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commit597c56e372upstream. This change fixes a data corruption issue occurred on USB hard disk for the case that bounce buffer is used during transferring data. While updating data between sg list and bounce buffer, current implementation passes mapped sg number (urb->num_mapped_sgs) to sg_pcopy_from_buffer() and sg_pcopy_to_buffer(). This causes data not get copied if target buffer is located in the elements after mapped sg elements. This change passes sg number for full list to fix issue. Besides, for copying data from bounce buffer, calling dma_unmap_single() on the bounce buffer before copying data to sg list can avoid cache issue. Fixes:f9c589e142("xhci: TD-fragment, align the unsplittable case with a bounce buffer") Cc: <stable@vger.kernel.org> # v4.8+ Signed-off-by: Henry Lin <henryl@nvidia.com> Signed-off-by: Mathias Nyman <mathias.nyman@linux.intel.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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.