diff --git a/mm/zswap.c b/mm/zswap.c
index 4f2e652e8ad3..c59045b59ffe 100644
--- a/mm/zswap.c
+++ b/mm/zswap.c
@@ -749,6 +749,10 @@ static int zswap_cpu_comp_prepare(unsigned int cpu, struct hlist_node *node)
 		goto fail;
 	}
 
+	/*
+	 * In case of an error, crypto_alloc_acomp_node() returns an
+	 * error pointer, never NULL.
+	 */
 	acomp = crypto_alloc_acomp_node(pool->tfm_name, 0, 0, cpu_to_node(cpu));
 	if (IS_ERR(acomp)) {
 		pr_err("could not alloc crypto acomp %s : %pe\n",
@@ -757,6 +761,7 @@ static int zswap_cpu_comp_prepare(unsigned int cpu, struct hlist_node *node)
 		goto fail;
 	}
 
+	/* acomp_request_alloc() returns NULL in case of an error. */
 	req = acomp_request_alloc(acomp);
 	if (!req) {
 		pr_err("could not alloc crypto acomp_request %s\n",
@@ -802,7 +807,7 @@ static int zswap_cpu_comp_dead(unsigned int cpu, struct hlist_node *node)
 	struct crypto_acomp *acomp;
 	u8 *buffer;
 
-	if (IS_ERR_OR_NULL(acomp_ctx))
+	if (!acomp_ctx)
 		return 0;
 
 	mutex_lock(&acomp_ctx->mutex);
@@ -817,8 +822,11 @@ static int zswap_cpu_comp_dead(unsigned int cpu, struct hlist_node *node)
 	/*
 	 * Do the actual freeing after releasing the mutex to avoid subtle
 	 * locking dependencies causing deadlocks.
+	 *
+	 * If there was an error in allocating @acomp_ctx->req, it
+	 * would be set to NULL.
 	 */
-	if (!IS_ERR_OR_NULL(req))
+	if (req)
 		acomp_request_free(req);
 	if (!IS_ERR_OR_NULL(acomp))
 		crypto_free_acomp(acomp);