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

From: Vincent Whitchurch <vincent.whitchurch@axis.com>
To: <broonie@kernel.org>, <krzysztof.kozlowski@linaro.org>,
	<andi@etezian.org>
Cc: <kernel@axis.com>,
	Vincent Whitchurch <vincent.whitchurch@axis.com>,
	<alim.akhtar@samsung.com>, <linux-spi@vger.kernel.org>,
	<linux-kernel@vger.kernel.org>,
	<linux-samsung-soc@vger.kernel.org>,
	<linux-arm-kernel@lists.infradead.org>
Subject: [PATCH v2 3/4] spi: Split transfers larger than max size
Date: Tue, 27 Sep 2022 13:21:16 +0200	[thread overview]
Message-ID: <20220927112117.77599-4-vincent.whitchurch@axis.com> (raw)
In-Reply-To: <20220927112117.77599-1-vincent.whitchurch@axis.com>

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>
---
 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


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