spi: Split transfers larger than max size

A couple of drivers call spi_split_transfers_maxsize() from their
->prepare_message() callbacks to split transfers which are too big for
them to handle.  Add support in the core to do this based on
->max_transfer_size() to avoid code duplication.

Signed-off-by: Vincent Whitchurch <vincent.whitchurch@axis.com>
Link: https://lore.kernel.org/r/20220927112117.77599-4-vincent.whitchurch@axis.com
Signed-off-by: Mark Brown <broonie@kernel.org>

diff --git a/drivers/spi/spi.c b/drivers/spi/spi.c
index 3b7efdd..a4771f6 100644 (file)
--- a/drivers/spi/spi.c
+++ b/drivers/spi/spi.c
@@ -1649,6 +1649,15 @@ static int __spi_pump_transfer_message(struct spi_controller *ctlr,
 
        trace_spi_message_start(msg);
 
+       ret = spi_split_transfers_maxsize(ctlr, msg,
+                                         spi_max_transfer_size(msg->spi),
+                                         GFP_KERNEL | GFP_DMA);
+       if (ret) {
+               msg->status = ret;
+               spi_finalize_current_message(ctlr);
+               return ret;
+       }
+
        if (ctlr->prepare_message) {
                ret = ctlr->prepare_message(ctlr, msg);
                if (ret) {