spi: mediatek: Enable irq before the spi registration

[ Upstream commit b24cded ]

If the irq is enabled after the spi si registered, there can be a race
with the initialization of the devices on the spi bus.

Eg:
mtk-spi 1100a000.spi: spi-mem transfer timeout
spi-nor: probe of spi0.0 failed with error -110
Unable to handle kernel NULL pointer dereference at virtual address
0000000000000010
...
Call trace:
 mtk_spi_can_dma+0x0/0x2c

Fixes: c6f7874 ("spi: mediatek: Enable irq when pdata is ready")
Reported-by: Daniel Golle <daniel@makrotopia.org>
Signed-off-by: Ricardo Ribalda <ribalda@chromium.org>
Tested-by: Daniel Golle <daniel@makrotopia.org>
Link: https://lore.kernel.org/r/20221225-mtk-spi-fixes-v1-0-bb6c14c232f8@chromium.org
Signed-off-by: Mark Brown <broonie@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>

drivers/spi/spi-mt65xx.c

@@ -1253,6 +1253,11 @@ static int mtk_spi_probe(struct platform_device *pdev)
 		dev_notice(dev, "SPI dma_set_mask(%d) failed, ret:%d\n",
 			   addr_bits, ret);
 
+	ret = devm_request_irq(dev, irq, mtk_spi_interrupt,
+			       IRQF_TRIGGER_NONE, dev_name(dev), master);
+	if (ret)
+		return dev_err_probe(dev, ret, "failed to register irq\n");
+
 	pm_runtime_enable(dev);
 
 	ret = devm_spi_register_master(dev, master);
@@ -1261,13 +1266,6 @@ static int mtk_spi_probe(struct platform_device *pdev)
 		return dev_err_probe(dev, ret, "failed to register master\n");
 	}
 
-	ret = devm_request_irq(dev, irq, mtk_spi_interrupt,
-			       IRQF_TRIGGER_NONE, dev_name(dev), master);
-	if (ret) {
-		pm_runtime_disable(dev);
-		return dev_err_probe(dev, ret, "failed to register irq\n");
-	}
-
 	return 0;
 }