_ctl.ulFlowReplace = cpu_to_le32(flow_repl);
 
-	cp210x_write_reg_block(port, CP210X_SET_FLOW, &flow_ctl,
+	ret = cp210x_write_reg_block(port, CP210X_SET_FLOW, &flow_ctl,
 			sizeof(flow_ctl));
+	if (ret)
+		goto out_unlock;
+
+	port_priv->crtscts = crtscts;
 out_unlock:
 	mutex_unlock(&port_priv->mutex);
 }
-- 
2.31.1

Re: [PATCH 1/6] USB: serial: cp210x: fix control-characters error handling

[Greg KH]

On Fri, Jul 02, 2021 at 03:42:22PM +0200, Johan Hovold wrote:
> In the unlikely event that setting the software flow-control characters
> fails the other flow-control settings should still be updated.
> 
> Fixes: 7748feffcd80 ("USB: serial: cp210x: add support for software flow control")
> Cc: stable@vger.kernel.org	# 5.11
> Signed-off-by: Johan Hovold <johan@kernel.org>
> ---
>  drivers/usb/serial/cp210x.c | 4 +---
>  1 file changed, 1 insertion(+), 3 deletions(-)
> 
> diff --git a/drivers/usb/serial/cp210x.c b/drivers/usb/serial/cp210x.c
> index 09b845d0da41..b41e2c7649fb 100644
> --- a/drivers/usb/serial/cp210x.c
> +++ b/drivers/usb/serial/cp210x.c
> @@ -1217,9 +1217,7 @@ static void cp210x_set_flow_control(struct tty_struct *tty,
>  		chars.bXonChar = START_CHAR(tty);
>  		chars.bXoffChar = STOP_CHAR(tty);
>  
> -		ret = cp210x_set_chars(port, &chars);
> -		if (ret)
> -			return;
> +		cp210x_set_chars(port, &chars);

What's the odds that someone tries to add the error checking back in
here, in a few years?  Can you put a comment here saying why you are not
checking it?

thanks,

greg k-h

Re: [PATCH 1/6] USB: serial: cp210x: fix control-characters error handling

[Johan Hovold]

On Fri, Jul 02, 2021 at 04:47:11PM +0200, Greg Kroah-Hartman wrote:
> On Fri, Jul 02, 2021 at 03:42:22PM +0200, Johan Hovold wrote:
> > In the unlikely event that setting the software flow-control characters
> > fails the other flow-control settings should still be updated.
> > 
> > Fixes: 7748feffcd80 ("USB: serial: cp210x: add support for software flow control")
> > Cc: stable@vger.kernel.org	# 5.11
> > Signed-off-by: Johan Hovold <johan@kernel.org>
> > ---
> >  drivers/usb/serial/cp210x.c | 4 +---
> >  1 file changed, 1 insertion(+), 3 deletions(-)
> > 
> > diff --git a/drivers/usb/serial/cp210x.c b/drivers/usb/serial/cp210x.c
> > index 09b845d0da41..b41e2c7649fb 100644
> > --- a/drivers/usb/serial/cp210x.c
> > +++ b/drivers/usb/serial/cp210x.c
> > @@ -1217,9 +1217,7 @@ static void cp210x_set_flow_control(struct tty_struct *tty,
> >  		chars.bXonChar = START_CHAR(tty);
> >  		chars.bXoffChar = STOP_CHAR(tty);
> >  
> > -		ret = cp210x_set_chars(port, &chars);
> > -		if (ret)
> > -			return;
> > +		cp210x_set_chars(port, &chars);
> 
> What's the odds that someone tries to add the error checking back in
> here, in a few years?  Can you put a comment here saying why you are not
> checking it?

This is just how set_termios() works and how the other requests are
handled by the driver. I can add an explicit error message here though
just like when setting the line-control register so that it doesn't look
like an oversight. The error message is currently printed by the
set_chars() helper, but I can move that out when removing the helper
later in the series.

Johan