crypto: drbg - report backend_cra_name when allocation fails

Be more verbose and also report ->backend_cra_name when
crypto_alloc_shash() or crypto_alloc_cipher() fail in
drbg_init_hash_kernel() or drbg_init_sym_kernel()
correspondingly.

Example
 DRBG: could not allocate digest TFM handle: hmac(sha256)

Signed-off-by: Sergey Senozhatsky <sergey.senozhatsky@gmail.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>

1 files changed, 4 insertions, 2 deletions

diff --git a/crypto/drbg.c b/crypto/drbg.c
index 5fad297424fc..a7c23146b87f 100644
--- a/crypto/drbg.c
+++ b/crypto/drbg.c
@@ -1635,7 +1635,8 @@ static int drbg_init_hash_kernel(struct drbg_state *drbg)
 
         tfm = crypto_alloc_shash(drbg->core->backend_cra_name, 0, 0);
         if (IS_ERR(tfm)) {
-                pr_info("DRBG: could not allocate digest TFM handle\n");
+                pr_info("DRBG: could not allocate digest TFM handle: %s\n",
+                                drbg->core->backend_cra_name);
                 return PTR_ERR(tfm);
         }
         BUG_ON(drbg_blocklen(drbg) != crypto_shash_digestsize(tfm));
@@ -1686,7 +1687,8 @@ static int drbg_init_sym_kernel(struct drbg_state *drbg)
 
         tfm = crypto_alloc_cipher(drbg->core->backend_cra_name, 0, 0);
         if (IS_ERR(tfm)) {
-                pr_info("DRBG: could not allocate cipher TFM handle\n");
+                pr_info("DRBG: could not allocate cipher TFM handle: %s\n",
+                                drbg->core->backend_cra_name);
                 return PTR_ERR(tfm);
         }
         BUG_ON(drbg_blocklen(drbg) != crypto_cipher_blocksize(tfm));