acpi_memhotplug.c: auto bind the memory device which is hotplugged before the driver is loaded

If the memory device is hotplugged before the driver is loaded, the user
cannot see this device under the directory /sys/bus/acpi/devices/, and the
user cannot bind it by hand after the driver is loaded.  This patch
introduces a new feature to bind such device when the driver is being
loaded.

Signed-off-by: Wen Congyang <wency@cn.fujitsu.com>
Cc: Len Brown <lenb@kernel.org>
Cc: "Brown, Len" <len.brown@intel.com>
Cc: Yasuaki ISIMATU <isimatu.yasuaki@jp.fujitsu.com>
Cc: David Rientjes <rientjes@google.com>
Cc: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>

acpi_memhotplug.c: bind the memory device when the driver is being loaded

We had introduced acpi_hotmem_initialized to avoid strange add_memory fail
message.  But the memory device may not be used by the kernel, and the
device should be bound when the driver is being loaded.  Remove
acpi_hotmem_initialized to allow that the device can be bound when the
driver is being loaded.

Signed-off-by: Wen Congyang <wency@cn.fujitsu.com>
Cc: Len Brown <lenb@kernel.org>
Cc: "Brown, Len" <len.brown@intel.com>
Cc: Yasuaki ISIMATU <isimatu.yasuaki@jp.fujitsu.com>
Cc: David Rientjes <rientjes@google.com>
Cc: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>

acpi_memhotplug.c: don't allow to eject the memory device if it is being used

We eject the memory device even if it is in use.  It is very dangerous,
and it will cause the kernel to panic.

Signed-off-by: Wen Congyang <wency@cn.fujitsu.com>
Cc: Len Brown <lenb@kernel.org>
Cc: "Brown, Len" <len.brown@intel.com>
Cc: Yasuaki ISIMATU <isimatu.yasuaki@jp.fujitsu.com>
Cc: David Rientjes <rientjes@google.com>
Cc: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>

acpi_memhotplug.c: remove memory info from list before freeing it

We free info, but we forget to remove it from the list.  It will cause
unexpected problems when we access the list next time.

Signed-off-by: Wen Congyang <wency@cn.fujitsu.com>
Cc: Len Brown <lenb@kernel.org>
Cc: "Brown, Len" <len.brown@intel.com>
Cc: Yasuaki ISIMATU <isimatu.yasuaki@jp.fujitsu.com>
Cc: David Rientjes <rientjes@google.com>
Cc: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>

acpi_memhotplug.c: free memory device if acpi_memory_enable_device() failed

If acpi_memory_enable_device() fails, acpi_memory_enable_device() will
return a non-zero value, which means we fail to bind the memory device to
this driver.  So we should free memory device before
acpi_memory_device_add() returns.

Signed-off-by: Wen Congyang <wency@cn.fujitsu.com>
Cc: Len Brown <lenb@kernel.org>
Cc: "Brown, Len" <len.brown@intel.com>
Cc: Yasuaki ISIMATU <isimatu.yasuaki@jp.fujitsu.com>
Cc: David Rientjes <rientjes@google.com>
Cc: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>

acpi_memhotplug.c: fix memory leak when memory device is unbound from the module acpi_memhotplug

We allocate memory to store acpi_memory_info, so we should free it before
freeing mem_device.

Signed-off-by: Wen Congyang <wency@cn.fujitsu.com>
Cc: Len Brown <lenb@kernel.org>
Cc: "Brown, Len" <len.brown@intel.com>
Cc: Yasuaki ISIMATU <isimatu.yasuaki@jp.fujitsu.com>
Cc: David Rientjes <rientjes@google.com>
Cc: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>

Merge branch 'signal/from-sfr'

Conflicts:
arch/alpha/kernel/process.c
arch/arm/include/asm/thread_info.h
arch/powerpc/kernel/entry_64.S
arch/x86/kernel/signal.c

Merge remote-tracking branch 'userns/for-next'

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Merge remote-tracking branch 'dma-mapping/dma-mapping-next'

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Merge remote-tracking branch 'samsung/for-next'

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Merge remote-tracking branch 'ep93xx/ep93xx-for-next'

Merge remote-tracking branch 'arm-soc/for-next'

Conflicts:
drivers/mtd/nand/Kconfig

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Merge remote-tracking branch 'vhost/linux-next'

Conflicts:
drivers/net/tun.c

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drivers/misc/mei/interrupt.c

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drivers/hid/hid-picolcd.c

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Merge commit 'refs/next/20120822/kvm'

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arch/s390/include/asm/processor.h

Merge remote-tracking branch 'kmemleak/kmemleak'

Merge remote-tracking branch 'rcu/rcu/next'

Conflicts:
arch/Kconfig
arch/x86/Kconfig
include/linux/sched.h
kernel/rcutree.h
kernel/rcutree_plugin.h

Merge remote-tracking branch 'tip/auto-latest'

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arch/Kconfig

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Documentation/edac.txt
drivers/edac/amd64_edac.c

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kernel/audit_tree.c

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Merge remote-tracking branch 'input/next'

Merge branch 'quilt/rr'

Conflicts:
arch/alpha/Kconfig
arch/mips/kernel/module.c
arch/s390/Kconfig
arch/xtensa/Kconfig

Merge remote-tracking branch 'sound-asoc/for-next'

Merge remote-tracking branch 'sound/for-next'

Merge commit 'refs/next/20120823/drm'

Merge remote-tracking branch 'crypto/master'

Merge remote-tracking branch 'l2-mtd/master'

Merge remote-tracking branch 'mtd/master'

Merge remote-tracking branch 'bluetooth/master'

Merge remote-tracking branch 'wireless-next/master'

Merge remote-tracking branch 'net-next/master'

Merge remote-tracking branch 'slave-dma/next'

Merge remote-tracking branch 'target-updates/for-next'

Merge remote-tracking branch 'scsi/for-next'

Conflicts:
drivers/ata/libata-core.c

Merge remote-tracking branch 'dlm/next'

Merge commit 'refs/next/20120823/ubi'

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Merge remote-tracking branch 'sh/sh-latest'