tree 965bb7f33b4c96fd543803d41248c962cb79958e
parent 73f35c60d5c4a98061fc0f94505bf26fd4bb1a1c
author Dan Williams <dcbw@redhat.com> 1290204240 -0600
committer Greg Kroah-Hartman <gregkh@suse.de> 1291164297 -0800

usb-wwan: implement TIOCGSERIAL and TIOCSSERIAL to avoid blocking close(2)

Some devices (ex ZTE 2726) simply don't respond at all when data is sent
to some of their USB interfaces.  The data gets stuck in the TTYs queue
and sits there until close(2), which them blocks because closing_wait
defaults to 30 seconds (even though the fd is O_NONBLOCK).  This is
rarely desired.  Implement the standard mechanism to adjust closing_wait
and let applications handle it how they want to.

Signed-off-by: Dan Williams <dcbw@redhat.com>