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serial: core: Fix port mutex assert if lockdep disabled

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commit 4047b37122 ("serial: core: Prevent unsafe uart port access,
part 1") added lockdep assertion for port mutex but fails to check
if debug_locks has disabled lockdep (so lock state is no longer
reliable).

Use lockdep_assert_held() instead, which properly checks lockdep
state as well.

Reported-by: Tony Lindgren <tony@atomide.com>
Signed-off-by: Peter Hurley <peter@hurleysoftware.com>
Tested-by: Tony Lindgren <tony@atomide.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Peter Hurley 2016-05-03 14:01:51 -07:00 committed by Greg Kroah-Hartman
parent 6550be9f62
commit 7da4b8b737
1 changed files with 1 additions and 3 deletions
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4
drivers/tty/serial/serial_core.c
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@ -95,9 +95,7 @@ static inline void uart_port_deref(struct uart_port *uport)
static inline struct uart_port *uart_port_check(struct uart_state *state)
{
#ifdef CONFIG_LOCKDEP
WARN_ON(!lockdep_is_held(&state->port.mutex));
#endif
lockdep_assert_held(&state->port.mutex);
return state->uart_port;
}