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authorRussell King <rmk@dyn-67.arm.linux.org.uk>2005-11-06 00:20:47 +0300
committerRussell King <rmk+kernel@arm.linux.org.uk>2005-11-06 00:20:47 +0300
commit95cb5d954ee656a0b048ea2298188569e0759336 (patch)
tree3283cd23477bad8d3a418e6f501b39145bfd54b8 /drivers/net/jazzsonic.c
parent5d994b7f5d1c77acaa0b9b4c1b9f0f278605c309 (diff)
downloadlinux-95cb5d954ee656a0b048ea2298188569e0759336.tar.xz
[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>
Diffstat (limited to 'drivers/net/jazzsonic.c')
-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 a74a5cfaf5bc..2fb3101cb33e 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;
}