1 files changed, 28 insertions, 27 deletions

diff --git a/drivers/serial/mrst_max3110.c b/drivers/serial/mrst_max3110.c
index af8db27f9e87..b62857bf2fdb 100644
--- a/drivers/serial/mrst_max3110.c
+++ b/drivers/serial/mrst_max3110.c
@@ -447,7 +447,6 @@ static int max3110_main_thread(void *_max)
         return ret;
 }
 
-#ifdef CONFIG_MRST_MAX3110_IRQ
 static irqreturn_t serial_m3110_irq(int irq, void *dev_id)
 {
         struct uart_max3110 *max = dev_id;
@@ -459,7 +458,7 @@ static irqreturn_t serial_m3110_irq(int irq, void *dev_id)
 
         return IRQ_HANDLED;
 }
-#else
+
 /* if don't use RX IRQ, then need a thread to polling read */
 static int max3110_read_thread(void *_max)
 {
@@ -482,7 +481,6 @@ static int max3110_read_thread(void *_max)
 
         return 0;
 }
-#endif
 
 static int serial_m3110_startup(struct uart_port *port)
 {
@@ -505,34 +503,38 @@ static int serial_m3110_startup(struct uart_port *port)
         /* as we use thread to handle tx/rx, need set low latency */
         port->state->port.tty->low_latency = 1;
 
-#ifdef CONFIG_MRST_MAX3110_IRQ
-        ret = request_irq(max->irq, serial_m3110_irq,
+        if (max->irq) {
+                max->read_thread = NULL;
+                ret = request_irq(max->irq, serial_m3110_irq,
                                 IRQ_TYPE_EDGE_FALLING, "max3110", max);
-        if (ret)
-                return ret;
+                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;
+                }
+        }
 
-        /* Enable RX IRQ only */
-        config |= WC_RXA_IRQ_ENABLE;
-#else
-        /* If IRQ is disabled, start a read thread for input data */
-        max->read_thread =
-                kthread_run(max3110_read_thread, max, "max3110_read");
-        if (IS_ERR(max->read_thread)) {
-                ret = PTR_ERR(max->read_thread);
-                max->read_thread = NULL;
-                pr_err(PR_FMT "Can't create read thread!");
-                return ret;
+        if (max->irq == 0) {
+                /* If IRQ is disabled, start a read thread for input data */
+                max->read_thread =
+                        kthread_run(max3110_read_thread, max, "max3110_read");
+                if (IS_ERR(max->read_thread)) {
+                        ret = PTR_ERR(max->read_thread);
+                        max->read_thread = NULL;
+                        pr_err(PR_FMT "Can't create read thread!\n");
+                        return ret;
+                }
         }
-#endif
 
         ret = max3110_out(max, config);
         if (ret) {
-#ifdef CONFIG_MRST_MAX3110_IRQ
-                free_irq(max->irq, max);
-#else
-                kthread_stop(max->read_thread);
+                if (max->irq)
+                        free_irq(max->irq, max);
+                if (max->read_thread)
+                        kthread_stop(max->read_thread);
                 max->read_thread = NULL;
-#endif
                 return ret;
         }
 
@@ -551,9 +553,8 @@ static void serial_m3110_shutdown(struct uart_port *port)
                 max->read_thread = NULL;
         }
 
-#ifdef CONFIG_MRST_MAX3110_IRQ
-        free_irq(max->irq, max);
-#endif
+        if (max->irq)
+                free_irq(max->irq, max);
 
         /* Disable interrupts from this port */
         config = WC_TAG | WC_SW_SHDI;