[PATCH v2 5/5] spi: nxp-fspi: use devm instead of remove for driver detach

[Haibo Chen]

From: Han Xu <han.xu@xxxxxxx>

fspi driver use devm APIs to manage clk/irq/resources and register the spi
controller, but the legacy remove function will be called first during
device detach and trigger kernel panic. Drop the remove function and use
devm_add_action_or_reset() for driver cleanup to ensure the release
sequence.

Signed-off-by: Han Xu <han.xu@xxxxxxx>
Signed-off-by: Haibo Chen <haibo.chen@xxxxxxx>
---
 drivers/spi/spi-nxp-fspi.c | 41 ++++++++++++++++++++++-------------------
 1 file changed, 22 insertions(+), 19 deletions(-)

diff --git a/drivers/spi/spi-nxp-fspi.c b/drivers/spi/spi-nxp-fspi.c
index 5be7809b4a494e22ac79c07b99cfe8b2fa430ebe..15dc32b7a830079764520df10a143af1f2feeb43 100644
--- a/drivers/spi/spi-nxp-fspi.c
+++ b/drivers/spi/spi-nxp-fspi.c
@@ -1168,6 +1168,24 @@ static const struct spi_controller_mem_caps nxp_fspi_mem_caps = {
 	.per_op_freq = true,
 };
 
+static void nxp_fspi_cleanup(void *data)
+{
+	struct nxp_fspi *f = data;
+
+	/* enable clock first since there is reigster access */
+	pm_runtime_get_sync(f->dev);
+
+	/* disable the hardware */
+	fspi_writel(f, FSPI_MCR0_MDIS, f->iobase + FSPI_MCR0);
+
+	pm_runtime_disable(f->dev);
+	pm_runtime_put_noidle(f->dev);
+	nxp_fspi_clk_disable_unprep(f);
+
+	if (f->ahb_addr)
+		iounmap(f->ahb_addr);
+}
+
 static int nxp_fspi_probe(struct platform_device *pdev)
 {
 	struct spi_controller *ctlr;
@@ -1263,25 +1281,11 @@ static int nxp_fspi_probe(struct platform_device *pdev)
 	ctlr->mem_caps = &nxp_fspi_mem_caps;
 	ctlr->dev.of_node = np;
 
-	return devm_spi_register_controller(&pdev->dev, ctlr);
-}
-
-static void nxp_fspi_remove(struct platform_device *pdev)
-{
-	struct nxp_fspi *f = platform_get_drvdata(pdev);
-
-	/* enable clock first since there is reigster access */
-	pm_runtime_get_sync(f->dev);
-
-	/* disable the hardware */
-	fspi_writel(f, FSPI_MCR0_MDIS, f->iobase + FSPI_MCR0);
-
-	pm_runtime_disable(f->dev);
-	pm_runtime_put_noidle(f->dev);
-	nxp_fspi_clk_disable_unprep(f);
+	ret = devm_add_action_or_reset(dev, nxp_fspi_cleanup, f);
+	if (ret)
+		return dev_err_probe(dev, ret, "Failed to register nxp_fspi_cleanup\n");
 
-	if (f->ahb_addr)
-		iounmap(f->ahb_addr);
+	return devm_spi_register_controller(&pdev->dev, ctlr);
 }
 
 #ifdef CONFIG_PM
@@ -1365,7 +1369,6 @@ static struct platform_driver nxp_fspi_driver = {
 		.pm =   &nxp_fspi_pm_ops,
 	},
 	.probe          = nxp_fspi_probe,
-	.remove		= nxp_fspi_remove,
 };
 module_platform_driver(nxp_fspi_driver);
 

-- 
2.34.1