maple_tree: add smp_rmb() to dead node detection
commit 0a2b18d948838e16912b3b627b504ab062b7d02a upstream.
Add an smp_rmb() before reading the parent pointer to ensure that anything
read from the node prior to the parent pointer hasn't been reordered ahead
of this check.
The is necessary for RCU mode.
Link: https://lkml.kernel.org/r/[email protected]
Fixes: 54a611b60590 ("Maple Tree: add new data structure")
Cc: [email protected]
Signed-off-by: Liam R. Howlett <[email protected]>
Signed-off-by: Greg Kroah-Hartman <[email protected]>
1 file changed
