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a28dbea0ad
When the cell data_size is 0, the resulting platform_data pointer will be set to ZERO_SIZE_PTR. That could be misleading for device drivers running a NULL check on thei platform_data pointer before dereferencing it. Signed-off-by: Brian Harring <ferringb@gmail.com> Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>
133 lines
2.9 KiB
C
133 lines
2.9 KiB
C
/*
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* drivers/mfd/mfd-core.c
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*
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* core MFD support
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* Copyright (c) 2006 Ian Molton
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* Copyright (c) 2007,2008 Dmitry Baryshkov
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*
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*/
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#include <linux/kernel.h>
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#include <linux/platform_device.h>
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#include <linux/acpi.h>
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#include <linux/mfd/core.h>
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#include <linux/slab.h>
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static int mfd_add_device(struct device *parent, int id,
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const struct mfd_cell *cell,
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struct resource *mem_base,
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int irq_base)
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{
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struct resource *res;
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struct platform_device *pdev;
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int ret = -ENOMEM;
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int r;
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pdev = platform_device_alloc(cell->name, id + cell->id);
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if (!pdev)
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goto fail_alloc;
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res = kzalloc(sizeof(*res) * cell->num_resources, GFP_KERNEL);
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if (!res)
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goto fail_device;
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pdev->dev.parent = parent;
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platform_set_drvdata(pdev, cell->driver_data);
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if (cell->data_size) {
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ret = platform_device_add_data(pdev,
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cell->platform_data, cell->data_size);
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if (ret)
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goto fail_res;
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}
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for (r = 0; r < cell->num_resources; r++) {
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res[r].name = cell->resources[r].name;
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res[r].flags = cell->resources[r].flags;
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/* Find out base to use */
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if ((cell->resources[r].flags & IORESOURCE_MEM) && mem_base) {
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res[r].parent = mem_base;
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res[r].start = mem_base->start +
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cell->resources[r].start;
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res[r].end = mem_base->start +
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cell->resources[r].end;
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} else if (cell->resources[r].flags & IORESOURCE_IRQ) {
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res[r].start = irq_base +
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cell->resources[r].start;
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res[r].end = irq_base +
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cell->resources[r].end;
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} else {
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res[r].parent = cell->resources[r].parent;
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res[r].start = cell->resources[r].start;
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res[r].end = cell->resources[r].end;
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}
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if (!cell->ignore_resource_conflicts) {
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ret = acpi_check_resource_conflict(res);
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if (ret)
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goto fail_res;
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}
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}
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ret = platform_device_add_resources(pdev, res, cell->num_resources);
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if (ret)
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goto fail_res;
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ret = platform_device_add(pdev);
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if (ret)
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goto fail_res;
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kfree(res);
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return 0;
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/* platform_device_del(pdev); */
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fail_res:
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kfree(res);
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fail_device:
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platform_device_put(pdev);
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fail_alloc:
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return ret;
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}
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int mfd_add_devices(struct device *parent, int id,
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const struct mfd_cell *cells, int n_devs,
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struct resource *mem_base,
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int irq_base)
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{
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int i;
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int ret = 0;
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for (i = 0; i < n_devs; i++) {
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ret = mfd_add_device(parent, id, cells + i, mem_base, irq_base);
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if (ret)
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break;
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}
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if (ret)
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mfd_remove_devices(parent);
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return ret;
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}
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EXPORT_SYMBOL(mfd_add_devices);
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static int mfd_remove_devices_fn(struct device *dev, void *unused)
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{
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platform_device_unregister(to_platform_device(dev));
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return 0;
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}
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void mfd_remove_devices(struct device *parent)
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{
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device_for_each_child(parent, NULL, mfd_remove_devices_fn);
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}
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EXPORT_SYMBOL(mfd_remove_devices);
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MODULE_LICENSE("GPL");
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MODULE_AUTHOR("Ian Molton, Dmitry Baryshkov");
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