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Commit 68357c7d authored by Chen, Jie's avatar Chen, Jie Committed by Greg Kroah-Hartman
Browse files

mrst_max3110: fix unbalanced IRQ issue during resume 



During resume, a startup will request_irq again, meantime resume function's
enable_irq will cause unbalanced IRQ issue.
Fix this issue by moving request_irq to probe function.

Signed-off-by: default avatarDavid Cohen <david.a.cohen@linux.intel.com>
Signed-off-by: default avatarChen, Jie <jie.d.chen@intel.com>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent 2a0b965c

drivers/tty/serial/mrst_max3110.c

+17 −18
Original line number Diff line number Diff line
@@ -43,6 +43,7 @@ 


#include <linux/kthread.h>

#include <linux/spi/spi.h>

#include <linux/pm.h>



#include "mrst_max3110.h"
@@ -494,19 +495,9 @@ static int serial_m3110_startup(struct uart_port *port) 
	port->state->port.low_latency = 1;



	if (max->irq) {

		max->read_thread = NULL;

		ret = request_irq(max->irq, serial_m3110_irq,

				IRQ_TYPE_EDGE_FALLING, "max3110", max);

		if (ret) {

			max->irq = 0;

			pr_err(PR_FMT "unable to allocate IRQ, polling\n");

		}  else {

		/* Enable RX IRQ only */

		config |= WC_RXA_IRQ_ENABLE;

		}

	}



	if (max->irq == 0) {

	} else {

		/* If IRQ is disabled, start a read thread for input data */

		max->read_thread =

			kthread_run(max3110_read_thread, max, "max3110_read");
@@ -520,8 +511,6 @@ static int serial_m3110_startup(struct uart_port *port) 


	ret = max3110_out(max, config);

	if (ret) {

		if (max->irq)

			free_irq(max->irq, max);

		if (max->read_thread)

			kthread_stop(max->read_thread);

		max->read_thread = NULL;
@@ -543,9 +532,6 @@ static void serial_m3110_shutdown(struct uart_port *port) 
		max->read_thread = NULL;

	}



	if (max->irq)

		free_irq(max->irq, max);



	/* Disable interrupts from this port */

	config = WC_TAG | WC_SW_SHDI;

	max3110_out(max, config);
@@ -846,6 +832,16 @@ static int serial_m3110_probe(struct spi_device *spi) 
		goto err_kthread;

	}



	if (max->irq) {

		ret = request_irq(max->irq, serial_m3110_irq,

				IRQ_TYPE_EDGE_FALLING, "max3110", max);

		if (ret) {

			max->irq = 0;

			dev_warn(&spi->dev,

			"unable to allocate IRQ, will use polling method\n");

		}

	}



	spi_set_drvdata(spi, max);

	pmax = max;
@@ -873,6 +869,9 @@ static int serial_m3110_remove(struct spi_device *dev) 


	free_page((unsigned long)max->con_xmit.buf);



	if (max->irq)

		free_irq(max->irq, max);



	if (max->main_thread)

		kthread_stop(max->main_thread);