kern/116537: [fdc] [patch] kldunload fdc.ko locks forever due to missing wakeup()

[Eugene Grosbein]

>Number:         116537
>Category:       kern
>Synopsis:       [fdc] [patch] kldunload fdc.ko locks forever due to missing wakeup()
>Confidential:   no
>Severity:       non-critical
>Priority:       low
>Responsible:    freebsd-bugs
>State:          open
>Quarter:        
>Keywords:       
>Date-Required:
>Class:          sw-bug
>Submitter-Id:   current-users
>Arrival-Date:   Sat Sep 22 05:20:01 GMT 2007
>Closed-Date:
>Last-Modified:
>Originator:     Eugene Grosbein
>Release:        FreeBSD 6.2-STABLE i386
>Organization:
Svyaz-Service JSC
>Environment:
System: FreeBSD grosbein.pp.ru 6.2-STABLE FreeBSD 6.2-STABLE #2: Sun Sep 16 16:54:23 KRAST 2007 eu at grosbein.pp.ru:/home/obj/usr/local/src/sys/DADV i386

>Description:

	An attempt to unload kernel module fdc.ko results in
	kldunload waiting forever in state 'fdcdet'.

>How-To-Repeat:
	kldunload fdc.ko

>Fix:

--- sys/dev/fdc/fdc.c.orig	2007-09-15 16:53:23.000000000 +0800
+++ sys/dev/fdc/fdc.c	2007-09-16 16:26:07.000000000 +0800
@@ -1195,6 +1198,7 @@
 		mtx_lock(&fdc->fdc_mtx);
 	}
 	fdc->flags &= ~(FDC_KTHREAD_EXIT | FDC_KTHREAD_ALIVE);
+	wakeup(&fdc->fdc_thread);
 	mtx_unlock(&fdc->fdc_mtx);
 
 	kthread_exit(0);

>Release-Note:
>Audit-Trail:
>Unformatted: