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From: Hans Petter Selasky <hselasky@FreeBSD.org>
Date: Fri, 4 Nov 2011 09:19:18 +0000 (UTC)
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Subject: svn commit: r227075 - head/sys/dev/usb
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Author: hselasky
Date: Fri Nov  4 09:19:18 2011
New Revision: 227075
URL: http://svn.freebsd.org/changeset/base/227075

Log:
  Fix for panic at USB controller attach failure during cold boot.
  
  Reported by:	Jan Henrik Sylvester, Xin LI and more.
  MFC after:	3 days

Modified:
  head/sys/dev/usb/usb_process.c

Modified: head/sys/dev/usb/usb_process.c
==============================================================================
--- head/sys/dev/usb/usb_process.c	Fri Nov  4 06:56:59 2011	(r227074)
+++ head/sys/dev/usb/usb_process.c	Fri Nov  4 09:19:18 2011	(r227075)
@@ -67,11 +67,13 @@ static int usb_pcount;
 #define	USB_THREAD_CREATE(f, s, p, ...) \
 		kproc_kthread_add((f), (s), &usbproc, (p), RFHIGHPID, \
 		    0, "usb", __VA_ARGS__)
+#define	USB_THREAD_SUSPEND_CHECK() kthread_suspend_check()
 #define	USB_THREAD_SUSPEND(p)   kthread_suspend(p,0)
 #define	USB_THREAD_EXIT(err)	kthread_exit()
 #else
 #define	USB_THREAD_CREATE(f, s, p, ...) \
 		kthread_create((f), (s), (p), RFHIGHPID, 0, __VA_ARGS__)
+#define	USB_THREAD_SUSPEND_CHECK() kthread_suspend_check()
 #define	USB_THREAD_SUSPEND(p)   kthread_suspend(p,0)
 #define	USB_THREAD_EXIT(err)	kthread_exit(err)
 #endif
@@ -98,6 +100,9 @@ usb_process(void *arg)
 	struct usb_proc_msg *pm;
 	struct thread *td;
 
+	/* in case of attach error, check for suspended */
+	USB_THREAD_SUSPEND_CHECK();
+
 	/* adjust priority */
 	td = curthread;
 	thread_lock(td);