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memory-hotplug: use dev_online for memhp_auto_online

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Commit 31bc3858ea ("add automatic onlining policy for the newly added
memory") provides the capability to have added memory automatically
onlined during add, but this appears to be slightly broken.

The current implementation uses walk_memory_range() to call
online_memory_block, which uses memory_block_change_state() to online
the memory.  Instead, we should be calling device_online() for the
memory block in online_memory_block().  This would online the memory
(the memory bus online routine memory_subsys_online() called from
device_online calls memory_block_change_state()) and properly update the
device struct offline flag.

As a result of the current implementation, attempting to remove a memory
block after adding it using auto online fails.  This is because doing a
remove, for instance

  echo offline > /sys/devices/system/memory/memoryXXX/state

uses device_offline() which checks the dev->offline flag.

Link: http://lkml.kernel.org/r/20170222220744.8119.19687.stgit@ltcalpine2-lp14.aus.stglabs.ibm.com
Signed-off-by: Nathan Fontenot <[email protected]>
Cc: Michael Ellerman <[email protected]>
Cc: Michael Roth <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
This commit is contained in:
Nathan Fontenot 2017-02-24 15:00:02 -08:00 • committed by Linus Torvalds
commit dc18d706a4
3 changed files with 2 additions and 5 deletions
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2
drivers/base/memory.c
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@ -249,7 +249,7 @@ memory_block_action(unsigned long phys_index, unsigned long action, int online_t
return ret;
}
int memory_block_change_state(struct memory_block *mem,
static int memory_block_change_state(struct memory_block *mem,
unsigned long to_state, unsigned long from_state_req)
{
int ret = 0;