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A configuration request event may be stale, that is the event may reference a zdev which was already configured. This can happen when a hotplug happens during boot such that the device is discovered and configured in the initial clp_list_pci(), then after initialization we enable events and process the original configuration request which additionally still contains the old disabled function handle leading to a failure during device enablement and subsequent I/O lockout. Fix this by restoring the check that the device to be configured is in standby which was removed in commitf606b3ef47("s390/pci: adapt events for zbus"). This check does not need serialization as we only enable the events after zPCI has fully initialized, which includes the initial clp_list_pci(), rescan only does updates and events are serialized with respect to each other. Fixes:f606b3ef47("s390/pci: adapt events for zbus") Cc: <stable@vger.kernel.org> # 5.8 Reported-by: Shalini Chellathurai Saroja <shalini@linux.ibm.com> Tested-by: Shalini Chellathurai Saroja <shalini@linux.ibm.com> Acked-by: Pierre Morel <pmorel@linux.ibm.com> Signed-off-by: Niklas Schnelle <schnelle@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.