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The i40e driver uses a bit lock to indicate when a Tx timestamp is in progress to avoid attempting to timestamp multiple packets at once. This is required because hardware only has registers to handle one request at a time. There is a corner case where we failed to cleanup the bit lock after a failed transmit. This can potentially result in a state bit being locked forever. Add some cleanup code to i40e_xmit_frame_ring to check and make sure we cleanup incase of these failures. We also modify i40e_tx_map to return an error code indication DMA failure. Reported-by: Reported-by: David Mirabito <davidm@metamako.com> Signed-off-by: Jacob Keller <jacob.e.keller@intel.com> Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
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.