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IB/rxe: put the pool on allocation failure 

If the allocation of elem fails, it is not sufficient to simply check
for NULL and return.  We need to also put our reference on the pool or
else we will leave the pool with a permanent ref count and we will never
be able to free it.

Fixes: 4831ca9e4a ("IB/rxe: check for allocation failure on elem")
Suggested-by: Leon Romanovsky <leon@kernel.org>
Signed-off-by: Doug Ledford <dledford@redhat.com>
This commit is contained in:
Doug Ledford 2017-10-09 09:11:32 -04:00
parent 4831ca9e4a
commit 6b9f8970cd
1 changed files with 9 additions and 7 deletions
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16
drivers/infiniband/sw/rxe/rxe_pool.c
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@ -394,23 +394,25 @@ void *rxe_alloc(struct rxe_pool *pool)
kref_get(&pool->rxe->ref_cnt);
if (atomic_inc_return(&pool->num_elem) > pool->max_elem) {
atomic_dec(&pool->num_elem);
rxe_dev_put(pool->rxe);
rxe_pool_put(pool);
return NULL;
}
if (atomic_inc_return(&pool->num_elem) > pool->max_elem)
goto out_put_pool;
elem = kmem_cache_zalloc(pool_cache(pool),
(pool->flags & RXE_POOL_ATOMIC) ?
GFP_ATOMIC : GFP_KERNEL);
if (!elem)
return NULL;
goto out_put_pool;
elem->pool = pool;
kref_init(&elem->ref_cnt);
return elem;
out_put_pool:
atomic_dec(&pool->num_elem);
rxe_dev_put(pool->rxe);
rxe_pool_put(pool);
return NULL;
}
void rxe_elem_release(struct kref *kref)