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ACPI: dock: fix opps after dock driver fails to initialize 

The driver tests the dock_station pointer for nonnull
to check whether it has initialized properly. But in
some cases dock_station will be non-null after being
freed when driver init fails. Fix by zeroing the
pointer after freeing.

Signed-off-by: Chuck Ebbert <cebbert@redhat.com>
Signed-off-by: Kristen Carlson Accardi <kristen.c.accardi@intel.com>
Signed-off-by: Len Brown <len.brown@intel.com>
This commit is contained in:
Chuck Ebbert 2007-05-09 15:05:48 -07:00 committed by Len Brown
parent 38ff4ffc03
commit 22fe4c2114
1 changed files with 7 additions and 0 deletions
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7
drivers/acpi/dock.c
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@ -715,6 +715,7 @@ static int dock_add(acpi_handle handle)
if (ret) {
printk(KERN_ERR PREFIX "Error %d registering dock device\n", ret);
kfree(dock_station);
dock_station = NULL;
return ret;
}
ret = device_create_file(&dock_device.dev, &dev_attr_docked);
@ -722,6 +723,7 @@ static int dock_add(acpi_handle handle)
printk("Error %d adding sysfs file\n", ret);
platform_device_unregister(&dock_device);
kfree(dock_station);
dock_station = NULL;
return ret;
}
ret = device_create_file(&dock_device.dev, &dev_attr_undock);
@ -730,6 +732,7 @@ static int dock_add(acpi_handle handle)
device_remove_file(&dock_device.dev, &dev_attr_docked);
platform_device_unregister(&dock_device);
kfree(dock_station);
dock_station = NULL;
return ret;
}
ret = device_create_file(&dock_device.dev, &dev_attr_uid);
@ -739,6 +742,7 @@ static int dock_add(acpi_handle handle)
device_remove_file(&dock_device.dev, &dev_attr_undock);
platform_device_unregister(&dock_device);
kfree(dock_station);
dock_station = NULL;
return ret;
}
@ -751,6 +755,7 @@ static int dock_add(acpi_handle handle)
dd = alloc_dock_dependent_device(handle);
if (!dd) {
kfree(dock_station);
dock_station = NULL;
ret = -ENOMEM;
goto dock_add_err_unregister;
}
@ -779,6 +784,7 @@ static int dock_add(acpi_handle handle)
device_remove_file(&dock_device.dev, &dev_attr_uid);
platform_device_unregister(&dock_device);
kfree(dock_station);
dock_station = NULL;
return ret;
}
@ -813,6 +819,7 @@ static int dock_remove(void)
/* free dock station memory */
kfree(dock_station);
dock_station = NULL;
return 0;
}