linux-kernel - [PATCH] spi: mediatek: Enable irq when pdata is ready

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Message-Id: <20221128-spi-mt65xx-v1-0-509266830665@chromium.org>
Date:   Mon, 28 Nov 2022 12:00:01 +0100
From:   Ricardo Ribalda <ribalda@...omium.org>
To:     Mark Brown <broonie@...nel.org>,
        Matthias Brugger <matthias.bgg@...il.com>
Cc:     Ricardo Ribalda <ribalda@...omium.org>,
        linux-arm-kernel@...ts.infradead.org,
        linux-mediatek@...ts.infradead.org, linux-spi@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: [PATCH] spi: mediatek: Enable irq when pdata is ready

If the device does not come straight from reset, we might receive an IRQ
before we are ready to handle it.

Fixes:

[    0.832328] Unable to handle kernel read from unreadable memory at virtual address 0000000000000010
[    1.040343] Call trace:
[    1.040347]  mtk_spi_can_dma+0xc/0x40
...
[    1.262265]  start_kernel+0x338/0x42c

Signed-off-by: Ricardo Ribalda <ribalda@...omium.org>
---
To: Mark Brown <broonie@...nel.org>
To: Matthias Brugger <matthias.bgg@...il.com>
Cc: linux-spi@...r.kernel.org
Cc: linux-arm-kernel@...ts.infradead.org
Cc: linux-mediatek@...ts.infradead.org
Cc: linux-kernel@...r.kernel.org
---
 drivers/spi/spi-mt65xx.c | 12 +++++++-----
 1 file changed, 7 insertions(+), 5 deletions(-)

diff --git a/drivers/spi/spi-mt65xx.c b/drivers/spi/spi-mt65xx.c
index d6aff909fc36..6de8360e5c2a 100644
--- a/drivers/spi/spi-mt65xx.c
+++ b/drivers/spi/spi-mt65xx.c
@@ -1192,11 +1192,6 @@ static int mtk_spi_probe(struct platform_device *pdev)
 	else
 		dma_set_max_seg_size(dev, SZ_256K);
 
-	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");
-
 	mdata->parent_clk = devm_clk_get(dev, "parent-clk");
 	if (IS_ERR(mdata->parent_clk))
 		return dev_err_probe(dev, PTR_ERR(mdata->parent_clk),
@@ -1266,6 +1261,13 @@ 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;
 }
 

---
base-commit: 4312098baf37ee17a8350725e6e0d0e8590252d4
change-id: 20221128-spi-mt65xx-b92c9ca96ffa

Best regards,
-- 
Ricardo Ribalda <ribalda@...omium.org>