linux-kernel - Re: intel_sdvo_init: trying to register non-static key

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Message-ID: <1391791674.21697.2.camel@intelbox>
Date:	Fri, 07 Feb 2014 18:47:54 +0200
From:	Imre Deak <imre.deak@...el.com>
To:	Borislav Petkov <bp@...en8.de>
Cc:	Daniel Vetter <daniel@...ll.ch>,
	Jani Nikula <jani.nikula@...ux.intel.com>,
	intel-gfx@...ts.freedesktop.org,
	Daniel Vetter <daniel.vetter@...ll.ch>,
	David Airlie <airlied@...ux.ie>,
	dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org
Subject: Re: intel_sdvo_init: trying to register non-static key

On Fri, 2014-02-07 at 16:49 +0100, Borislav Petkov wrote:
> On Fri, Feb 07, 2014 at 05:32:06PM +0200, Imre Deak wrote:
> > I just realized it's a different issue, since it's on the init path.
> > Also we set the drm device as the parent for the sdvo i2c adapter as
> > opposed to the dp i2c adapter where it's the connector device. So the
> > above patch won't help in Borislav's case.

Ok, not sure why the sdvo initialization fails, but the lockdep warning
is probably fixed by the below patch. Could you try it and send a dmesg
with drm.debug=0xe?

diff --git a/fs/kernfs/dir.c b/fs/kernfs/dir.c
index 5104cf5..bd6e18b 100644
--- a/fs/kernfs/dir.c
+++ b/fs/kernfs/dir.c
@@ -187,19 +187,23 @@ static void kernfs_deactivate(struct kernfs_node
*kn)
 
 	kn->u.completion = (void *)&wait;
 
-	rwsem_acquire(&kn->dep_map, 0, 0, _RET_IP_);
+	if (kn->flags & KERNFS_LOCKDEP)
+		rwsem_acquire(&kn->dep_map, 0, 0, _RET_IP_);
 	/* atomic_add_return() is a mb(), put_active() will always see
 	 * the updated kn->u.completion.
 	 */
 	v = atomic_add_return(KN_DEACTIVATED_BIAS, &kn->active);
 
 	if (v != KN_DEACTIVATED_BIAS) {
-		lock_contended(&kn->dep_map, _RET_IP_);
+		if (kn->flags & KERNFS_LOCKDEP)
+			lock_contended(&kn->dep_map, _RET_IP_);
 		wait_for_completion(&wait);
 	}
 
-	lock_acquired(&kn->dep_map, _RET_IP_);
-	rwsem_release(&kn->dep_map, 1, _RET_IP_);
+	if (kn->flags & KERNFS_LOCKDEP) {
+		lock_acquired(&kn->dep_map, _RET_IP_);
+		rwsem_release(&kn->dep_map, 1, _RET_IP_);
+	}
 }
 



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