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drivers: base: remove improper get/put in add_memory_section() 

The path through add_memory_section() when the memory block already
exists uses flawed refcounting logic.  A get_device() is done on a
memory block using a pointer that might not be valid as we dropped
our previous reference and didn't obtain a new reference in the
proper way.

Lets stop pretending and just remove the get/put.  The
mem_sysfs_mutex, which we hold over the entire init loop now, will
prevent the memory blocks from disappearing from under us.

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 12:13:02 -05:00 committed by Greg Kroah-Hartman
parent 37a7bd6255
commit 37171e3cb7
1 changed files with 2 additions and 4 deletions
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6
drivers/base/memory.c
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@ -613,14 +613,12 @@ static int add_memory_section(struct mem_section *section,
if (scn_nr >= (*mem_p)->start_section_nr &&
scn_nr <= (*mem_p)->end_section_nr) {
mem = *mem_p;
get_device(&mem->dev);
}
}
if (mem) {
if (mem)
mem->section_count++;
put_device(&mem->dev);
} else {
else {
ret = init_memory_block(&mem, section, MEM_ONLINE);
/* store memory_block pointer for next loop */
if (!ret && mem_p)