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Corey Minyard 78ba2faf71 [PATCH] IPMI: Fix some RCU problems

Fix some RCU problem pointed out by Paul McKenney of IBM.  These are:

The wholesale move of the command receivers list into a new list was not
safe because the list will point to the new tail during a traversal, so the
traversal will never end on a reader if this happens during a read.

Memory barriers were needed to handle proper ordering of the setting of the
IPMI interface as valid.  Readers might not see proper ordering of data
otherwise.

In ipmi_smi_watcher_register(), the use of the _rcu suffix on the list is
unnecessary.

This require the list_splice_init_rcu() patch previously posted.

Signed-off-by: Corey Minyard <minyard@acm.org>
Cc: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

2007-02-11 10:51:31 -08:00

ipmi_bt_sm.c

[PATCH] IPMI: remove zero inits

2006-12-10 09:55:40 -08:00

ipmi_devintf.c

[PATCH] IPMI: remove zero inits

2006-12-10 09:55:40 -08:00

ipmi_kcs_sm.c

[PATCH] IPMI: increase KCS message size

2006-12-07 08:39:48 -08:00

ipmi_msghandler.c

[PATCH] IPMI: Fix some RCU problems