linux-kernel - [ 54/68] media: staging: lirc

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Date:	Fri, 09 Mar 2012 11:03:08 -0800
From:	Greg KH <gregkh@...uxfoundation.org>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:	torvalds@...ux-foundation.org, akpm@...ux-foundation.org,
	alan@...rguk.ukuu.org.uk, Ben Hutchings <ben@...adent.org.uk>,
	Mauro Carvalho Chehab <mchehab@...hat.com>,
	Jonathan Nieder <jrnieder@...il.com>
Subject: [ 54/68] media: staging: lirc_serial: Fix init/exit order

3.0-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Ben Hutchings <ben@...adent.org.uk>

commit 9105b8b200410383d0854bbe237ee385d7d33ba6 upstream.

Currently the module init function registers a platform_device and
only then allocates its IRQ and I/O region.  This allows allocation to
race with the device's suspend() function.  Instead, allocate
resources in the platform driver's probe() function and free them in
the remove() function.

The module exit function removes the platform device before the
character device that provides access to it.  Change it to reverse the
order of initialisation.

Signed-off-by: Ben Hutchings <ben@...adent.org.uk>
Signed-off-by: Mauro Carvalho Chehab <mchehab@...hat.com>
Signed-off-by: Jonathan Nieder <jrnieder@...il.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 drivers/staging/lirc/lirc_serial.c |   56 +++++++++++++------------------------
 1 file changed, 21 insertions(+), 35 deletions(-)

--- a/drivers/staging/lirc/lirc_serial.c
+++ b/drivers/staging/lirc/lirc_serial.c
@@ -836,7 +836,7 @@ static int hardware_init_port(void)
 	return 0;
 }
 
-static int init_port(void)
+static int __devinit lirc_serial_probe(struct platform_device *dev)
 {
 	int i, nlow, nhigh, result;
 
@@ -913,6 +913,18 @@ static int init_port(void)
 	return 0;
 }
 
+static int __devexit lirc_serial_remove(struct platform_device *dev)
+{
+	free_irq(irq, (void *)&hardware);
+
+	if (iommap != 0)
+		release_mem_region(iommap, 8 << ioshift);
+	else
+		release_region(io, 8);
+
+	return 0;
+}
+
 static int set_use_inc(void *data)
 {
 	unsigned long flags;
@@ -1076,16 +1088,6 @@ static struct lirc_driver driver = {
 
 static struct platform_device *lirc_serial_dev;
 
-static int __devinit lirc_serial_probe(struct platform_device *dev)
-{
-	return 0;
-}
-
-static int __devexit lirc_serial_remove(struct platform_device *dev)
-{
-	return 0;
-}
-
 static int lirc_serial_suspend(struct platform_device *dev,
 			       pm_message_t state)
 {
@@ -1188,10 +1190,6 @@ static int __init lirc_serial_init_modul
 {
 	int result;
 
-	result = lirc_serial_init();
-	if (result)
-		return result;
-
 	switch (type) {
 	case LIRC_HOMEBREW:
 	case LIRC_IRDEO:
@@ -1211,8 +1209,7 @@ static int __init lirc_serial_init_modul
 		break;
 #endif
 	default:
-		result = -EINVAL;
-		goto exit_serial_exit;
+		return -EINVAL;
 	}
 	if (!softcarrier) {
 		switch (type) {
@@ -1228,37 +1225,26 @@ static int __init lirc_serial_init_modul
 		}
 	}
 
-	result = init_port();
-	if (result < 0)
-		goto exit_serial_exit;
+	result = lirc_serial_init();
+	if (result)
+		return result;
+
 	driver.features = hardware[type].features;
 	driver.dev = &lirc_serial_dev->dev;
 	driver.minor = lirc_register_driver(&driver);
 	if (driver.minor < 0) {
 		printk(KERN_ERR  LIRC_DRIVER_NAME
 		       ": register_chrdev failed!\n");
-		result = -EIO;
-		goto exit_release;
+		lirc_serial_exit();
+		return -EIO;
 	}
 	return 0;
-exit_release:
-	release_region(io, 8);
-exit_serial_exit:
-	lirc_serial_exit();
-	return result;
 }
 
 static void __exit lirc_serial_exit_module(void)
 {
-	lirc_serial_exit();
-
-	free_irq(irq, (void *)&hardware);
-
-	if (iommap != 0)
-		release_mem_region(iommap, 8 << ioshift);
-	else
-		release_region(io, 8);
 	lirc_unregister_driver(driver.minor);
+	lirc_serial_exit();
 	dprintk("cleaned up module\n");
 }
 


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