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![Julia Lawall](/assets/img/avatar_default.png)
Convert a possibly 0 error return code to a negative one, as returned elsewhere in the function. A simplified version of the semantic match that finds this problem is as follows: (http://coccinelle.lip6.fr/) // <smpl> @@ identifier ret; expression e,e1,e2,e3,e4,x; @@ ( if (\(ret != 0\|ret < 0\) || ...) { ... return ...; } | ret = 0 ) ... when != ret = e1 *x = \(kmalloc\|kzalloc\|kcalloc\|devm_kzalloc\|ioremap\|ioremap_nocache\|devm_ioremap\|devm_ioremap_nocache\)(...); ... when != x = e2 when != ret = e3 *if (x == NULL || ...) { ... when != ret = e4 * return ret; } // </smpl> Signed-off-by: Julia Lawall <Julia.Lawall@lip6.fr> Acked-by: Alan Stern <stern@rowland.harvard.edu> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
235 lines
5.4 KiB
C
235 lines
5.4 KiB
C
/*
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* Generic platform ehci driver
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*
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* Copyright 2007 Steven Brown <sbrown@cortland.com>
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* Copyright 2010-2012 Hauke Mehrtens <hauke@hauke-m.de>
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*
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* Derived from the ohci-ssb driver
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* Copyright 2007 Michael Buesch <m@bues.ch>
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*
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* Derived from the EHCI-PCI driver
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* Copyright (c) 2000-2004 by David Brownell
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*
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* Derived from the ohci-pci driver
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* Copyright 1999 Roman Weissgaerber
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* Copyright 2000-2002 David Brownell
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* Copyright 1999 Linus Torvalds
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* Copyright 1999 Gregory P. Smith
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*
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* Licensed under the GNU/GPL. See COPYING for details.
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*/
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#include <linux/platform_device.h>
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#include <linux/usb/ehci_pdriver.h>
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static int ehci_platform_reset(struct usb_hcd *hcd)
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{
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struct platform_device *pdev = to_platform_device(hcd->self.controller);
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struct usb_ehci_pdata *pdata = pdev->dev.platform_data;
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struct ehci_hcd *ehci = hcd_to_ehci(hcd);
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int retval;
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hcd->has_tt = pdata->has_tt;
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ehci->has_synopsys_hc_bug = pdata->has_synopsys_hc_bug;
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ehci->big_endian_desc = pdata->big_endian_desc;
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ehci->big_endian_mmio = pdata->big_endian_mmio;
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ehci->caps = hcd->regs + pdata->caps_offset;
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retval = ehci_setup(hcd);
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if (retval)
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return retval;
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if (pdata->port_power_on)
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ehci_port_power(ehci, 1);
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if (pdata->port_power_off)
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ehci_port_power(ehci, 0);
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return 0;
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}
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static const struct hc_driver ehci_platform_hc_driver = {
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.description = hcd_name,
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.product_desc = "Generic Platform EHCI Controller",
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.hcd_priv_size = sizeof(struct ehci_hcd),
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.irq = ehci_irq,
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.flags = HCD_MEMORY | HCD_USB2,
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.reset = ehci_platform_reset,
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.start = ehci_run,
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.stop = ehci_stop,
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.shutdown = ehci_shutdown,
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.urb_enqueue = ehci_urb_enqueue,
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.urb_dequeue = ehci_urb_dequeue,
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.endpoint_disable = ehci_endpoint_disable,
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.endpoint_reset = ehci_endpoint_reset,
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.get_frame_number = ehci_get_frame,
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.hub_status_data = ehci_hub_status_data,
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.hub_control = ehci_hub_control,
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#if defined(CONFIG_PM)
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.bus_suspend = ehci_bus_suspend,
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.bus_resume = ehci_bus_resume,
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#endif
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.relinquish_port = ehci_relinquish_port,
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.port_handed_over = ehci_port_handed_over,
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.clear_tt_buffer_complete = ehci_clear_tt_buffer_complete,
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};
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static int __devinit ehci_platform_probe(struct platform_device *dev)
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{
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struct usb_hcd *hcd;
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struct resource *res_mem;
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struct usb_ehci_pdata *pdata = dev->dev.platform_data;
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int irq;
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int err = -ENOMEM;
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if (!pdata) {
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WARN_ON(1);
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return -ENODEV;
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}
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if (usb_disabled())
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return -ENODEV;
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irq = platform_get_irq(dev, 0);
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if (irq < 0) {
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pr_err("no irq provided");
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return irq;
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}
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res_mem = platform_get_resource(dev, IORESOURCE_MEM, 0);
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if (!res_mem) {
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pr_err("no memory recourse provided");
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return -ENXIO;
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}
