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drivers: base: use standard device online/offline for state change

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There are two ways to set the online/offline state for a memory block:
echo 0|1 > online and echo online|online_kernel|online_movable|offline >
state.

The state attribute can online a memory block with extra data, the
"online type", where the online attribute uses a default online type of
ONLINE_KEEP, same as echo online > state.

Currently there is a state_mutex that provides consistency between the
memory block state and the underlying memory.

The problem is that this code does a lot of things that the common
device layer can do for us, such as the serialization of the
online/offline handlers using the device lock, setting the dev->offline
field, and calling kobject_uevent().

This patch refactors the online/offline code to allow the common
device_[online|offline] functions to be used.  The result is a simpler
and more common code path for the two state setting mechanisms.  It also
removes the state_mutex from the struct memory_block as the memory block
device lock provides the state consistency.

No functional change is intended by this patch.

Signed-off-by: Seth Jennings <sjenning@linux.vnet.ibm.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Seth Jennings 2013-08-20 16:05:05 -05:00 • committed by Greg Kroah-Hartman
parent cb5e39b803
commit fa2be40fe7
2 changed files with 58 additions and 82 deletions
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13
include/linux/memory.h
View file

@ -25,16 +25,9 @@
struct memory_block {
unsigned long start_section_nr;
unsigned long end_section_nr;
unsigned long state;
int section_count;
/*
* This serializes all state change requests. It isn't
* held during creation because the control files are
* created long after the critical areas during
* initialization.
*/
struct mutex state_mutex;
unsigned long state; /* serialized by the dev->lock */
int section_count; /* serialized by mem_sysfs_mutex */
int online_type; /* for passing data to online routine */
int phys_device; /* to which fru does this belong? */
void *hw; /* optional pointer to fw/hw data */
int (*phys_callback)(struct memory_block *);