[Intel-gfx] 4.2-rc4 kernel warnings on HSW laptop [regression]

[Takashi Iwai]

On Mon, 12 Oct 2015 14:29:19 +0200,
Takashi Iwai wrote:
> 
> > > Then a warning when I start powertop:
> > > 
> > >  WARNING: CPU: 1 PID: 1674 at drivers/gpu/drm/drm_atomic.c:889 drm_atomic_get_property+0x232/0x2b0 [drm]()
> > >  CPU: 1 PID: 1674 Comm: powertop Tainted: G        W       4.3.0-rc4-test+ #93
> > >  Hardware name: Hewlett-Packard HP ProBook 430 G1/1946, BIOS L73 Ver. 08.05 2013/03/15
> > >   ffffffffa005b289 ffff880059173ca8 ffffffff81346fa9 0000000000000000
> > >   ffff880059173ce0 ffffffff81063232 ffff8800372bc028 ffff8800373f3740
> > >   ffff8800372bc000 ffff880062ad37c0 0000000000000001 ffff880059173cf0
> > >  Call Trace:
> > >   [<ffffffff81346fa9>] dump_stack+0x4b/0x72
> > >   [<ffffffff81063232>] warn_slowpath_common+0x82/0xc0
> > >   [<ffffffff8106332a>] warn_slowpath_null+0x1a/0x20
> > >   [<ffffffffa0047a12>] drm_atomic_get_property+0x232/0x2b0 [drm]
> > >   [<ffffffffa00356dc>] drm_object_property_get_value+0x6c/0x70 [drm]
> > >   [<ffffffffa003330f>] dpms_show+0x2f/0x70 [drm]
> > >   [<ffffffff8145f090>] dev_attr_show+0x20/0x50
> > >   [<ffffffff8124b48c>] sysfs_kf_seq_show+0xbc/0x130
> > >   [<ffffffff81249d73>] kernfs_seq_show+0x23/0x30
> > >   [<ffffffff811f3d8a>] seq_read+0xca/0x360
> > >   [<ffffffff8124a7da>] kernfs_fop_read+0x10a/0x160
> > >   [<ffffffff811d0888>] __vfs_read+0x28/0xd0
> > >   [<ffffffff812cbe80>] ? security_file_permission+0xa0/0xc0
> > >   [<ffffffff811d102f>] ? rw_verify_area+0x4f/0xe0
> > >   [<ffffffff811d1143>] vfs_read+0x83/0x130
> > >   [<ffffffff811d1df6>] SyS_read+0x46/0xa0
> > >   [<ffffffff81001b40>] ? syscall_return_slowpath+0x50/0x130
> > >   [<ffffffff81659636>] entry_SYSCALL_64_fastpath+0x16/0x75
> > > 
> > > 
> > > Both don't look like serious issues, but not sexy to see at each time.
> > 
> > This should be fixed with
> > 
> > commit 621bd0f6982badd6483acb191eb7b6226a578328
> > Author: Daniel Vetter <daniel.vetter at ffwll.ch>
> > Date:   Tue Sep 29 09:56:53 2015 +0200
> > 
> >     drm: Fix locking for sysfs dpms file
> > 
> > If not please scream.
> 
> OK, I'll give a shot.

This one was confirmed to work.  Feel free to my tested-by tag if you
can still add.
  Tested-by: Takashi Iwai <tiwai at suse.de>


thanks,

Takashi