tree 3459953655d71ed43cedd3ecdc9fe637b7960bd0
parent 70bc126471af30bb115e635512dcf6d86fe6e29a
author Peter Hurley <peter@hurleysoftware.com> 1362576053 -0500
committer Greg Kroah-Hartman <gregkh@linuxfoundation.org> 1363648319 -0700

n_tty: Fix stuck throttled driver

As noted in the following comment:

  /* FIXME: there is a tiny race here if the receive room check runs
     before the other work executes and empties the buffer (upping
     the receiving room and unthrottling. We then throttle and get
     stuck. This has been observed and traced down by Vincent Pillet/
     We need to address this when we sort out out the rx path locking */

Use new safe throttle/unthrottle functions to re-evaluate conditions
if interrupted by the complement flow control function.

Reported-by: Vincent Pillet <vincentx.pillet@intel.com>
Signed-off-by: Peter Hurley <peter@hurleysoftware.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>