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USB: quatech2: only write to the tty if the port is open. 

The commit 2e124b4a39 removed the checks
that prevented qt2_process_read_urb() from trying to put chars into
ttys that weren't actually opened.  This resulted in 'tty is NULL'
warnings from flush_to_ldisc() when the device was used.

The devices use just one read urb for all ports.  As a result
qt2_process_read_urb() may be called with the current port set to a
port number that has not been opened.  Add a check if the port is open
before calling tty_flip_buffer_push().

Signed-off-by: Bill Pemberton <wfp5p@virginia.edu>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Bill Pemberton 2013-03-13 09:50:15 -04:00 committed by Greg Kroah-Hartman
parent 3f8bc5e4da
commit 27b351c554
1 changed files with 5 additions and 2 deletions
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7
drivers/usb/serial/quatech2.c
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@ -661,7 +661,9 @@ void qt2_process_read_urb(struct urb *urb)
__func__);
break;
}
tty_flip_buffer_push(&port->port);
if (port_priv->is_open)
tty_flip_buffer_push(&port->port);
newport = *(ch + 3);
@ -704,7 +706,8 @@ void qt2_process_read_urb(struct urb *urb)
tty_insert_flip_string(&port->port, ch, 1);
}
tty_flip_buffer_push(&port->port);
if (port_priv->is_open)
tty_flip_buffer_push(&port->port);
}
static void qt2_write_bulk_callback(struct urb *urb)