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tty: serial: st-asc: Make the locking RT aware 

The lock is a sleeping lock and local_irq_save() is not the
standard implementation now. Working for both -RT and non
RT.

Signed-off-by: Lionel Debieve <lionel.debieve@st.com>
Acked-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Acked-by: Patrice Chotard <patrice.chotard@st.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Lionel Debieve 2017-03-22 18:12:31 +01:00 committed by Greg Kroah-Hartman
parent 19fa6e601b
commit ef49ffd8b5
1 changed files with 3 additions and 5 deletions
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8
drivers/tty/serial/st-asc.c
View File

@ -887,13 +887,12 @@ static void asc_console_write(struct console *co, const char *s, unsigned count)
int locked = 1;
u32 intenable;
local_irq_save(flags);
if (port->sysrq)
locked = 0; /* asc_interrupt has already claimed the lock */
else if (oops_in_progress)
locked = spin_trylock(&port->lock);
locked = spin_trylock_irqsave(&port->lock, flags);
else
spin_lock(&port->lock);
spin_lock_irqsave(&port->lock, flags);
/*
* Disable interrupts so we don't get the IRQ line bouncing
@ -911,8 +910,7 @@ static void asc_console_write(struct console *co, const char *s, unsigned count)
asc_out(port, ASC_INTEN, intenable);
if (locked)
spin_unlock(&port->lock);
local_irq_restore(flags);
spin_unlock_irqrestore(&port->lock, flags);
}
static int asc_console_setup(struct console *co, char *options)