USB: Properly unregister reboot notifier in case of failure in ehci hcd

If some problem occurs during ehci startup, for instance, request_irq fails,
echi hcd driver tries it best to cleanup, but fails to unregister reboot
notifier, which in turn leads to crash on reboot/poweroff.

The following patch resolves this problem by not using reboot notifiers
anymore, but instead making ehci/ohci driver get its own shutdown method.  For
PCI, it is done through pci glue, for everything else through platform driver
glue.

One downside: sa1111 does not use platform driver stuff, and does not have its
own shutdown hook, so no 'shutdown' is called for it now.  I'm not sure if it
is really necessary on that platform, though.

Signed-off-by: Aleks Gorelov <dared1st@yahoo.com>
Cc: Alan Stern <stern@rowland.harvard.edu>
Cc: David Brownell <david-b@pacbell.net>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

20 files changed, 69 insertions, 23 deletions

diff --git a/drivers/usb/core/hcd-pci.c b/drivers/usb/core/hcd-pci.c
index fa36391..edf4300 100644
--- a/drivers/usb/core/hcd-pci.c
+++ b/drivers/usb/core/hcd-pci.c
@@ -413,4 +413,20 @@ EXPORT_SYMBOL (usb_hcd_pci_resume);
 
 #endif	/* CONFIG_PM */
 
+/**
+ * usb_hcd_pci_shutdown - shutdown host controller
+ * @dev: USB Host Controller being shutdown
+ */
+void usb_hcd_pci_shutdown (struct pci_dev *dev)
+{
+	struct usb_hcd		*hcd;
+
+	hcd = pci_get_drvdata(dev);
+	if (!hcd)
+		return;
+
+	if (hcd->driver->shutdown)
+		hcd->driver->shutdown(hcd);
+}
+EXPORT_SYMBOL (usb_hcd_pci_shutdown);
 
diff --git a/drivers/usb/core/hcd.c b/drivers/usb/core/hcd.c
index fb4d058..dc9628c 100644
--- a/drivers/usb/core/hcd.c
+++ b/drivers/usb/core/hcd.c
@@ -36,6 +36,7 @@
 #include <linux/mutex.h>
 #include <asm/irq.h>
 #include <asm/byteorder.h>
+#include <linux/platform_device.h>
 
 #include <linux/usb.h>
 
@@ -1915,6 +1916,16 @@ void usb_remove_hcd(struct usb_hcd *hcd)
 }
 EXPORT_SYMBOL (usb_remove_hcd);
 
+void
+usb_hcd_platform_shutdown(struct platform_device* dev)
+{
+	struct usb_hcd *hcd = platform_get_drvdata(dev);
+
+	if (hcd->driver->shutdown)
+		hcd->driver->shutdown(hcd);
+}
+EXPORT_SYMBOL (usb_hcd_platform_shutdown);
+
 /*-------------------------------------------------------------------------*/
 
 #if defined(CONFIG_USB_MON)
diff --git a/drivers/usb/core/hcd.h b/drivers/usb/core/hcd.h
index 7022aaf..58c7767 100644
--- a/drivers/usb/core/hcd.h
+++ b/drivers/usb/core/hcd.h
@@ -192,6 +192,9 @@ struct hc_driver {
 	/* cleanly make HCD stop writing memory and doing I/O */
 	void	(*stop) (struct usb_hcd *hcd);
 
+	/* shutdown HCD */
+	void	(*shutdown) (struct usb_hcd *hcd);
+
 	/* return current frame number */
 	int	(*get_frame_number) (struct usb_hcd *hcd);
 
@@ -227,6 +230,9 @@ extern int usb_add_hcd(struct usb_hcd *hcd,
 		unsigned int irqnum, unsigned long irqflags);
 extern void usb_remove_hcd(struct usb_hcd *hcd);
 
+struct platform_device;
+extern void usb_hcd_platform_shutdown(struct platform_device* dev);
+
 #ifdef CONFIG_PCI
 struct pci_dev;
 struct pci_device_id;
@@ -239,6 +245,8 @@ extern int usb_hcd_pci_suspend (struct pci_dev *dev, pm_message_t state);
 extern int usb_hcd_pci_resume (struct pci_dev *dev);
 #endif /* CONFIG_PM */
 
