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spi: qup: fix error pointer deref after DMA setup failure

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

Make sure to the clear the DMA channel pointers on setup failure to
avoid dereferencing an error pointer (or attempting to release a channel
a second time) on later probe errors or driver unbind.

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

Fixes: 612762e82a ("spi: qup: Add DMA capabilities")
Link: https://sashiko.dev/#/patchset/20260505072909.618363-1-johan%40kernel.org?part=4
Cc: stable@vger.kernel.org	# 4.1
Signed-off-by: Johan Hovold <johan@kernel.org>
Link: https://patch.msgid.link/20260512074334.914735-1-johan@kernel.org
Signed-off-by: Mark Brown <broonie@kernel.org>
This commit is contained in:
Johan Hovold 2026-05-12 09:43:34 +02:00 committed by Mark Brown
parent 496ba79b94
commit a7e8f3efd5
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1 changed files with 3 additions and 0 deletions
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3
drivers/spi/spi-qup.c
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@ -996,8 +996,11 @@ static int spi_qup_init_dma(struct spi_controller *host, resource_size_t base)
err:
dma_release_channel(host->dma_tx);
host->dma_tx = NULL;
err_tx:
dma_release_channel(host->dma_rx);
host->dma_rx = NULL;
return ret;
}