[SERIAL] sunzilog: Fix bugs in device deregristration.

1) Need to unregister 2 ports per of_device.
2) Need to of_iounmap() 1 mapping per of_device.
3) Need to free up the IRQ only after all devices
   have been unregistered.

Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 22 insertions, 7 deletions

diff --git a/drivers/serial/sunzilog.c b/drivers/serial/sunzilog.c
index cbdf9d605b3f..98342eeba734 100644
--- a/drivers/serial/sunzilog.c
+++ b/drivers/serial/sunzilog.c
@@ -1335,9 +1335,10 @@ static int __devinit zs_get_instance(struct device_node *dp)
         return ret;
 }
 
+static int zilog_irq = -1;
+
 static int __devinit zs_probe(struct of_device *dev, const struct of_device_id *match)
 {
-        static int zilog_irq = -1;
         struct of_device *op = to_of_device(&dev->dev);
         struct uart_sunzilog_port *up;
         struct zilog_layout __iomem *rp;
@@ -1413,24 +1414,33 @@ static int __devinit zs_probe(struct of_device *dev, const struct of_device_id *
                 }
         }
 
+        dev_set_drvdata(&dev->dev, &up[0]);
+
         return 0;
 }
 
-static int __devexit zs_remove(struct of_device *dev)
+static void __devexit zs_remove_one(struct uart_sunzilog_port *up)
 {
-        struct uart_sunzilog_port *up = dev_get_drvdata(&dev->dev);
-        struct zilog_channel __iomem *channel;
-
         if (ZS_IS_KEYB(up) || ZS_IS_MOUSE(up)) {
 #ifdef CONFIG_SERIO
                 serio_unregister_port(&up->serio);
 #endif
         } else
                 uart_remove_one_port(&sunzilog_reg, &up->port);
+}
 
-        channel = ZILOG_CHANNEL_FROM_PORT(&up->port);
+static int __devexit zs_remove(struct of_device *dev)
+{
+        struct uart_sunzilog_port *up = dev_get_drvdata(&dev->dev);
+        struct zilog_layout __iomem *regs;
+
+        zs_remove_one(&up[0]);
+        zs_remove_one(&up[1]);
 
-        of_iounmap(channel, sizeof(struct zilog_channel));
+        regs = sunzilog_chip_regs[up[0].port.line / 2];
+        of_iounmap(regs, sizeof(struct zilog_layout));
+
+        dev_set_drvdata(&dev->dev, NULL);
 
         return 0;
 }
@@ -1489,6 +1499,11 @@ static void __exit sunzilog_exit(void)
 {
         of_unregister_driver(&zs_driver);
 
+        if (zilog_irq != -1) {
+                free_irq(zilog_irq, sunzilog_irq_chain);
+                zilog_irq = -1;
+        }
+
         if (NUM_SUNZILOG) {
                 uart_unregister_driver(&sunzilog_reg);
                 sunzilog_free_tables();