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authorRussell King <rmk@dyn-67.arm.linux.org.uk>2005-11-05 21:20:47 +0000
committerRussell King <rmk+kernel@arm.linux.org.uk>2005-11-05 21:20:47 +0000
commit95cb5d954ee656a0b048ea2298188569e0759336 (patch)
tree3283cd23477bad8d3a418e6f501b39145bfd54b8
parent5d994b7f5d1c77acaa0b9b4c1b9f0f278605c309 (diff)
[DRIVER MODEL] Fix jazzsonic
Release code in driver modules is a potential cause of oopsen. The device may be in use by a userspace process, which will keep a reference to the device. If the module is unloaded, the module text will be freed. Subsequently, when the last reference is dropped, the release code will be called, which no longer exists. Use generic platform device allocation/release code in modules. Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk> Acked-by: Greg Kroah-Hartman <gregkh@suse.de>
-rw-r--r--drivers/net/jazzsonic.c28
1 files changed, 5 insertions, 23 deletions
diff --git a/drivers/net/jazzsonic.c b/drivers/net/jazzsonic.c
index a74a5cfaf5b..2fb3101cb33 100644
--- a/drivers/net/jazzsonic.c
+++ b/drivers/net/jazzsonic.c
@@ -285,18 +285,8 @@ static struct device_driver jazz_sonic_driver = {
.remove = __devexit_p(jazz_sonic_device_remove),
};
-static void jazz_sonic_platform_release (struct device *device)
-{
- struct platform_device *pldev;
-
- /* free device */
- pldev = to_platform_device (device);
- kfree (pldev);
-}
-
static int __init jazz_sonic_init_module(void)
{
- struct platform_device *pldev;
int err;
if ((err = driver_register(&jazz_sonic_driver))) {
@@ -304,27 +294,19 @@ static int __init jazz_sonic_init_module(void)
return err;
}
- jazz_sonic_device = NULL;
-
- if (!(pldev = kmalloc (sizeof (*pldev), GFP_KERNEL))) {
+ jazz_sonic_device = platform_device_alloc(jazz_sonic_string, 0);
+ if (!jazz_sonnic_device)
goto out_unregister;
- }
- memset(pldev, 0, sizeof (*pldev));
- pldev->name = jazz_sonic_string;
- pldev->id = 0;
- pldev->dev.release = jazz_sonic_platform_release;
- jazz_sonic_device = pldev;
-
- if (platform_device_register (pldev)) {
- kfree(pldev);
+ if (platform_device_add(jazz_sonic_device)) {
+ platform_device_put(jazz_sonic_device);
jazz_sonic_device = NULL;
}
return 0;
out_unregister:
- platform_device_unregister(pldev);
+ driver_unregister(&jazz_sonic_driver);
return -ENOMEM;
}