tty: Add fasync() hung up file operation

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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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Peter Hurley 2016-01-09 21:45:10 -08:00 • committed by Greg Kroah-Hartman

parent bee6741ca0

commit f557474ca3

1 changed files with 6 additions and 0 deletions

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6

drivers/tty/tty_io.c

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