+extern void usb_hcd_pci_shutdown (struct pci_dev *dev);
+
 #endif /* CONFIG_PCI */
 
 /* pci-ish (pdev null is ok) buffer alloc/mapping support */
diff --git a/drivers/usb/host/ehci-au1xxx.c b/drivers/usb/host/ehci-au1xxx.c
index 26ed757..5d1b12a 100644
--- a/drivers/usb/host/ehci-au1xxx.c
+++ b/drivers/usb/host/ehci-au1xxx.c
@@ -200,6 +200,7 @@ static const struct hc_driver ehci_au1xxx_hc_driver = {
 	.reset = ehci_init,
 	.start = ehci_run,
 	.stop = ehci_stop,
+	.shutdown = ehci_shutdown,
 
 	/*
 	 * managing i/o requests and associated device resources
@@ -268,6 +269,7 @@ MODULE_ALIAS("au1xxx-ehci");
 static struct platform_driver ehci_hcd_au1xxx_driver = {
 	.probe = ehci_hcd_au1xxx_drv_probe,
 	.remove = ehci_hcd_au1xxx_drv_remove,
+	.shutdown = usb_hcd_platform_shutdown,
 	/*.suspend      = ehci_hcd_au1xxx_drv_suspend, */
 	/*.resume       = ehci_hcd_au1xxx_drv_resume, */
 	.driver = {
diff --git a/drivers/usb/host/ehci-fsl.c b/drivers/usb/host/ehci-fsl.c
index d030516..1a915e9 100644
--- a/drivers/usb/host/ehci-fsl.c
+++ b/drivers/usb/host/ehci-fsl.c
@@ -285,6 +285,7 @@ static const struct hc_driver ehci_fsl_hc_driver = {
 	.resume = ehci_bus_resume,
 #endif
 	.stop = ehci_stop,
+	.shutdown = ehci_shutdown,
 
 	/*
 	 * managing i/o requests and associated device resources
@@ -329,6 +330,7 @@ MODULE_ALIAS("fsl-ehci");
 static struct platform_driver ehci_fsl_driver = {
 	.probe = ehci_fsl_drv_probe,
 	.remove = ehci_fsl_drv_remove,
+	.shutdown = usb_hcd_platform_shutdown,
 	.driver = {
 		   .name = "fsl-ehci",
 		   },
diff --git a/drivers/usb/host/ehci-hcd.c b/drivers/usb/host/ehci-hcd.c
index d63177a..1c54b30 100644
--- a/drivers/usb/host/ehci-hcd.c
+++ b/drivers/usb/host/ehci-hcd.c
@@ -292,21 +292,20 @@ static void ehci_watchdog (unsigned long param)
 	spin_unlock_irqrestore (&ehci->lock, flags);
 }
 
-/* Reboot notifiers kick in for silicon on any bus (not just pci, etc).
+/* ehci_shutdown kick in for silicon on any bus (not just pci, etc).
  * This forcibly disables dma and IRQs, helping kexec and other cases
  * where the next system software may expect clean state.
  */
-static int
-ehci_reboot (struct notifier_block *self, unsigned long code, void *null)
+static void
+ehci_shutdown (struct usb_hcd *hcd)
 {
-	struct ehci_hcd		*ehci;
+	struct ehci_hcd	*ehci;
 
-	ehci = container_of (self, struct ehci_hcd, reboot_notifier);
+	ehci = hcd_to_ehci (hcd);
 	(void) ehci_halt (ehci);
 
 	/* make BIOS/etc use companion controller during reboot */
 	writel (0, &ehci->regs->configured_flag);
-	return 0;
 }
 
 static void ehci_port_power (struct ehci_hcd *ehci, int is_on)
@@ -381,7 +380,6 @@ static void ehci_stop (struct usb_hcd *hcd)
 
 	/* let companion controllers work when we aren't */
 	writel (0, &ehci->regs->configured_flag);
-	unregister_reboot_notifier (&ehci->reboot_notifier);
 
 	remove_debug_files (ehci);
 
