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The both functions zcrypt_send_cprb() and zcrypt_send_ep11_cprb() are used to send CPRBs in-kernel from different sources. For example the pkey module may call one of the functions in zcrypt_ep11misc.c to trigger a derive of a protected key from a secure key blob via an existing crypto card. These both functions are then the internal API to send the CPRB and receive the response. All the ioctl functions to send an CPRB down to the addressed crypto card use some kind of retry mechanism. When the first attempt fails with ENODEV, a bus rescan is triggered and a loop with retries is carried out. For the both named internal functions there was never any retry attempt made. This patch now introduces the retry code even for this both internal functions to have effectively same behavior on sending an CPRB from an in-kernel source and sending an CPRB from userspace via ioctl. 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>
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 Restructured Text 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.