| From | Greg Kroah-Hartman <> | Subject | [PATCH 4.4 21/48] USB: serial: ch341: fix open and resume after B0 | Date | Wed, 18 Jan 2017 11:46:30 +0100 |
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4.4-stable review patch. If anyone has any objections, please let me know.
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From: Johan Hovold <johan@kernel.org>
commit a20047f36e2f6a1eea4f1fd261aaa55882369868 upstream.
The private baud_rate variable is used to configure the port at open and reset-resume and must never be set to (and left at) zero or reset-resume and all further open attempts will fail.
Fixes: aa91def41a7b ("USB: ch341: set tty baud speed according to tty struct") Fixes: 664d5df92e88 ("USB: usb-serial ch341: support for DTR/RTS/CTS") Signed-off-by: Johan Hovold <johan@kernel.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
--- drivers/usb/serial/ch341.c | 3 +-- 1 file changed, 1 insertion(+), 2 deletions(-)
--- a/drivers/usb/serial/ch341.c +++ b/drivers/usb/serial/ch341.c @@ -361,12 +361,11 @@ static void ch341_set_termios(struct tty baud_rate = tty_get_baud_rate(tty); - priv->baud_rate = baud_rate; - if (baud_rate) { spin_lock_irqsave(&priv->lock, flags); priv->line_control |= (CH341_BIT_DTR | CH341_BIT_RTS); spin_unlock_irqrestore(&priv->lock, flags); + priv->baud_rate = baud_rate; ch341_set_baudrate(port->serial->dev, priv); } else { spin_lock_irqsave(&priv->lock, flags);
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