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This reverts commitb7493e91c1. On its own, querying RDEV for a MAC address works fine. But when upgrading from a qeth that previously queried DDEV on a z/VM NIC (ie. any kernel with commitec61bd2fd2), the RDEV query now returns a _different_ MAC address than the DDEV query. If the NIC is configured with MACPROTECT, z/VM apparently requires us to use the MAC that was initially returned (on DDEV) and registered. So after upgrading to a kernel that uses RDEV, the SETVMAC registration cmd for the new MAC address fails and we end up with a non-operabel interface. To avoid regressions on upgrade, switch back to using DDEV for the MAC address query. The downgrade path (first RDEV, later DDEV) is fine, in this case both queries return the same MAC address. Fixes:b7493e91c1("s390/qeth: use Read device to query hypervisor for MAC") Reported-by: Michal Kubecek <mkubecek@suse.com> Tested-by: Karsten Graul <kgraul@linux.ibm.com> Signed-off-by: Julian Wiedmann <jwi@linux.ibm.com> Signed-off-by: David S. Miller <davem@davemloft.net>
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.
See Documentation/00-INDEX for a list of what is contained in each file.
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.