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| author | Bill Pemberton <wfp5p@virginia.edu> | 2013-03-13 09:50:15 -0400 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2013-03-13 12:32:47 -0700 |
| commit | 27b351c5546008c640b3e65152f60ca74b3706f1 (patch) | |
| tree | 766c1d602d3942be6ba24086c7752926f70197c5 | |
| parent | 3f8bc5e4da29c7e05edeca6b475abb4fb01a5a13 (diff) | |
| download | linux-27b351c5546008c640b3e65152f60ca74b3706f1.tar.gz linux-27b351c5546008c640b3e65152f60ca74b3706f1.tar.bz2 linux-27b351c5546008c640b3e65152f60ca74b3706f1.zip | |
USB: quatech2: only write to the tty if the port is open.
The commit 2e124b4a390ca85325fae75764bef92f0547fa25 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>
| -rw-r--r-- | drivers/usb/serial/quatech2.c | 7 |
1 files changed, 5 insertions, 2 deletions
diff --git a/drivers/usb/serial/quatech2.c b/drivers/usb/serial/quatech2.c index 00e6c9bac8a3..d643a4d4d770 100644 --- a/drivers/usb/serial/quatech2.c +++ b/drivers/usb/serial/quatech2.c @@ -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) |