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Introduce a new xhci_hc_died() function that takes care of handling pending commands and URBs if a host controller becomes unresponsive. This addresses issues on hotpluggable xhci controllers that disappear from the bus suddenly, often while the bus (PCI) remove function is still being processed. xhci_hc_died() sets a XHCI_STATUS_DYING flag to prevent new URBs and commands or to be queued. The flag also ensures xhci_hc_died() will give back pending commands and URBs once. Host is considered dead if register read returns 0xffffffff, or host fails to abort the command ring, or fails stopping an endpoint after trying for 5 seconds. Signed-off-by: Mathias Nyman <mathias.nyman@linux.intel.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> |
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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.