[PATCH] spi: bcm2835: Do not call gpiod_put() on invalid descriptor

[Florian Fainelli]

If we are unable to lookup the chip-select GPIO, the error path will
call bcm2835_spi_cleanup() which unconditionally calls gpiod_put() on
the cs->gpio variable which we just determined was invalid.

Fixes: 21f252cd29f0 ("spi: bcm2835: reduce the abuse of the GPIO API")
Signed-off-by: Florian Fainelli <florian.fainelli@xxxxxxxxxxxx>
---
 drivers/spi/spi-bcm2835.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/spi/spi-bcm2835.c b/drivers/spi/spi-bcm2835.c
index e1b9b1235787..a5d621b94d5e 100644
--- a/drivers/spi/spi-bcm2835.c
+++ b/drivers/spi/spi-bcm2835.c
@@ -1162,7 +1162,8 @@ static void bcm2835_spi_cleanup(struct spi_device *spi)
 				 sizeof(u32),
 				 DMA_TO_DEVICE);
 
-	gpiod_put(bs->cs_gpio);
+	if (!IS_ERR(bs->cs_gpio))
+		gpiod_put(bs->cs_gpio);
 	spi_set_csgpiod(spi, 0, NULL);
 
 	kfree(target);
-- 
2.34.1