@@ -483,9 +481,6 @@ static int ehci_init(struct usb_hcd *hcd)
 	}
 	ehci->command = temp;
 
-	ehci->reboot_notifier.notifier_call = ehci_reboot;
-	register_reboot_notifier(&ehci->reboot_notifier);
-
 	return 0;
 }
 
@@ -499,7 +494,6 @@ static int ehci_run (struct usb_hcd *hcd)
 
 	/* EHCI spec section 4.1 */
 	if ((retval = ehci_reset(ehci)) != 0) {
-		unregister_reboot_notifier(&ehci->reboot_notifier);
 		ehci_mem_cleanup(ehci);
 		return retval;
 	}
diff --git a/drivers/usb/host/ehci-pci.c b/drivers/usb/host/ehci-pci.c
index 6967ab7..e6a3bcd 100644
--- a/drivers/usb/host/ehci-pci.c
+++ b/drivers/usb/host/ehci-pci.c
@@ -338,6 +338,7 @@ static const struct hc_driver ehci_pci_hc_driver = {
 	.resume =		ehci_pci_resume,
 #endif
 	.stop =			ehci_stop,
+	.shutdown =		ehci_shutdown,
 
 	/*
 	 * managing i/o requests and associated device resources
@@ -384,4 +385,5 @@ static struct pci_driver ehci_pci_driver = {
 	.suspend =	usb_hcd_pci_suspend,
 	.resume =	usb_hcd_pci_resume,
 #endif
+	.shutdown = 	usb_hcd_pci_shutdown,
 };
diff --git a/drivers/usb/host/ehci.h b/drivers/usb/host/ehci.h
index 679c1cd..1385ce2 100644
--- a/drivers/usb/host/ehci.h
+++ b/drivers/usb/host/ehci.h
@@ -82,7 +82,6 @@ struct ehci_hcd {			/* one per controller */
 	struct dma_pool		*sitd_pool;	/* sitd per split iso urb */
 
 	struct timer_list	watchdog;
-	struct notifier_block	reboot_notifier;
 	unsigned long		actions;
 	unsigned		stamp;
 	unsigned long		next_statechange;
diff --git a/drivers/usb/host/ohci-at91.c b/drivers/usb/host/ohci-at91.c
index 33b7508..5a5bdf3 100644
--- a/drivers/usb/host/ohci-at91.c
+++ b/drivers/usb/host/ohci-at91.c
@@ -221,6 +221,7 @@ static const struct hc_driver ohci_at91_hc_driver = {
 	 */
 	.start =		ohci_at91_start,
 	.stop =			ohci_stop,
+	.shutdown = 		ohci_shutdown,
 
 	/*
 	 * managing i/o requests and associated device resources
@@ -310,6 +311,7 @@ MODULE_ALIAS("at91_ohci");
 static struct platform_driver ohci_hcd_at91_driver = {
 	.probe		= ohci_hcd_at91_drv_probe,
 	.remove		= ohci_hcd_at91_drv_remove,
+	.shutdown	= usb_hcd_platform_shutdown,
 	.suspend	= ohci_hcd_at91_drv_suspend,
 	.resume		= ohci_hcd_at91_drv_resume,
 	.driver		= {
diff --git a/drivers/usb/host/ohci-au1xxx.c b/drivers/usb/host/ohci-au1xxx.c
index 44ed3a4..24e23c5 100644
--- a/drivers/usb/host/ohci-au1xxx.c
+++ b/drivers/usb/host/ohci-au1xxx.c
@@ -269,6 +269,7 @@ static const struct hc_driver ohci_au1xxx_hc_driver = {
 	 */
 	.start =		ohci_au1xxx_start,
 	.stop =			ohci_stop,
+	.shutdown = 		ohci_shutdown,
 
