msm_geni_serial: Make IRQ handler explicitly threaded

The uart_port lock is a sleepable spin lock which would require many
invasive changes to convert it to a raw spin lock so that it'd be safe to
use from hard IRQ context on RT. Instead of doing that, just make the GENI
UART IRQ handler explicitly threaded to fix the issue.

Signed-off-by: Sultan Alsawaf <sultan@kerneltoast.com>
Signed-off-by: Pranav Vashi <neobuddy89@gmail.com>

Author: kerneltoast

drivers/tty/serial/msm_geni_serial.c

@@ -2385,7 +2385,8 @@ static int msm_geni_serial_startup(struct uart_port *uport)
 		enable_irq(uport->irq);
 
 	if (msm_port->wakeup_irq > 0) {
-		ret = request_irq(msm_port->wakeup_irq, msm_geni_wakeup_isr,
+		ret = request_threaded_irq(msm_port->wakeup_irq, NULL,
+				msm_geni_wakeup_isr,
 				IRQF_TRIGGER_FALLING | IRQF_ONESHOT,
 				"hs_uart_wakeup", uport);
 		if (unlikely(ret)) {