s390/zcrypt: change reply buffer size offering

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Instead of offering the user space given receive buffer size to
the crypto card firmware as limit for the reply message offer
the internal per queue reply buffer size. As the queue's reply
buffer is always adjusted to the max message size possible for
this card this may offer more buffer space. However, now it is
important to check the user space reply buffer on pushing back
the reply. If the reply does not fit into the user space provided
buffer the ioctl will fail with errno EMSGSIZE.

Signed-off-by: Harald Freudenberger <freude@linux.ibm.com>
Reviewed-by: Jürgen Christ <jchrist@linux.ibm.com>
Signed-off-by: Vasily Gorbik <gor@linux.ibm.com>

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Harald Freudenberger 2021-11-23 16:02:47 +01:00 • committed by Vasily Gorbik

parent 383366b580

commit 252a1ff777

1 changed files with 22 additions and 1 deletions

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drivers/s390/crypto/zcrypt_msgtype6.c

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