0ff06c44ef
Prior to dma unmap/free operations the ism driver tries to ensure that the memory is no longer accessed by the HW. When errors during deregistration of memory regions from the HW occur the ism driver will not unmap/free this memory. When we receive notification from the hypervisor that a PCI function has been detached we can no longer access the device and would never unmap/free these memory regions which led to complaints by the DMA debug API. Treat this kind of errors during the deregistration of memory regions from the HW as success since it is already ensured that the memory is no longer accessed by HW. Reported-by: Karsten Graul <kgraul@linux.ibm.com> Reported-by: Hans Wippel <hwippel@linux.ibm.com> Signed-off-by: Sebastian Ott <sebott@linux.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.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.