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| author | Seth Jennings <sjenning@linux.vnet.ibm.com> | 2013-08-20 19:13:02 +0200 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2013-08-21 20:49:47 +0200 |
| commit | 37171e3cb7a2f6fc594b524c940beb1ce85cc935 (patch) | |
| tree | 16fe5b67c4ef5e25bce7ebbf1fee2f173311a3f4 /drivers/base | |
| parent | drivers: base: reduce add_memory_section() for boot-time only (diff) | |
| download | linux-37171e3cb7a2f6fc594b524c940beb1ce85cc935.tar.xz linux-37171e3cb7a2f6fc594b524c940beb1ce85cc935.zip | |
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>
Diffstat (limited to 'drivers/base')
| -rw-r--r-- | drivers/base/memory.c | 6 |
1 files changed, 2 insertions, 4 deletions
diff --git a/drivers/base/memory.c b/drivers/base/memory.c index a9e9c0902cce..9438d541b5c3 100644 --- a/drivers/base/memory.c +++ b/drivers/base/memory.c @@ -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) |