spi: pxa2xx: Do not override dev->platform_data on probe

The platform_data field may be supplied by legacy board code.
In other cases we override it, and module remove and probe cycle
will crash the kernel since it will carry a stale pointer.

Fix this by supplying a third argument to the pxa2xx_spi_probe()
and avoid overriding dev->platform_data.

Reported-by: Hao Ma <[email protected]>
Fixes: cc16069 ("spi: pxa2xx: Convert PCI driver to use spi-pxa2xx code directly")
Fixes: 3d8f037 ("spi: pxa2xx: Move platform driver to a separate file")
Fixes: 20ade9b ("spi: pxa2xx: Extract pxa2xx_spi_platform_*() callbacks")
Signed-off-by: Andy Shevchenko <[email protected]>
Link: https://patch.msgid.link/[email protected]
Signed-off-by: Mark Brown <[email protected]>

Author: andy-shev

drivers/spi/spi-pxa2xx-pci.c

@@ -297,7 +297,7 @@ static int pxa2xx_spi_pci_probe(struct pci_dev *dev,
 		return ret;
 	ssp->irq = pci_irq_vector(dev, 0);
 
-	return pxa2xx_spi_probe(&dev->dev, ssp);
+	return pxa2xx_spi_probe(&dev->dev, ssp, pdata);
 }
 
 static void pxa2xx_spi_pci_remove(struct pci_dev *dev)

drivers/spi/spi-pxa2xx-platform.c

@@ -63,7 +63,7 @@ static struct ssp_device *pxa2xx_spi_ssp_request(struct platform_device *pdev)
 
 	ssp = pxa_ssp_request(pdev->id, pdev->name);
 	if (!ssp)
-		return ssp;
+		return NULL;
 
 	status = devm_add_action_or_reset(&pdev->dev, pxa2xx_spi_ssp_release, ssp);
 	if (status)
@@ -148,8 +148,6 @@ static int pxa2xx_spi_platform_probe(struct platform_device *pdev)
 		platform_info = pxa2xx_spi_init_pdata(pdev);
 		if (IS_ERR(platform_info))
 			return dev_err_probe(dev, PTR_ERR(platform_info), "missing platform data\n");
-
-		dev->platform_data = platform_info;
 	}
 
 	ssp = pxa2xx_spi_ssp_request(pdev);
@@ -158,7 +156,7 @@ static int pxa2xx_spi_platform_probe(struct platform_device *pdev)
 	if (!ssp)
 		ssp = &platform_info->ssp;
 
-	return pxa2xx_spi_probe(dev, ssp);
+	return pxa2xx_spi_probe(dev, ssp, platform_info);
 }
 
 static void pxa2xx_spi_platform_remove(struct platform_device *pdev)

drivers/spi/spi-pxa2xx.c

@@ -1277,16 +1277,15 @@ static size_t pxa2xx_spi_max_dma_transfer_size(struct spi_device *spi)
 	return MAX_DMA_LEN;
 }
 
-int pxa2xx_spi_probe(struct device *dev, struct ssp_device *ssp)
+int pxa2xx_spi_probe(struct device *dev, struct ssp_device *ssp,
+		     struct pxa2xx_spi_controller *platform_info)
 {
-	struct pxa2xx_spi_controller *platform_info;
 	struct spi_controller *controller;
 	struct driver_data *drv_data;
 	const struct lpss_config *config;
 	int status;
 	u32 tmp;
 
-	platform_info = dev_get_platdata(dev);
 	if (platform_info->is_target)
 		controller = devm_spi_alloc_target(dev, sizeof(*drv_data));
 	else

drivers/spi/spi-pxa2xx.h

@@ -132,7 +132,8 @@ extern void pxa2xx_spi_dma_stop(struct driver_data *drv_data);
 extern int pxa2xx_spi_dma_setup(struct driver_data *drv_data);
 extern void pxa2xx_spi_dma_release(struct driver_data *drv_data);
 
-int pxa2xx_spi_probe(struct device *dev, struct ssp_device *ssp);
+int pxa2xx_spi_probe(struct device *dev, struct ssp_device *ssp,
+		     struct pxa2xx_spi_controller *platform_info);
 void pxa2xx_spi_remove(struct device *dev);
 
 extern const struct dev_pm_ops pxa2xx_spi_pm_ops;