From: Seth Bollinger <sethb@digi.com>
Date: Tue, 25 Mar 2014 17:55:37 +0000 (-0500)
Subject: serial_core: Fix conditional start_tx on ring buffer not empty
X-Git-Tag: omap-for-v3.16/pm-signed~81^2~14
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=717f3bbab3c7628736ef738fdbf3d9a28578c26c;p=pandora-kernel.git

serial_core: Fix conditional start_tx on ring buffer not empty

If the serial_core ring buffer empties just as the tty layer receives
an XOFF, then start_tx will never be called when the tty layer
receives an XON as the serial_core ring buffer is empty.  This will
possibly leave a few bytes trapped in the fifo for drivers that
disable the transmitter when flow controlled.

Signed-off-by: Seth Bollinger <sethb@digi.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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