From: Peter Hurley <peter@hurleysoftware.com>
Date: Wed, 5 Nov 2014 17:12:55 +0000 (-0500)
Subject: tty: Document check_tty_count() requires tty_lock held
X-Git-Tag: omap-for-v3.19/fixes-rc1~86^2~182
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=deb287e7401bbbf7803731805acbda1d983d1999;p=pandora-kernel.git

tty: Document check_tty_count() requires tty_lock held

Holding the tty_lock() is necessary to prevent concurrent changes
to the tty count that may cause it to differ from the open file
list count. The tty_lock() is already held at all call sites.

NB: Note that the check for the pty master tty count is safe because
the slave's tty_lock() is held while decrementing the pty master
tty count.

Reviewed-by: Alan Cox <alan@linux.intel.com>
Signed-off-by: Peter Hurley <peter@hurleysoftware.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---

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