diff options
| -rw-r--r-- | drivers/tty/serial/fsl_lpuart.c | 20 |
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); } /* |