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if (pdata->power_on) {
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err = pdata->power_on(dev);
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if (err < 0)
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return err;
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}
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hcd = usb_create_hcd(&ehci_platform_hc_driver, &dev->dev,
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dev_name(&dev->dev));
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if (!hcd) {
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err = -ENOMEM;
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goto err_power;
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}
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hcd->rsrc_start = res_mem->start;
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hcd->rsrc_len = resource_size(res_mem);
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if (!request_mem_region(hcd->rsrc_start, hcd->rsrc_len, hcd_name)) {
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pr_err("controller already in use");
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err = -EBUSY;
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goto err_put_hcd;
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}
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hcd->regs = ioremap_nocache(hcd->rsrc_start, hcd->rsrc_len);
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if (!hcd->regs) {
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err = -ENOMEM;
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goto err_release_region;
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}
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err = usb_add_hcd(hcd, irq, IRQF_SHARED);
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if (err)
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goto err_iounmap;
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platform_set_drvdata(dev, hcd);
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return err;
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err_iounmap:
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iounmap(hcd->regs);
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err_release_region:
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release_mem_region(hcd->rsrc_start, hcd->rsrc_len);
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err_put_hcd:
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usb_put_hcd(hcd);
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err_power:
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if (pdata->power_off)
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pdata->power_off(dev);
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return err;
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}
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static int __devexit ehci_platform_remove(struct platform_device *dev)
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{
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struct usb_hcd *hcd = platform_get_drvdata(dev);
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struct usb_ehci_pdata *pdata = dev->dev.platform_data;
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usb_remove_hcd(hcd);
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iounmap(hcd->regs);
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release_mem_region(hcd->rsrc_start, hcd->rsrc_len);
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usb_put_hcd(hcd);
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platform_set_drvdata(dev, NULL);
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if (pdata->power_off)
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pdata->power_off(dev);
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return 0;
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}
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#ifdef CONFIG_PM
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static int ehci_platform_suspend(struct device *dev)
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{
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struct usb_hcd *hcd = dev_get_drvdata(dev);
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struct usb_ehci_pdata *pdata = dev->platform_data;
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struct platform_device *pdev =
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container_of(dev, struct platform_device, dev);
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bool do_wakeup = device_may_wakeup(dev);
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int ret;
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ret = ehci_suspend(hcd, do_wakeup);
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if (pdata->power_suspend)
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pdata->power_suspend(pdev);
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return ret;
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}
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static int ehci_platform_resume(struct device *dev)
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{
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struct usb_hcd *hcd = dev_get_drvdata(dev);
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struct usb_ehci_pdata *pdata = dev->platform_data;
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struct platform_device *pdev =
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container_of(dev, struct platform_device, dev);
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if (pdata->power_on) {
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int err = pdata->power_on(pdev);
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if (err < 0)
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return err;
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}
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ehci_resume(hcd, false);
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return 0;
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}
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#else /* !CONFIG_PM */
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#define ehci_platform_suspend NULL
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#define ehci_platform_resume NULL
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#endif /* CONFIG_PM */
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static const struct platform_device_id ehci_platform_table[] = {
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{ "ehci-platform", 0 },
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{ }
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};
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MODULE_DEVICE_TABLE(platform, ehci_platform_table);
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static const struct dev_pm_ops ehci_platform_pm_ops = {
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.suspend = ehci_platform_suspend,
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.resume = ehci_platform_resume,
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};
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static struct platform_driver ehci_platform_driver = {
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.id_table = ehci_platform_table,
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.probe = ehci_platform_probe,
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.remove = __devexit_p(ehci_platform_remove),
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.shutdown = usb_hcd_platform_shutdown,
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.driver = {
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.owner = THIS_MODULE,
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.name = "ehci-platform",
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.pm = &ehci_platform_pm_ops,
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}
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};
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