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authorWill Newton <will.newton@gmail.com>2008-08-12 15:39:17 +0100
committerGreg Kroah-Hartman <gregkh@suse.de>2008-10-17 14:41:07 -0700
commit23d7cd040e1f43113da3e8763becf576ab86b39a (patch)
treed4f98257a6a379dfcf53d814aef79cdebe1cd340 /drivers/usb
parent59097fb73cf60276053551308524f6c772f305a9 (diff)
downloadblackbird-op-linux-23d7cd040e1f43113da3e8763becf576ab86b39a.tar.gz
blackbird-op-linux-23d7cd040e1f43113da3e8763becf576ab86b39a.zip
fsl_usb2_udc: Fix oops on probe failure.
In some circumstances when fsl_udc_probe fails udc_controller is freed but the pointer remains non-NULL. fsl_udc_remove will then try and teardown the partly initialized and freed controller structure resulting in an oops. This patch ensures udc_controller is either NULL or fully initialized after fsl_udc_probe. Signed-off-by: Will Newton <will.newton@gmail.com> Acked-by: Li Yang <leoli@freescale.com> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
Diffstat (limited to 'drivers/usb')
-rw-r--r--drivers/usb/gadget/fsl_usb2_udc.c32
1 files changed, 17 insertions, 15 deletions
diff --git a/drivers/usb/gadget/fsl_usb2_udc.c b/drivers/usb/gadget/fsl_usb2_udc.c
index 0492441bc0ba..091bb55c9aa7 100644
--- a/drivers/usb/gadget/fsl_usb2_udc.c
+++ b/drivers/usb/gadget/fsl_usb2_udc.c
@@ -2244,21 +2244,21 @@ static int __init fsl_udc_probe(struct platform_device *pdev)
res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
if (!res) {
- kfree(udc_controller);
- return -ENXIO;
+ ret = -ENXIO;
+ goto err_kfree;
}
if (!request_mem_region(res->start, res->end - res->start + 1,
driver_name)) {
ERR("request mem region for %s failed\n", pdev->name);
- kfree(udc_controller);
- return -EBUSY;
+ ret = -EBUSY;
+ goto err_kfree;
}
dr_regs = ioremap(res->start, res->end - res->start + 1);
if (!dr_regs) {
ret = -ENOMEM;
- goto err1;
+ goto err_release_mem_region;
}
usb_sys_regs = (struct usb_sys_interface *)
@@ -2269,7 +2269,7 @@ static int __init fsl_udc_probe(struct platform_device *pdev)
if (!(dccparams & DCCPARAMS_DC)) {
ERR("This SOC doesn't support device role\n");
ret = -ENODEV;
- goto err2;
+ goto err_iounmap;
}
/* Get max device endpoints */
/* DEN is bidirectional ep number, max_ep doubles the number */
@@ -2278,7 +2278,7 @@ static int __init fsl_udc_probe(struct platform_device *pdev)
udc_controller->irq = platform_get_irq(pdev, 0);
if (!udc_controller->irq) {
ret = -ENODEV;
- goto err2;
+ goto err_iounmap;
}
ret = request_irq(udc_controller->irq, fsl_udc_irq, IRQF_SHARED,
@@ -2286,14 +2286,14 @@ static int __init fsl_udc_probe(struct platform_device *pdev)
if (ret != 0) {
ERR("cannot request irq %d err %d\n",
udc_controller->irq, ret);
- goto err2;
+ goto err_iounmap;
}
/* Initialize the udc structure including QH member and other member */
if (struct_udc_setup(udc_controller, pdev)) {
ERR("Can't initialize udc data structure\n");
ret = -ENOMEM;
- goto err3;
+ goto err_free_irq;
}
/* initialize usb hw reg except for regs for EP,
@@ -2314,7 +2314,7 @@ static int __init fsl_udc_probe(struct platform_device *pdev)
udc_controller->gadget.dev.parent = &pdev->dev;
ret = device_register(&udc_controller->gadget.dev);
if (ret < 0)
- goto err3;
+ goto err_free_irq;
/* setup QH and epctrl for ep0 */
ep0_setup(udc_controller);
@@ -2344,20 +2344,22 @@ static int __init fsl_udc_probe(struct platform_device *pdev)
DTD_ALIGNMENT, UDC_DMA_BOUNDARY);
if (udc_controller->td_pool == NULL) {
ret = -ENOMEM;
- goto err4;
+ goto err_unregister;
}
create_proc_file();
return 0;
-err4:
+err_unregister:
device_unregister(&udc_controller->gadget.dev);
-err3:
+err_free_irq:
free_irq(udc_controller->irq, udc_controller);
-err2:
+err_iounmap:
iounmap(dr_regs);
-err1:
+err_release_mem_region:
release_mem_region(res->start, res->end - res->start + 1);
+err_kfree:
kfree(udc_controller);
+ udc_controller = NULL;
return ret;
}
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