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authorFelix Beck <felix.beck@de.ibm.com>2011-01-05 12:47:47 +0100
committerMartin Schwidefsky <sky@mschwide.boeblingen.de.ibm.com>2011-01-05 12:47:27 +0100
commitc2567f8ffa2704f6f2f81013e9a590deca5a865f (patch)
tree83c71b7139d21b51166f085f08bcefcaaa808b93 /drivers/s390/crypto/zcrypt_cex2a.c
parent2ade1fab026b4a103f0105ec4b47654fc2f729c7 (diff)
downloadlinux-c2567f8ffa2704f6f2f81013e9a590deca5a865f.tar.bz2
[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 <felix.beck@de.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Diffstat (limited to 'drivers/s390/crypto/zcrypt_cex2a.c')
-rw-r--r--drivers/s390/crypto/zcrypt_cex2a.c6
1 files changed, 5 insertions, 1 deletions
diff --git a/drivers/s390/crypto/zcrypt_cex2a.c b/drivers/s390/crypto/zcrypt_cex2a.c
index def0901767de..2176d00b395e 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;