linux-kernel - Re: WARNING: at drivers/base/sys.c:183 sysdev_driver

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Message-Id: <1210140983.5376.2.camel@marge.simson.net>
Date:	Wed, 07 May 2008 08:16:23 +0200
From:	Mike Galbraith <efault@....de>
To:	"Rafael J. Wysocki" <rjw@...k.pl>
Cc:	Ingo Molnar <mingo@...e.hu>, Len Brown <lenb@...nel.org>,
	linux-kernel@...r.kernel.org
Subject: Re: WARNING: at drivers/base/sys.c:183 sysdev_driver_register+0x7a


On Wed, 2008-05-07 at 00:39 +0200, Rafael J. Wysocki wrote:
> On Tuesday, 22 of April 2008, Mike Galbraith wrote:
> > 
> > On Tue, 2008-04-22 at 09:53 +0200, Ingo Molnar wrote:
> > > hi Len,
> > > 
> > > randconfig boot testing found this new debug warning message in the 
> > > syslog:
> > 
> > Ditto with Q6600 and v2.6.25-3410-g8075014.
> 
> Does it still happen with the current -git?

No, it was fixed by:

commit db176c6ed8974fae94328ad5ac9e70b094ff22fd
Author: OGAWA Hirofumi <hirofumi@...l.parknet.co.jp>
Date:   Wed May 7 04:02:53 2008 +0900

    Fix bogus warning in sysdev_driver_register()
    
            if ((drv->entry.next != drv->entry.prev) ||
                (drv->entry.next != NULL)) {
    
    warns list_empty(&drv->entry).
    
    Signed-off-by: OGAWA Hirofumi <hirofumi@...l.parknet.co.jp>
    Cc: Greg KH <gregkh@...e.de>
    Cc: Len Brown <lenb@...nel.org>
    [ Version 2 totally redone based on suggestions from Linus & Greg ]
    Signed-off-by: Linus Torvalds <torvalds@...ux-foundation.org>

diff --git a/drivers/base/sys.c b/drivers/base/sys.c
index 4fbb56b..358bb0b 100644
--- a/drivers/base/sys.c
+++ b/drivers/base/sys.c
@@ -175,8 +175,7 @@ int sysdev_driver_register(struct sysdev_class *cls, struct sysdev_driver *drv)
 	}
 
 	/* Check whether this driver has already been added to a class. */
-	if ((drv->entry.next != drv->entry.prev) ||
-	    (drv->entry.next != NULL)) {
+	if (drv->entry.next && !list_empty(&drv->entry)) {
 		printk(KERN_WARNING "sysdev: class %s: driver (%p) has already"
 			" been registered to a class, something is wrong, but "
 			"will forge on!\n", cls->name, drv);




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