499022396a
A surprise link down may retrain very quickly causing the same slot generate a link up event before handling the link down event completes. Since the link is active, the power off work queued from the first link down will cause a second down event when power is disabled. However, the link up event sets the slot state to POWERON_STATE before the event to handle this is enqueued, making the second down event believe it needs to do something. This creates constant link up and down event cycle. To prevent this it is better to handle each event at the time in order it occurred, so change the driver to use ordered workqueue instead. A normal device hotplug triggers two events (presense detect and link up) that are already handled properly in the driver but we currently log an error if we find an existing device in the slot. Since this is not an error change the log level to be debug instead to avoid scaring users. This is based on the original work by Ashok Raj. Link: https://patchwork.kernel.org/patch/9469023 Suggested-by: Bjorn Helgaas <bhelgaas@google.com> Signed-off-by: Mika Westerberg <mika.westerberg@linux.intel.com> Signed-off-by: Bjorn Helgaas <bhelgaas@google.com> |
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| kernel | ||
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README
Linux kernel ============ This file was moved to Documentation/admin-guide/README.rst Please notice that there are several guides for kernel developers and users. These guides can be rendered in a number of formats, like HTML and PDF. In order to build the documentation, use ``make htmldocs`` or ``make pdfdocs``. 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.