summaryrefslogtreecommitdiff
path: root/drivers/tty/serial/fsl_lpuart.c
diff options
context:
space:
mode:
Diffstat (limited to 'drivers/tty/serial/fsl_lpuart.c')
-rw-r--r--drivers/tty/serial/fsl_lpuart.c20
1 files changed, 20 insertions, 0 deletions
diff --git a/drivers/tty/serial/fsl_lpuart.c b/drivers/tty/serial/fsl_lpuart.c
index 20dc8ad3a6cf..3608f8b7f855 100644
--- a/drivers/tty/serial/fsl_lpuart.c
+++ b/drivers/tty/serial/fsl_lpuart.c
@@ -1709,6 +1709,13 @@ lpuart_console_write(struct console *co, const char *s, unsigned int count)
{
struct lpuart_port *sport = lpuart_ports[co->index];
unsigned char old_cr2, cr2;
+ unsigned long flags;
+ int locked = 1;
+
+ if (sport->port.sysrq || oops_in_progress)
+ locked = spin_trylock_irqsave(&sport->port.lock, flags);
+ else
+ spin_lock_irqsave(&sport->port.lock, flags);
/* first save CR2 and then disable interrupts */
cr2 = old_cr2 = readb(sport->port.membase + UARTCR2);
@@ -1723,6 +1730,9 @@ lpuart_console_write(struct console *co, const char *s, unsigned int count)
barrier();
writeb(old_cr2, sport->port.membase + UARTCR2);
+
+ if (locked)
+ spin_unlock_irqrestore(&sport->port.lock, flags);
}
static void
@@ -1730,6 +1740,13 @@ lpuart32_console_write(struct console *co, const char *s, unsigned int count)
{
struct lpuart_port *sport = lpuart_ports[co->index];
unsigned long old_cr, cr;
+ unsigned long flags;
+ int locked = 1;
+
+ if (sport->port.sysrq || oops_in_progress)
+ locked = spin_trylock_irqsave(&sport->port.lock, flags);
+ else
+ spin_lock_irqsave(&sport->port.lock, flags);
/* first save CR2 and then disable interrupts */
cr = old_cr = lpuart32_read(sport->port.membase + UARTCTRL);
@@ -1744,6 +1761,9 @@ lpuart32_console_write(struct console *co, const char *s, unsigned int count)
barrier();
lpuart32_write(old_cr, sport->port.membase + UARTCTRL);
+
+ if (locked)
+ spin_unlock_irqrestore(&sport->port.lock, flags);
}
/*