tty: Replace ASYNC_NORMAL_ACTIVE bit and update atomically

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Replace ASYNC_NORMAL_ACTIVE bit in the tty_port::flags field with
TTY_PORT_ACTIVE bit in the tty_port::iflags field. Introduce helpers
tty_port_set_active() and tty_port_active() to abstract atomic bit ops.

Extract state changes from port lock sections, as this usage is
broken and confused; the state transitions are protected by the
tty lock (which mutually excludes parallel open/close/hangup),
and no user tests the active state while holding the port lock.

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

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Peter Hurley 2016-04-09 17:53:22 -07:00 • committed by Greg Kroah-Hartman

parent 5604a98e2f

commit 807c8d81f4

11 changed files with 53 additions and 42 deletions

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include/linux/tty.h

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