netdev - [PATCH net-next 2/2] Crypto/chcr: Checking cra_refcnt before unregistering the algorithms

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Date:   Wed, 10 Jun 2020 02:54:32 +0530
From:   Ayush Sawal <ayush.sawal@...lsio.com>
To:     davem@...emloft.net, herbert@...dor.apana.org.au
Cc:     netdev@...r.kernel.org, manojmalviya@...lsio.com,
        Ayush Sawal <ayush.sawal@...lsio.com>
Subject: [PATCH net-next 2/2] Crypto/chcr: Checking cra_refcnt before unregistering the algorithms

This patch puts a check for algorithm unregister, to avoid removal of
driver if the algorithm is under use.

Signed-off-by: Ayush Sawal <ayush.sawal@...lsio.com>
---
 drivers/crypto/chelsio/chcr_algo.c | 18 ++++++++++++++----
 1 file changed, 14 insertions(+), 4 deletions(-)

diff --git a/drivers/crypto/chelsio/chcr_algo.c b/drivers/crypto/chelsio/chcr_algo.c
index f8b55137cf7d..4c2553672b6f 100644
--- a/drivers/crypto/chelsio/chcr_algo.c
+++ b/drivers/crypto/chelsio/chcr_algo.c
@@ -4391,22 +4391,32 @@ static int chcr_unregister_alg(void)
 	for (i = 0; i < ARRAY_SIZE(driver_algs); i++) {
 		switch (driver_algs[i].type & CRYPTO_ALG_TYPE_MASK) {
 		case CRYPTO_ALG_TYPE_SKCIPHER:
-			if (driver_algs[i].is_registered)
+			if (driver_algs[i].is_registered && refcount_read(
+			    &driver_algs[i].alg.skcipher.base.cra_refcnt)
+			    == 1) {
 				crypto_unregister_skcipher(
 						&driver_algs[i].alg.skcipher);
+				driver_algs[i].is_registered = 0;
+			}
 			break;
 		case CRYPTO_ALG_TYPE_AEAD:
-			if (driver_algs[i].is_registered)
+			if (driver_algs[i].is_registered && refcount_read(
+			    &driver_algs[i].alg.aead.base.cra_refcnt) == 1) {
 				crypto_unregister_aead(
 						&driver_algs[i].alg.aead);
+				driver_algs[i].is_registered = 0;
+			}
 			break;
 		case CRYPTO_ALG_TYPE_AHASH:
-			if (driver_algs[i].is_registered)
+			if (driver_algs[i].is_registered && refcount_read(
+			    &driver_algs[i].alg.hash.halg.base.cra_refcnt)
+			    == 1) {
 				crypto_unregister_ahash(
 						&driver_algs[i].alg.hash);
+				driver_algs[i].is_registered = 0;
+			}
 			break;
 		}
-		driver_algs[i].is_registered = 0;
 	}
 	return 0;
 }
-- 
2.26.0.rc1.11.g30e9940