From 30af7fb5a40f8724c130428473edffa73170e04c Mon Sep 17 00:00:00 2001 From: Johan Hovold Date: Wed, 17 Mar 2010 23:00:42 +0100 Subject: [PATCH] USB: serial: fix generic chars_in_buffer Make sure chars_in_buffer accounts also for data in host stack queues. This fixes the problem with tty_wait_until_sent returning too soon at close which could cause the final write urb to be cancelled. Reported-by: Pete Zaitcev Signed-off-by: Johan Hovold Signed-off-by: Greg Kroah-Hartman --- drivers/usb/serial/generic.c | 15 +++++++++++---- 1 file changed, 11 insertions(+), 4 deletions(-) diff --git a/drivers/usb/serial/generic.c b/drivers/usb/serial/generic.c index a5e610976689..8f78d7b8e888 100644 --- a/drivers/usb/serial/generic.c +++ b/drivers/usb/serial/generic.c @@ -309,10 +309,14 @@ static int usb_serial_generic_write_start(struct usb_serial_port *port) /* don't have to grab the lock here, as we will retry if != 0 */ port->write_urb_busy = 0; - } else - result = count; + return result; + } - return result; + spin_lock_irqsave(&port->lock, flags); + port->tx_bytes_flight += count; + spin_unlock_irqrestore(&port->lock, flags); + + return count; } /** @@ -400,7 +404,7 @@ int usb_serial_generic_chars_in_buffer(struct tty_struct *tty) if (serial->type->max_in_flight_urbs) chars = port->tx_bytes_flight; else - chars = kfifo_len(&port->write_fifo); + chars = kfifo_len(&port->write_fifo) + port->tx_bytes_flight; spin_unlock_irqrestore(&port->lock, flags); dbg("%s - returns %d", __func__, chars); @@ -510,7 +514,10 @@ void usb_serial_generic_write_bulk_callback(struct urb *urb) port->urbs_in_flight = 0; spin_unlock_irqrestore(&port->lock, flags); } else { + spin_lock_irqsave(&port->lock, flags); + port->tx_bytes_flight -= urb->transfer_buffer_length; port->write_urb_busy = 0; + spin_unlock_irqrestore(&port->lock, flags); if (status) kfifo_reset_out(&port->write_fifo); -- 2.39.2