linux-kernel - [PATCH v2 3/4] spi: Split transfers larger than max size

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Message-ID: <20220927112117.77599-4-vincent.whitchurch@axis.com>
Date:   Tue, 27 Sep 2022 13:21:16 +0200
From:   Vincent Whitchurch <vincent.whitchurch@...s.com>
To:     <broonie@...nel.org>, <krzysztof.kozlowski@...aro.org>,
        <andi@...zian.org>
CC:     <kernel@...s.com>,
        Vincent Whitchurch <vincent.whitchurch@...s.com>,
        <alim.akhtar@...sung.com>, <linux-spi@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>,
        <linux-samsung-soc@...r.kernel.org>,
        <linux-arm-kernel@...ts.infradead.org>
Subject: [PATCH v2 3/4] 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@...s.com>
---
 drivers/spi/spi.c | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/drivers/spi/spi.c b/drivers/spi/spi.c
index f41a8c2752b8..44e4352d948b 100644
--- 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) {
-- 
2.34.1