s390/crypto: remove retry loop with sleep from PAES pkey invocation

Upon calling the pkey module to (re-)derive an protected
key from a secure key the PAES implementation did a retry
3 times with an 1000 ms sleep after each failure. This
patch removes this retry loop - retries should be done
if needed in a lower layer but the consumer of the pkey
module functions should not be bothered with retries.

Signed-off-by: Harald Freudenberger <freude@linux.ibm.com>
Reviewed-by: Holger Dengler <dengler@linux.ibm.com>
Signed-off-by: Heiko Carstens <hca@linux.ibm.com>

arch/s390/crypto/paes_s390.c

@@ -125,20 +125,8 @@ struct s390_pxts_ctx {
 static inline int __paes_keyblob2pkey(struct key_blob *kb,
 				     struct pkey_protkey *pk)
 {
-	int i, ret;
-
-	/* try three times in case of failure */
-	for (i = 0; i < 3; i++) {
-		if (i > 0 && ret == -EAGAIN && in_task())
-			if (msleep_interruptible(1000))
-				return -EINTR;
-		ret = pkey_keyblob2pkey(kb->key, kb->keylen,
-					pk->protkey, &pk->len, &pk->type);
-		if (ret == 0)
-			break;
-	}
-
-	return ret;
+	return pkey_keyblob2pkey(kb->key, kb->keylen,
+				 pk->protkey, &pk->len, &pk->type);
 }
 
 static inline int __paes_convert_key(struct s390_paes_ctx *ctx)