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With commited6776c96c("s390/crypto: remove retry loop with sleep from PAES pkey invocation") the retry loop to retry derivation of a protected key from a secure key has been removed. This was based on the assumption that theses retries are not needed any more as proper retries are done in the zcrypt layer. However, tests have revealed that there exist some cases with master key change in the HSM and immediately (< 1 second) attempt to derive a protected key from a secure key with exact this HSM may eventually fail. The low level functions in zcrypt_ccamisc.c and zcrypt_ep11misc.c detect and report this temporary failure and report it to the caller as -EBUSY. The re-established retry loop in the paes implementation catches exactly this -EBUSY and eventually may run some retries. Fixes:ed6776c96c("s390/crypto: remove retry loop with sleep from PAES pkey invocation") Signed-off-by: Harald Freudenberger <freude@linux.ibm.com> Reviewed-by: Ingo Franzki <ifranzki@linux.ibm.com> Reviewed-by: Holger Dengler <dengler@linux.ibm.com> Signed-off-by: Alexander Gordeev <agordeev@linux.ibm.com>
Linux kernel
============
There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.
In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``. The formatted documentation can also be read online at:
https://www.kernel.org/doc/html/latest/
There are various text files in the Documentation/ subdirectory,
several of them using the reStructuredText markup notation.
Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.