 	/*
 	 * managing i/o requests and associated device resources
@@ -335,6 +336,7 @@ static int ohci_hcd_au1xxx_drv_resume(struct platform_device *dev)
 static struct platform_driver ohci_hcd_au1xxx_driver = {
 	.probe		= ohci_hcd_au1xxx_drv_probe,
 	.remove		= ohci_hcd_au1xxx_drv_remove,
+	.shutdown 	= usb_hcd_platform_shutdown,
 	/*.suspend	= ohci_hcd_au1xxx_drv_suspend, */
 	/*.resume	= ohci_hcd_au1xxx_drv_resume, */
 	.driver		= {
diff --git a/drivers/usb/host/ohci-ep93xx.c b/drivers/usb/host/ohci-ep93xx.c
index 1a1d320..1bf5e7a 100644
--- a/drivers/usb/host/ohci-ep93xx.c
+++ b/drivers/usb/host/ohci-ep93xx.c
@@ -128,6 +128,7 @@ static struct hc_driver ohci_ep93xx_hc_driver = {
 	.flags			= HCD_USB11 | HCD_MEMORY,
 	.start			= ohci_ep93xx_start,
 	.stop			= ohci_stop,
+	.shutdown		= ohci_shutdown,
 	.urb_enqueue		= ohci_urb_enqueue,
 	.urb_dequeue		= ohci_urb_dequeue,
 	.endpoint_disable	= ohci_endpoint_disable,
@@ -203,6 +204,7 @@ static int ohci_hcd_ep93xx_drv_resume(struct platform_device *pdev)
 static struct platform_driver ohci_hcd_ep93xx_driver = {
 	.probe		= ohci_hcd_ep93xx_drv_probe,
 	.remove		= ohci_hcd_ep93xx_drv_remove,
+	.shutdown 	= usb_hcd_platform_shutdown,
 #ifdef CONFIG_PM
 	.suspend	= ohci_hcd_ep93xx_drv_suspend,
 	.resume		= ohci_hcd_ep93xx_drv_resume,
diff --git a/drivers/usb/host/ohci-hcd.c b/drivers/usb/host/ohci-hcd.c
index 7c3d8c6..2c614af 100644
--- a/drivers/usb/host/ohci-hcd.c
+++ b/drivers/usb/host/ohci-hcd.c
@@ -136,7 +136,6 @@ static const char	hcd_name [] = "ohci_hcd";
 static void ohci_dump (struct ohci_hcd *ohci, int verbose);
 static int ohci_init (struct ohci_hcd *ohci);
 static void ohci_stop (struct usb_hcd *hcd);
-static int ohci_reboot (struct notifier_block *, unsigned long , void *);
 
 #include "ohci-hub.c"
 #include "ohci-dbg.c"
@@ -419,21 +418,20 @@ static void ohci_usb_reset (struct ohci_hcd *ohci)
 	ohci_writel (ohci, ohci->hc_control, &ohci->regs->control);
 }
 
-/* reboot notifier forcibly disables IRQs and DMA, helping kexec and
+/* ohci_shutdown forcibly disables IRQs and DMA, helping kexec and
  * other cases where the next software may expect clean state from the
  * "firmware".  this is bus-neutral, unlike shutdown() methods.
  */
-static int
-ohci_reboot (struct notifier_block *block, unsigned long code, void *null)
+static void
+ohci_shutdown (struct usb_hcd *hcd)
 {
 	struct ohci_hcd *ohci;
 
-	ohci = container_of (block, struct ohci_hcd, reboot_notifier);
+	ohci = hcd_to_ohci (hcd);
 	ohci_writel (ohci, OHCI_INTR_MIE, &ohci->regs->intrdisable);
 	ohci_usb_reset (ohci);
 	/* flush the writes */
 	(void) ohci_readl (ohci, &ohci->regs->control);
-	return 0;
 }
 
 /*-------------------------------------------------------------------------*
@@ -504,7 +502,6 @@ static int ohci_init (struct ohci_hcd *ohci)
 	if ((ret = ohci_mem_init (ohci)) < 0)
 		ohci_stop (hcd);
 	else {
-		register_reboot_notifier (&ohci->reboot_notifier);
 		create_debug_files (ohci);
 	}
 
