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Date: Wed, 29 Oct 2014 09:43:41 -0400
From: Jim Paris <jim@...n.com>
To: Peter Hurley <peter@...leysoftware.com>
Cc: Oliver Neukum <oliver@...kum.org>,
Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
linux-usb@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH v2] cdc-acm: ensure that termios get set when the port is
activated
The driver wasn't properly configuring the hardware for the current
termios settings under all conditions. Ensure that termios are
written to the device when the port is activated.
Signed-off-by: Jim Paris <jim@...n.com>
---
Peter Hurley wrote:
> Yeah, you're right that the cdc-acm driver isn't properly configuring
> the hardware for the current termios settings under all conditions.
>
> But you don't want to do it for every tty open, only for opens
> requiring port initialization, which is what the tty_port->activate()
> method is for (ie., acm_port_activate()).
I moved it to acm_port_activate(), which works fine. Thanks!
acm_tty_set_termios is just moved in this patch, not changed.
Jim
---
drivers/usb/class/cdc-acm.c | 104 ++++++++++++++++++++++----------------------
1 file changed, 53 insertions(+), 51 deletions(-)
diff --git a/drivers/usb/class/cdc-acm.c b/drivers/usb/class/cdc-acm.c
index e934e19f49f5..24077deb737a 100644
--- a/drivers/usb/class/cdc-acm.c
+++ b/drivers/usb/class/cdc-acm.c
@@ -504,6 +504,57 @@ static int acm_tty_open(struct tty_struct *tty, struct file *filp)
return tty_port_open(&acm->port, tty, filp);
}
+static void acm_tty_set_termios(struct tty_struct *tty,
+ struct ktermios *termios_old)
+{
+ struct acm *acm = tty->driver_data;
+ struct ktermios *termios = &tty->termios;
+ struct usb_cdc_line_coding newline;
+ int newctrl = acm->ctrlout;
+
+ newline.dwDTERate = cpu_to_le32(tty_get_baud_rate(tty));
+ newline.bCharFormat = termios->c_cflag & CSTOPB ? 2 : 0;
+ newline.bParityType = termios->c_cflag & PARENB ?
+ (termios->c_cflag & PARODD ? 1 : 2) +
+ (termios->c_cflag & CMSPAR ? 2 : 0) : 0;
+ switch (termios->c_cflag & CSIZE) {
+ case CS5:
+ newline.bDataBits = 5;
+ break;
+ case CS6:
+ newline.bDataBits = 6;
+ break;
+ case CS7:
+ newline.bDataBits = 7;
+ break;
+ case CS8:
+ default:
+ newline.bDataBits = 8;
+ break;
+ }
+ /* FIXME: Needs to clear unsupported bits in the termios */
+ acm->clocal = ((termios->c_cflag & CLOCAL) != 0);
+
+ if (!newline.dwDTERate) {
+ newline.dwDTERate = acm->line.dwDTERate;
+ newctrl &= ~ACM_CTRL_DTR;
+ } else
+ newctrl |= ACM_CTRL_DTR;
+
+ if (newctrl != acm->ctrlout)
+ acm_set_control(acm, acm->ctrlout = newctrl);
+
+ if (memcmp(&acm->line, &newline, sizeof newline)) {
+ memcpy(&acm->line, &newline, sizeof newline);
+ dev_dbg(&acm->control->dev, "%s - set line: %d %d %d %d\n",
+ __func__,
+ le32_to_cpu(newline.dwDTERate),
+ newline.bCharFormat, newline.bParityType,
+ newline.bDataBits);
+ acm_set_line(acm, &acm->line);
+ }
+}
+
static void acm_port_dtr_rts(struct tty_port *port, int raise)
{
struct acm *acm = container_of(port, struct acm, port);
@@ -554,6 +605,8 @@ static int acm_port_activate(struct tty_port *port, struct tty_struct *tty)
goto error_submit_urb;
}
+ acm_tty_set_termios(tty, NULL);
+
/*
* Unthrottle device in case the TTY was closed while throttled.
*/
@@ -949,57 +1002,6 @@ static int acm_tty_ioctl(struct tty_struct *tty,
return rv;
}
-static void acm_tty_set_termios(struct tty_struct *tty,
- struct ktermios *termios_old)
-{
- struct acm *acm = tty->driver_data;
- struct ktermios *termios = &tty->termios;
- struct usb_cdc_line_coding newline;
- int newctrl = acm->ctrlout;
-
- newline.dwDTERate = cpu_to_le32(tty_get_baud_rate(tty));
- newline.bCharFormat = termios->c_cflag & CSTOPB ? 2 : 0;
- newline.bParityType = termios->c_cflag & PARENB ?
- (termios->c_cflag & PARODD ? 1 : 2) +
- (termios->c_cflag & CMSPAR ? 2 : 0) : 0;
- switch (termios->c_cflag & CSIZE) {
- case CS5:
- newline.bDataBits = 5;
- break;
- case CS6:
- newline.bDataBits = 6;
- break;
- case CS7:
- newline.bDataBits = 7;
- break;
- case CS8:
- default:
- newline.bDataBits = 8;
- break;
- }
- /* FIXME: Needs to clear unsupported bits in the termios */
- acm->clocal = ((termios->c_cflag & CLOCAL) != 0);
-
- if (!newline.dwDTERate) {
- newline.dwDTERate = acm->line.dwDTERate;
- newctrl &= ~ACM_CTRL_DTR;
- } else
- newctrl |= ACM_CTRL_DTR;
-
- if (newctrl != acm->ctrlout)
- acm_set_control(acm, acm->ctrlout = newctrl);
-
- if (memcmp(&acm->line, &newline, sizeof newline)) {
- memcpy(&acm->line, &newline, sizeof newline);
- dev_dbg(&acm->control->dev, "%s - set line: %d %d %d %d\n",
- __func__,
- le32_to_cpu(newline.dwDTERate),
- newline.bCharFormat, newline.bParityType,
- newline.bDataBits);
- acm_set_line(acm, &acm->line);
- }
-}
-
static const struct tty_port_operations acm_port_ops = {
.dtr_rts = acm_port_dtr_rts,
.shutdown = acm_port_shutdown,
--
2.1.0
--
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