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Each mailbox channel used by Broadcom SBA RAID driver is a separate HW ring. Currently, Broadcom SBA RAID driver creates one DMA channel using one or more mailbox channels. When we are using more than one mailbox channels for a DMA channel, the sba_request are distributed evenly among multiple mailbox channels which results in sba_request being completed out-of-order. The above described out-of-order completion of sba_request breaks the dma_async_is_complete() API because it assumes DMA cookies are completed in orderly fashion. To ensure correct behaviour of dma_async_is_complete() API, this patch updates Broadcom SBA RAID driver to use only single mailbox channel. If additional mailbox channels are specified in DT then those will be ignored. Signed-off-by: Anup Patel <anup.patel@broadcom.com> Reviewed-by: Ray Jui <ray.jui@broadcom.com> Reviewed-by: Scott Branden <scott.branden@broadcom.com> Signed-off-by: Vinod Koul <vinod.koul@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.