[PATCH] Driver Core: remove driver model detach_state

The driver model has a "detach_state" mechanism that:

 - Has never been used by any in-kernel drive;
 - Is superfluous, since driver remove() methods can do the same thing;
 - Became buggy when the suspend() parameter changed semantics and type;
 - Could self-deadlock when called from certain suspend contexts;
 - Is effectively wasted documentation, object code, and headspace.

This removes that "detach_state" mechanism; net code shrink, as well
as a per-device saving in the driver model and sysfs.

Signed-off-by: David Brownell <dbrownell@users.sourceforge.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

1 files changed, 0 insertions, 3 deletions

diff --git a/include/linux/device.h b/include/linux/device.h
index cf470459fa69..df94c0de53f2 100644
--- a/include/linux/device.h
+++ b/include/linux/device.h
@@ -273,9 +273,6 @@ struct device {
                                            BIOS data relevant to device) */
         struct dev_pm_info      power;
 
-        u32             detach_state;   /* State to enter when device is
-                                           detached from its driver. */
-
         u64             *dma_mask;      /* dma mask (if dma'able device) */
         u64             coherent_dma_mask;/* Like dma_mask, but for
                                              alloc_coherent mappings as