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drivers/base/memory: add memory block to memory group after registration succeeded

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[ Upstream commit 7ea0d2d79d ]

If register_memory() fails, we freed the memory block but already added
the memory block to the group list, not good.  Let's defer adding the
block to the memory group to after registering the memory block device.

We do handle it properly during unregister_memory(), but that's not
called when the registration fails.

Link: https://lkml.kernel.org/r/20220128144540.153902-1-david@redhat.com
Fixes: 028fc57a1c ("drivers/base/memory: introduce "memory groups" to logically group memory blocks")
Signed-off-by: David Hildenbrand <david@redhat.com>
Reviewed-by: Oscar Salvador <osalvador@suse.de>
Acked-by: Michal Hocko <mhocko@suse.com>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: "Rafael J. Wysocki" <rafael@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
David Hildenbrand 2022-03-22 14:47:09 -07:00 • committed by Justin Hammond
parent 2eb2809579
commit d68f2d8941
1 changed files with 5 additions and 3 deletions
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8
drivers/base/memory.c
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@ -663,14 +663,16 @@ static int init_memory_block(unsigned long block_id, unsigned long state,
mem->nr_vmemmap_pages = nr_vmemmap_pages;
INIT_LIST_HEAD(&mem->group_next);
ret = register_memory(mem);
if (ret)
return ret;
if (group) {
mem->group = group;
list_add(&mem->group_next, &group->memory_blocks);
}
ret = register_memory(mem);
return ret;
return 0;
}
static int add_memory_block(unsigned long base_section_nr)