dcdbas was explicitly initializing DMA masks thusly: dcdbas_pdev->dev.coherent_dma_mask = DMA_BIT_MASK(32); dcdbas_pdev->dev.dma_mask = &dcdbas_pdev->dev.coherent_dma_mask; which bypasses the architecture check. Moreover, it is creating the dcdbas_pdev device itself, and using the platform_device_register_full() avoids some of this explicit initialization.
Convert the driver to use platform_device_register_full(), and as it makes use of coherent DMA, also call dma_set_coherent_mask() to ensure that the architecture gets to check the mask.
Signed-off-by: Russell King rmk+kernel@arm.linux.org.uk --- drivers/firmware/dcdbas.c | 23 ++++++++++++----------- 1 files changed, 12 insertions(+), 11 deletions(-)
diff --git a/drivers/firmware/dcdbas.c b/drivers/firmware/dcdbas.c index ff080ee..a85fda2 100644 --- a/drivers/firmware/dcdbas.c +++ b/drivers/firmware/dcdbas.c @@ -549,8 +549,9 @@ static int dcdbas_probe(struct platform_device *dev) * BIOS SMI calls require buffer addresses be in 32-bit address space. * This is done by setting the DMA mask below. */ - dcdbas_pdev->dev.coherent_dma_mask = DMA_BIT_MASK(32); - dcdbas_pdev->dev.dma_mask = &dcdbas_pdev->dev.coherent_dma_mask; + error = dma_set_coherent_mask(&dcdbas_pdev->dev, DMA_BIT_MASK(32)); + if (error) + return error;
error = sysfs_create_group(&dev->dev.kobj, &dcdbas_attr_group); if (error) @@ -581,6 +582,12 @@ static struct platform_driver dcdbas_driver = { .remove = dcdbas_remove, };
+static const struct platform_device_info dcdbas_dev_info __initdata = { + .name = DRIVER_NAME, + .id = -1, + .dma_mask = DMA_BIT_MASK(32), +}; + /** * dcdbas_init: initialize driver */ @@ -592,20 +599,14 @@ static int __init dcdbas_init(void) if (error) return error;
- dcdbas_pdev = platform_device_alloc(DRIVER_NAME, -1); - if (!dcdbas_pdev) { - error = -ENOMEM; + dcdbas_pdev = platform_device_register_full(&dcdbas_dev_info); + if (IS_ERR(dcdbas_pdev)) { + error = PTR_ERR(dcdbas_pdev); goto err_unregister_driver; }
- error = platform_device_add(dcdbas_pdev); - if (error) - goto err_free_device; - return 0;
- err_free_device: - platform_device_put(dcdbas_pdev); err_unregister_driver: platform_driver_unregister(&dcdbas_driver); return error;