linux-kernel - [PATCH v2 3/3] spi: cadence-quadspi: Assume device could match via platform

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Message-Id: <20250501-n-smatch-fixes-v2-3-d2ad9c1f2e67@linaro.org>
Date: Thu, 01 May 2025 17:02:01 +0200
From: Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
To: Mark Brown <broonie@...nel.org>, 
 Nicolas Ferre <nicolas.ferre@...rochip.com>, 
 Alexandre Belloni <alexandre.belloni@...tlin.com>, 
 Claudiu Beznea <claudiu.beznea@...on.dev>, 
 David Rhodes <david.rhodes@...rus.com>, 
 Richard Fitzgerald <rf@...nsource.cirrus.com>
Cc: linux-spi@...r.kernel.org, linux-arm-kernel@...ts.infradead.org, 
 linux-kernel@...r.kernel.org, linux-sound@...r.kernel.org, 
 patches@...nsource.cirrus.com, 
 Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
Subject: [PATCH v2 3/3] spi: cadence-quadspi: Assume device could match via
 platform

Driver has only of_device_id table, however it also has MODULE_ALIAS()
for platform name, thus assume there is a configuration where this can
be loaded outside of OF system.  In such case of_device_get_match_data()
will return NULL, which is already checked in one place of probe()
function but not in the other, leading to Smatch warning:

  drivers/spi/spi-cadence-quadspi.c:1942 cqspi_probe() error: we previously assumed 'ddata' could be null (see line 1885)

Driver should be consistent, so assume device can be matched via
platform bus and of_device_get_match_data() can indeed return NULL.
This is also possible with malformed DTS on OF-platform: no unit address
and device node name matching driver name.

Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
---
 drivers/spi/spi-cadence-quadspi.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/spi/spi-cadence-quadspi.c b/drivers/spi/spi-cadence-quadspi.c
index c90462783b3f9f05e477d337ab4187224992c0a0..fe0f122f07b0206e80cf89bd031106bf8051c789 100644
--- a/drivers/spi/spi-cadence-quadspi.c
+++ b/drivers/spi/spi-cadence-quadspi.c
@@ -1949,7 +1949,7 @@ static int cqspi_probe(struct platform_device *pdev)
 
 	host->num_chipselect = cqspi->num_chipselect;
 
-	if (ddata->quirks & CQSPI_SUPPORT_DEVICE_RESET)
+	if (ddata && (ddata->quirks & CQSPI_SUPPORT_DEVICE_RESET))
 		cqspi_device_reset(cqspi);
 
 	if (cqspi->use_direct_mode) {

-- 
2.45.2