a43babc059
[ Upstream commite0831e7af4] In order to do DMAs, the QAT device requires that the scatterlist structures are mapped and translated into a format that the firmware can understand. This is defined as the composition of a scatter gather list (SGL) descriptor header, the struct qat_alg_buf_list, plus a variable number of flat buffer descriptors, the struct qat_alg_buf. The allocation and mapping of these data structures is done each time a request is received from the skcipher and aead APIs. In an OOM situation, this behaviour might lead to a dead-lock if an allocation fails. Based on the conversation in [1], increase the size of the aead and skcipher request contexts to include an SGL descriptor that can handle a maximum of 4 flat buffers. If requests exceed 4 entries buffers, memory is allocated dynamically. [1] https://lore.kernel.org/linux-crypto/20200722072932.GA27544@gondor.apana.org.au/ Cc: stable@vger.kernel.org Fixes:d370cec321("crypto: qat - Intel(R) QAT crypto interface") Reported-by: Mikulas Patocka <mpatocka@redhat.com> Signed-off-by: Giovanni Cabiddu <giovanni.cabiddu@intel.com> Reviewed-by: Marco Chiappero <marco.chiappero@intel.com> Reviewed-by: Wojciech Ziemba <wojciech.ziemba@intel.com> Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au> Stable-dep-of:cf5bb835b7("crypto: qat - fix DMA transfer direction") Signed-off-by: Sasha Levin <sashal@kernel.org>
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.