[Bug 217242] CPU hard lockup related to xhci/dma

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https://bugzilla.kernel.org/show_bug.cgi?id=217242

--- Comment #20 from Mathias Nyman (mathias.nyman@xxxxxxxxxxxxxxx) ---
Created attachment 304134
  --> https://bugzilla.kernel.org/attachment.cgi?id=304134&action=edit
debug patch comparing free trbs

Debugging patch for ring expansion and 

Patch recalculates free trbs and compares it to the old tracked value of free
trbs. Prints out a message if there is a new mismatch.

Patch also includes a new way of checking if ring needs expansion, and by how
much. used only to show it when driver expands ring based on old code

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