@@ -800,7 +797,6 @@ static void ohci_stop (struct usb_hcd *hcd)
 	ohci_writel (ohci, OHCI_INTR_MIE, &ohci->regs->intrdisable);
 	
 	remove_debug_files (ohci);
-	unregister_reboot_notifier (&ohci->reboot_notifier);
 	ohci_mem_cleanup (ohci);
 	if (ohci->hcca) {
 		dma_free_coherent (hcd->self.controller, 
diff --git a/drivers/usb/host/ohci-lh7a404.c b/drivers/usb/host/ohci-lh7a404.c
index f2c9161..e121d97 100644
--- a/drivers/usb/host/ohci-lh7a404.c
+++ b/drivers/usb/host/ohci-lh7a404.c
@@ -174,6 +174,7 @@ static const struct hc_driver ohci_lh7a404_hc_driver = {
 	 */
 	.start =		ohci_lh7a404_start,
 	.stop =			ohci_stop,
+	.shutdown = 		ohci_shutdown,
 
 	/*
 	 * managing i/o requests and associated device resources
@@ -241,6 +242,7 @@ static int ohci_hcd_lh7a404_drv_resume(struct platform_device *dev)
 static struct platform_driver ohci_hcd_lh7a404_driver = {
 	.probe		= ohci_hcd_lh7a404_drv_probe,
 	.remove		= ohci_hcd_lh7a404_drv_remove,
+	.shutdown 	= usb_hcd_platform_shutdown,
 	/*.suspend	= ohci_hcd_lh7a404_drv_suspend, */
 	/*.resume	= ohci_hcd_lh7a404_drv_resume, */
 	.driver		= {
diff --git a/drivers/usb/host/ohci-mem.c b/drivers/usb/host/ohci-mem.c
index bfbe328..d976614 100644
--- a/drivers/usb/host/ohci-mem.c
+++ b/drivers/usb/host/ohci-mem.c
@@ -28,7 +28,6 @@ static void ohci_hcd_init (struct ohci_hcd *ohci)
 	ohci->next_statechange = jiffies;
 	spin_lock_init (&ohci->lock);
 	INIT_LIST_HEAD (&ohci->pending);
-	ohci->reboot_notifier.notifier_call = ohci_reboot;
 }
 
 /*-------------------------------------------------------------------------*/
diff --git a/drivers/usb/host/ohci-omap.c b/drivers/usb/host/ohci-omap.c
index 160cd4c..9c02177 100644
--- a/drivers/usb/host/ohci-omap.c
+++ b/drivers/usb/host/ohci-omap.c
@@ -447,6 +447,7 @@ static const struct hc_driver ohci_omap_hc_driver = {
 	.reset =		ohci_omap_init,
 	.start =		ohci_omap_start,
 	.stop =			ohci_omap_stop,
+	.shutdown = 		ohci_shutdown,
 
 	/*
 	 * managing i/o requests and associated device resources
@@ -532,6 +533,7 @@ static int ohci_omap_resume(struct platform_device *dev)
 static struct platform_driver ohci_hcd_omap_driver = {
 	.probe		= ohci_hcd_omap_drv_probe,
 	.remove		= ohci_hcd_omap_drv_remove,
+	.shutdown 	= usb_hcd_platform_shutdown,
 #ifdef	CONFIG_PM
 	.suspend	= ohci_omap_suspend,
 	.resume		= ohci_omap_resume,
diff --git a/drivers/usb/host/ohci-pci.c b/drivers/usb/host/ohci-pci.c
index ef87444..3732db7 100644
--- a/drivers/usb/host/ohci-pci.c
+++ b/drivers/usb/host/ohci-pci.c
@@ -177,6 +177,7 @@ static const struct hc_driver ohci_pci_hc_driver = {
 	.reset =		ohci_pci_reset,
 	.start =		ohci_pci_start,
 	.stop =			ohci_stop,
+	.shutdown =		ohci_shutdown,
 
 #ifdef	CONFIG_PM
 	/* these suspend/resume entries are for upstream PCI glue ONLY */
@@ -232,6 +233,8 @@ static struct pci_driver ohci_pci_driver = {
 	.suspend =	usb_hcd_pci_suspend,
 	.resume =	usb_hcd_pci_resume,
 #endif
+
+	.shutdown =	usb_hcd_pci_shutdown,
 };
 
  
diff --git a/drivers/usb/host/ohci-ppc-soc.c b/drivers/usb/host/ohci-ppc-soc.c
index 270aaaa..d9d1ae2 100644
--- a/drivers/usb/host/ohci-ppc-soc.c
+++ b/drivers/usb/host/ohci-ppc-soc.c
@@ -148,6 +148,7 @@ static const struct hc_driver ohci_ppc_soc_hc_driver = {
 	 */
 	.start =		ohci_ppc_soc_start,
 	.stop =			ohci_stop,
+	.shutdown = 		ohci_shutdown,
 
