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| author | Dmitriy Vyukov <dvyukov@google.com> | 2015-09-22 10:51:52 +0200 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2015-09-23 02:36:07 +0200 |
| commit | 7def0f952eccdd0edb3c504f4dab35ee0d3aba1f (patch) | |
| tree | b07b5d821064709d15bf725818ab3e3a751daafe /lib/iomap_copy.c | |
| parent | ch9200: Convert to use module_usb_driver (diff) | |
| download | linux-7def0f952eccdd0edb3c504f4dab35ee0d3aba1f.tar.xz linux-7def0f952eccdd0edb3c504f4dab35ee0d3aba1f.zip | |
lib: fix data race in rhashtable_rehash_one
rhashtable_rehash_one() uses complex logic to update entry->next field,
after INIT_RHT_NULLS_HEAD and NULLS_MARKER expansion:
entry->next = 1 | ((base + off) << 1)
This can be compiled along the lines of:
entry->next = base + off
entry->next <<= 1
entry->next |= 1
Which will break concurrent readers.
NULLS value recomputation is not needed here, so just remove
the complex logic.
The data race was found with KernelThreadSanitizer (KTSAN).
Signed-off-by: Dmitry Vyukov <dvyukov@google.com>
Acked-by: Eric Dumazet <edumazet@google.com>
Acked-by: Thomas Graf <tgraf@suug.ch>
Acked-by: Herbert Xu <herbert@gondor.apana.org.au>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'lib/iomap_copy.c')
0 files changed, 0 insertions, 0 deletions