linux-kernel - [PATCH v2] spi: spi-geni-qcom: correctly handle -EPROBE_DEFER from dma_request

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Message-Id: <20230615-topic-sm8550-upstream-fix-spi-geni-qcom-probe-v2-1-670c3d9e8c9c@linaro.org>
Date:   Thu, 15 Jun 2023 14:51:45 +0200
From:   Neil Armstrong <neil.armstrong@...aro.org>
To:     Andy Gross <agross@...nel.org>,
        Bjorn Andersson <andersson@...nel.org>,
        Konrad Dybcio <konrad.dybcio@...aro.org>,
        Mark Brown <broonie@...nel.org>, Vinod Koul <vkoul@...nel.org>,
        Dan Carpenter <error27@...il.com>
Cc:     linux-arm-msm@...r.kernel.org, linux-spi@...r.kernel.org,
        linux-kernel@...r.kernel.org,
        Neil Armstrong <neil.armstrong@...aro.org>
Subject: [PATCH v2] spi: spi-geni-qcom: correctly handle -EPROBE_DEFER from
 dma_request_chan()

Now spi_geni_grab_gpi_chan() errors are correctly reported, the
-EPROBE_DEFER error should be returned from probe in case the
GPI dma driver is built as module and/or not probed yet.

Fixes: b59c122484ec ("spi: spi-geni-qcom: Add support for GPI dma")
Fixes: 6532582c353f ("spi: spi-geni-qcom: fix error handling in spi_geni_grab_gpi_chan()")
Signed-off-by: Neil Armstrong <neil.armstrong@...aro.org>
---
Changes in v2:
- added braces to second side of the if statement
- Link to v1: https://lore.kernel.org/r/20230615-topic-sm8550-upstream-fix-spi-geni-qcom-probe-v1-1-6da9bf2db4a4@linaro.org
---
 drivers/spi/spi-geni-qcom.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/spi/spi-geni-qcom.c b/drivers/spi/spi-geni-qcom.c
index 206cc04bb1ed..26ce959d98df 100644
--- a/drivers/spi/spi-geni-qcom.c
+++ b/drivers/spi/spi-geni-qcom.c
@@ -661,6 +661,8 @@ static int spi_geni_init(struct spi_geni_master *mas)
 			geni_se_select_mode(se, GENI_GPI_DMA);
 			dev_dbg(mas->dev, "Using GPI DMA mode for SPI\n");
 			break;
+		} else if (ret == -EPROBE_DEFER) {
+			goto out_pm;
 		}
 		/*
 		 * in case of failure to get gpi dma channel, we can still do the

---
base-commit: 925294c9aa184801cc0a451b69a18dd0fe7d847d
change-id: 20230615-topic-sm8550-upstream-fix-spi-geni-qcom-probe-9a97cb6b5ea6

Best regards,
-- 
Neil Armstrong <neil.armstrong@...aro.org>