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On our ZynqMP system we observe, that a NVMe drive that resets itself while doing a firmware update causes a Kernel crash like this: [ 67.720772] pcieport 0000:02:02.0: pciehp: Slot(2): Link Down [ 67.720783] pcieport 0000:02:02.0: pciehp: Slot(2): Card not present [ 67.720795] nvme 0000:04:00.0: PME# disabled [ 67.720849] Internal error: synchronous external abort: 96000010 [#1] PREEMPT SMP [ 67.720853] nwl-pcie fd0e0000.pcie: Slave error Analysis: When nvme_dev_disable() is called because of this PCIe hotplug event, pci_is_enabled() is still true. And accessing the NVMe drive which is currently not available as it's in reboot process causes this "synchronous external abort" on this ARM64 platform. This patch adds the pci_device_is_present() check as well, which returns false in this "Card not present" hot-plug case. With this change, the NVMe driver does not try to access the NVMe registers any more and the FW update finishes without any problems. Signed-off-by: Stefan Roese <sr@denx.de> Signed-off-by: Christoph Hellwig <hch@lst.de> |
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| README | ||
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.