The patch titled
fix theoretical ccids_{read,write}_lock() race
has been added to the -mm tree. Its filename is
fix-theoretical-ccids_readwrite_lock-race.patch
*** Remember to use Documentation/SubmitChecklist when testing your code ***
See http://www.zip.com.au/~akpm/linux/patches/stuff/added-to-mm.txt to find
out what to do about this
------------------------------------------------------
Subject: fix theoretical ccids_{read,write}_lock() race
From: Oleg Nesterov <oleg@xxxxxxxxxx>
Make sure that spin_unlock_wait() is properly ordered wrt atomic_inc().
(akpm: can't we convert this code to use rwlocks?)
Signed-off-by: Oleg Nesterov <oleg@xxxxxxxxxx>
Cc: Arnaldo Carvalho de Melo <acme@xxxxxxxxxx>
Cc: Ingo Molnar <mingo@xxxxxxx>
Cc: "David S. Miller" <davem@xxxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
net/dccp/ccid.c | 1 +
1 files changed, 1 insertion(+)
diff -puN net/dccp/ccid.c~fix-theoretical-ccids_readwrite_lock-race net/dccp/ccid.c
--- a/net/dccp/ccid.c~fix-theoretical-ccids_readwrite_lock-race
+++ a/net/dccp/ccid.c
@@ -40,6 +40,7 @@ static inline void ccids_write_unlock(vo
static inline void ccids_read_lock(void)
{
atomic_inc(&ccids_lockct);
+ smp_mb__after_atomic_inc();
spin_unlock_wait(&ccids_lock);
}
_
Patches currently in -mm which might be from oleg@xxxxxxxxxx are
fix-theoretical-ccids_readwrite_lock-race.patch
i386-remove-unnecessary-code.patch
clone-flag-clone_parent_tidptr-leaves-invalid-results-in-memory.patch
do_sys_poll-simplify-playing-with-on-stack-data.patch
do_poll-return-eintr-when-signalled.patch
idr_remove_all-kill-unused-variable.patch
workqueue-debug-flushing-deadlocks-with-lockdep.patch
workqueue-debug-work-related-deadlocks-with-lockdep.patch
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