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0d3e8f68b1
See https://github.com/raspberrypi/linux/issues/3981 An unknown unsafe memory access can result in the ep_state variable in xhci_virt_ep being trampled with a stuck SET_DEQ_PENDING state despite successful completion of a Set TR Deq Pointer command. All URB enqueue/dequeue calls for the endpoint will fail in this state so no transfers are possible until the device is reconnected. As a workaround, clear the flag if we see it set and issue a new Set TR Deq command anyway - this should be harmless, as a prior Set TR Deq command will only have been issued in the Stopped state, and if the endpoint is Running then the controller is required to ignore it and respond with a Context State Error event TRB. Signed-off-by: Jonathan Bell <jonathan@raspberrypi.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.
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