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authorAl Viro <viro@zeniv.linux.org.uk>2006-03-18 15:05:53 -0500
committerAl Viro <viro@zeniv.linux.org.uk>2006-03-18 18:34:15 -0500
commit334e94de9bea353156abd6f2242d3cc4a24562b0 (patch)
treeff4a253e9e3bf487be03bf58727a7ea40a34ba87 /block/ll_rw_blk.c
parente17a9489b4a686bb5e9615e1d375c67619cb99c5 (diff)
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[PATCH] deal with rmmod/put_io_context() races
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Diffstat (limited to 'block/ll_rw_blk.c')
-rw-r--r--block/ll_rw_blk.c2
1 files changed, 2 insertions, 0 deletions
diff --git a/block/ll_rw_blk.c b/block/ll_rw_blk.c
index caa8fcf5474..6dc76918205 100644
--- a/block/ll_rw_blk.c
+++ b/block/ll_rw_blk.c
@@ -3477,10 +3477,12 @@ void put_io_context(struct io_context *ioc)
BUG_ON(atomic_read(&ioc->refcount) == 0);
if (atomic_dec_and_test(&ioc->refcount)) {
+ rcu_read_lock();
if (ioc->aic && ioc->aic->dtor)
ioc->aic->dtor(ioc->aic);
if (ioc->cic && ioc->cic->dtor)
ioc->cic->dtor(ioc->cic);
+ rcu_read_unlock();
kmem_cache_free(iocontext_cachep, ioc);
}