[PATCH] spi: sprd: fix error pointer deref after DMA setup failure

[Johan Hovold <johan@kernel.org>]

The driver falls back to PIO mode if DMA setup fails during probe.

Make sure to check the dma.enabled flag before trying to release the DMA
channels also on late probe errors to avoid dereferencing an error
pointer (or attempting to release a channel a second time).

This issue was flagged by Sashiko when reviewing a devres allocation
conversion patch.

Fixes: 386119bc7be9 ("spi: sprd: spi: sprd: Add DMA mode support")
Link: https://sashiko.dev/#/patchset/20260505072909.618363-1-johan%40kernel.org?part=10
Cc: stable@vger.kernel.org	# 5.1
Cc: Lanqing Liu <lanqing.liu@unisoc.com>
Signed-off-by: Johan Hovold <johan@kernel.org>
---

Note that this one is based on 7.1-rc3 and will cause a trivial conflict
with the devres allocation patch in spi/for-7.2 branch.

Let me know if your prefer a rebase on top of the conversion instead
(which will result in a similar context conflict when backporting).

Johan


 drivers/spi/spi-sprd.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/spi/spi-sprd.c b/drivers/spi/spi-sprd.c
index fd3fd0ce122c..acebf9c2e795 100644
--- a/drivers/spi/spi-sprd.c
+++ b/drivers/spi/spi-sprd.c
@@ -991,7 +991,8 @@ static int sprd_spi_probe(struct platform_device *pdev)
 disable_clk:
 	clk_disable_unprepare(ss->clk);
 release_dma:
-	sprd_spi_dma_release(ss);
+	if (ss->dma.enable)
+		sprd_spi_dma_release(ss);
 free_controller:
 	spi_controller_put(sctlr);
 
-- 
2.53.0