Peter Hurley f557474ca3
tty: Add fasync() hung up file operation ...
VFS uses a two-stage check-and-call method for invoking file_operations
methods, without explicitly snapshotting either the file_operations ptr
or the function ptr. Since the tty core is one of the few VFS users that
changes the f_op file_operations ptr of the file descriptor (when the
tty has been hung up), and since the likelihood of the compiler generating
a reload of either f_op or the function ptr is basically nil, just define
a hung up fasync() file operation that returns an error.
Signed-off-by: Peter Hurley <peter@hurleysoftware.com >
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org >
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f557474ca3