From c2567f8ffa2704f6f2f81013e9a590deca5a865f Mon Sep 17 00:00:00 2001 From: Felix Beck Date: Wed, 5 Jan 2011 12:47:47 +0100 Subject: [S390] zcrypt: cope with cca restriction of cex3 The cca on the crypto adapter has a restriction in the size of the exponent if a key with a modulus bigger than 2048 bit is used. Thus in that case we have to avoid that the crypto device driver thinks the adapter is defect and sets it offline. Therfore a new member for the zcrypt_device struct called max_exp_bit_length is introduced. This will be set the first time the cca returns the error code function not implemented. If this is done with an adapter twice it will return -EINVAL. Signed-off-by: Felix Beck Signed-off-by: Martin Schwidefsky --- drivers/s390/crypto/zcrypt_cex2a.c | 6 +++++- 1 file changed, 5 insertions(+), 1 deletion(-) (limited to 'drivers/s390/crypto/zcrypt_cex2a.c') diff --git a/drivers/s390/crypto/zcrypt_cex2a.c b/drivers/s390/crypto/zcrypt_cex2a.c index def0901767d..2176d00b395 100644 --- a/drivers/s390/crypto/zcrypt_cex2a.c +++ b/drivers/s390/crypto/zcrypt_cex2a.c @@ -441,6 +441,7 @@ static int zcrypt_cex2a_probe(struct ap_device *ap_dev) zdev->max_mod_size = CEX2A_MAX_MOD_SIZE; zdev->short_crt = 1; zdev->speed_rating = CEX2A_SPEED_RATING; + zdev->max_exp_bit_length = CEX2A_MAX_MOD_SIZE; break; case AP_DEVICE_TYPE_CEX3A: zdev = zcrypt_device_alloc(CEX3A_MAX_RESPONSE_SIZE); @@ -450,8 +451,11 @@ static int zcrypt_cex2a_probe(struct ap_device *ap_dev) zdev->type_string = "CEX3A"; zdev->min_mod_size = CEX2A_MIN_MOD_SIZE; zdev->max_mod_size = CEX2A_MAX_MOD_SIZE; - if (ap_4096_commands_available(ap_dev->qid)) + zdev->max_exp_bit_length = CEX2A_MAX_MOD_SIZE; + if (ap_4096_commands_available(ap_dev->qid)) { zdev->max_mod_size = CEX3A_MAX_MOD_SIZE; + zdev->max_exp_bit_length = CEX3A_MAX_MOD_SIZE; + } zdev->short_crt = 1; zdev->speed_rating = CEX3A_SPEED_RATING; break; -- cgit v1.2.3-70-g09d2