From: Ricardo Ribalda <ribalda@xxxxxxxxxxxx>
[ Upstream commit b24cded8c065d7cef8690b2c7b82b828cce57708 ]
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: c6f7874687f7 ("spi: mediatek: Enable irq when pdata is ready")
Reported-by: Daniel Golle <daniel@xxxxxxxxxxxxxx>
Signed-off-by: Ricardo Ribalda <ribalda@xxxxxxxxxxxx>
Tested-by: Daniel Golle <daniel@xxxxxxxxxxxxxx>
Link: https://lore.kernel.org/r/20221225-mtk-spi-fixes-v1-0-bb6c14c232f8@xxxxxxxxxxxx
Signed-off-by: Mark Brown <broonie@xxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
---
drivers/spi/spi-mt65xx.c | 12 +++++-------
1 file changed, 5 insertions(+), 7 deletions(-)
diff --git a/drivers/spi/spi-mt65xx.c b/drivers/spi/spi-mt65xx.c
index 6de8360e5c2a9..9eab6c20dbc56 100644
--- a/drivers/spi/spi-mt65xx.c
+++ b/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;
}
--
2.39.0
