spi: Catch improper use of PTP system timestamping API

We can catch whether the SPI controller has declared it can take care of
software timestamping transfers, but didn't. So do it.

Signed-off-by: Vladimir Oltean <olteanv@gmail.com>
Link: https://lore.kernel.org/r/20191227012444.1204-1-olteanv@gmail.com
Signed-off-by: Mark Brown <broonie@kernel.org>

diff --git a/drivers/spi/spi.c b/drivers/spi/spi.c
index 5e4c453..5485ef8 100644 (file)
--- a/drivers/spi/spi.c
+++ b/drivers/spi/spi.c
@@ -1680,6 +1680,13 @@ void spi_finalize_current_message(struct spi_controller *ctlr)
                }
        }
 
+       if (unlikely(ctlr->ptp_sts_supported)) {
+               list_for_each_entry(xfer, &mesg->transfers, transfer_list) {
+                       WARN_ON_ONCE(xfer->ptp_sts && !xfer->timestamped_pre);
+                       WARN_ON_ONCE(xfer->ptp_sts && !xfer->timestamped_post);
+               }
+       }
+
        spi_unmap_msg(ctlr, mesg);
 
        if (ctlr->cur_msg_prepared && ctlr->unprepare_message) {