diff options
| author | Frank Rowand <frank.rowand@sony.com> | 2018-12-18 22:40:03 +0300 |
|---|---|---|
| committer | Rob Herring <robh@kernel.org> | 2018-12-21 21:42:36 +0300 |
| commit | 5801169a2ed20003f771acecf3ac00574cf10a38 (patch) | |
| tree | 56bcdc99f2d669033eea3c4308e52419a44ddc7e /drivers/of/dynamic.c | |
| parent | b8a9ac1a5b99a2fcbed19fd29d2d59270c281a31 (diff) | |
| download | linux-5801169a2ed20003f771acecf3ac00574cf10a38.tar.xz | |
of: __of_detach_node() - remove node from phandle cache
Non-overlay dynamic devicetree node removal may leave the node in
the phandle cache. Subsequent calls to of_find_node_by_phandle()
will incorrectly find the stale entry. Remove the node from the
cache.
Add paranoia checks in of_find_node_by_phandle() as a second level
of defense (do not return cached node if detached, do not add node
to cache if detached).
Fixes: 0b3ce78e90fc ("of: cache phandle nodes to reduce cost of of_find_node_by_phandle()")
Reported-by: Michael Bringmann <mwb@linux.vnet.ibm.com>
Cc: stable@vger.kernel.org # v4.17+
Signed-off-by: Frank Rowand <frank.rowand@sony.com>
Signed-off-by: Rob Herring <robh@kernel.org>
Diffstat (limited to 'drivers/of/dynamic.c')
| -rw-r--r-- | drivers/of/dynamic.c | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/drivers/of/dynamic.c b/drivers/of/dynamic.c index b4e5b90cb314..a09c1c3cf831 100644 --- a/drivers/of/dynamic.c +++ b/drivers/of/dynamic.c @@ -277,6 +277,9 @@ void __of_detach_node(struct device_node *np) } of_node_set_flag(np, OF_DETACHED); + + /* race with of_find_node_by_phandle() prevented by devtree_lock */ + __of_free_phandle_cache_entry(np->phandle); } /** |