 	/*
 	 * managing i/o requests and associated device resources
@@ -196,6 +197,7 @@ static int ohci_hcd_ppc_soc_drv_remove(struct platform_device *pdev)
 static struct platform_driver ohci_hcd_ppc_soc_driver = {
 	.probe		= ohci_hcd_ppc_soc_drv_probe,
 	.remove		= ohci_hcd_ppc_soc_drv_remove,
+	.shutdown 	= usb_hcd_platform_shutdown,
 #ifdef	CONFIG_PM
 	/*.suspend	= ohci_hcd_ppc_soc_drv_suspend,*/
 	/*.resume	= ohci_hcd_ppc_soc_drv_resume,*/
diff --git a/drivers/usb/host/ohci-pxa27x.c b/drivers/usb/host/ohci-pxa27x.c
index 2752d36..e176b04 100644
--- a/drivers/usb/host/ohci-pxa27x.c
+++ b/drivers/usb/host/ohci-pxa27x.c
@@ -270,6 +270,7 @@ static const struct hc_driver ohci_pxa27x_hc_driver = {
 	 */
 	.start =		ohci_pxa27x_start,
 	.stop =			ohci_stop,
+	.shutdown = 		ohci_shutdown,
 
 	/*
 	 * managing i/o requests and associated device resources
@@ -358,6 +359,7 @@ static int ohci_hcd_pxa27x_drv_resume(struct platform_device *pdev)
 static struct platform_driver ohci_hcd_pxa27x_driver = {
 	.probe		= ohci_hcd_pxa27x_drv_probe,
 	.remove		= ohci_hcd_pxa27x_drv_remove,
+	.shutdown 	= usb_hcd_platform_shutdown,
 #ifdef CONFIG_PM
 	.suspend	= ohci_hcd_pxa27x_drv_suspend, 
 	.resume		= ohci_hcd_pxa27x_drv_resume,
diff --git a/drivers/usb/host/ohci-s3c2410.c b/drivers/usb/host/ohci-s3c2410.c
index cd37edd..59e4364 100644
--- a/drivers/usb/host/ohci-s3c2410.c
+++ b/drivers/usb/host/ohci-s3c2410.c
@@ -447,6 +447,7 @@ static const struct hc_driver ohci_s3c2410_hc_driver = {
 	 */
 	.start =		ohci_s3c2410_start,
 	.stop =			ohci_stop,
+	.shutdown = 		ohci_shutdown,
 
 	/*
 	 * managing i/o requests and associated device resources
@@ -491,6 +492,7 @@ static int ohci_hcd_s3c2410_drv_remove(struct platform_device *pdev)
 static struct platform_driver ohci_hcd_s3c2410_driver = {
 	.probe		= ohci_hcd_s3c2410_drv_probe,
 	.remove		= ohci_hcd_s3c2410_drv_remove,
+	.shutdown 	= usb_hcd_platform_shutdown,
 	/*.suspend	= ohci_hcd_s3c2410_drv_suspend, */
 	/*.resume	= ohci_hcd_s3c2410_drv_resume, */
 	.driver		= {
diff --git a/drivers/usb/host/ohci.h b/drivers/usb/host/ohci.h
index caacf14..650d1bf 100644
--- a/drivers/usb/host/ohci.h
+++ b/drivers/usb/host/ohci.h
@@ -389,8 +389,6 @@ struct ohci_hcd {
 	unsigned long		next_statechange;	/* suspend/resume */
 	u32			fminterval;		/* saved register */
 
-	struct notifier_block	reboot_notifier;
-
 	unsigned long		flags;		/* for HC bugs */
 #define	OHCI_QUIRK_AMD756	0x01			/* erratum #4 */
 #define	OHCI_QUIRK_SUPERIO	0x02			/* natsemi */