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spi: Split transfers larger than max size

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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>
This commit is contained in:
Vincent Whitchurch 2022-09-27 13:21:16 +02:00 committed by Mark Brown
parent 0c17ba73c0
commit 8d699ff955
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1 changed files with 9 additions and 0 deletions
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9
drivers/spi/spi.c
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@ -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) {