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To ensure correct operation between the driver and PSM with respect to managing the SDMA request ring, it is important that the status for a particular request slot is set at the correct time. Otherwise, PSM can get out of sync with the driver, which could lead to hangs or errors on new requests. Properly determining of when to set the error status of a SDMA slot depends on knowing exactly when the last txreq for that request has been completed. This in turn requires that the driver knows exactly how many requests have been generated and how many of those requests have been successfully submitted to the SDMA queue. The previous implementation of the mid-layer SDMA API did not provide a way for the caller of sdma_send_txlist() to know how many of the txreqs in the input list have actually been submitted without traversing the list and counting. Since sdma_send_txlist() already traverses the list in order to process it, requiring such traversal in the caller is completely unnecessary. Therefore, it is much easier to enhance sdma_send_txlist() to return the number of successfully submitted txreqs. This, in turn, allows the caller to accurately determine the progress of the SDMA request and, therefore, correctly set the error status at the right time. Reviewed-by: Mike Marciniszyn <mike.marciniszyn@intel.com> Signed-off-by: Mitko Haralanov <mitko.haralanov@intel.com> Signed-off-by: Jubin John <jubin.john@intel.com> Signed-off-by: Doug Ledford <dledford@redhat.com> |
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| rdma | ||
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| staging.c | ||