tree eeba9a7cacf8a5a14500af01eaf626839655a480
parent d4855e1fc03c2bb32dd64badf51cec5a2a26ab2a
author Peter Hurley <peter@hurleysoftware.com> 1383850917 -0500
committer Greg Kroah-Hartman <gregkh@linuxfoundation.org> 1385399869 -0800

n_tty: Protect minimum_to_wake reset for concurrent readers

With multiple, concurrent readers (each waiting to acquire the
atomic_read_lock mutex), a departing reader may mistakenly reset
minimum_to_wake after a new reader has already set a new value.

Protect the minimum_to_wake reset with the atomic_read_lock critical
section.

Signed-off-by: Peter Hurley <peter@hurleysoftware.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>