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[PATCH] deal with rmmod/put_io_context() races

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Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
This commit is contained in:
Al Viro
2006-03-18 15:05:53 -05:00
parent e17a9489b4
commit 334e94de9b
3 changed files with 32 additions and 1 deletions
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15
block/as-iosched.c
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@@ -182,6 +182,9 @@ struct as_rq {
static kmem_cache_t *arq_pool;
static atomic_t ioc_count = ATOMIC_INIT(0);
static struct completion *ioc_gone;
static void as_move_to_dispatch(struct as_data *ad, struct as_rq *arq);
static void as_antic_stop(struct as_data *ad);
@@ -193,11 +196,14 @@ static void as_antic_stop(struct as_data *ad);
static void free_as_io_context(struct as_io_context *aic)
{
kfree(aic);
if (atomic_dec_and_test(&ioc_count) && ioc_gone)
complete(ioc_gone);
}
static void as_trim(struct io_context *ioc)
{
kfree(ioc->aic);
if (ioc->aic)
free_as_io_context(ioc->aic);
ioc->aic = NULL;
}
@@ -226,6 +232,7 @@ static struct as_io_context *alloc_as_io_context(void)
ret->seek_total = 0;
ret->seek_samples = 0;
ret->seek_mean = 0;
atomic_inc(&ioc_count);
}
return ret;
@@ -1900,7 +1907,13 @@ static int __init as_init(void)
static void __exit as_exit(void)
{
DECLARE_COMPLETION(all_gone);
elv_unregister(&iosched_as);
ioc_gone = &all_gone;
barrier();
if (atomic_read(&ioc_count))
complete(ioc_gone);
synchronize_rcu();
kmem_cache_destroy(arq_pool);
}