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When enabling the CRTC after waking up from a power-saving mode, the
primary plane's framebuffer might be NULL, which leads to a stack trace
as shown below.
[ 632.624608] BUG: kernel NULL pointer dereference, address: 0000000000000048
[ 632.624631] #PF: supervisor read access in kernel mode
[ 632.624639] #PF: error_code(0x0000) - not-present page
[ 632.624647] PGD 0 P4D 0
[ 632.624654] Oops: 0000 [#1] SMP PTI
[ 632.624662] CPU: 0 PID: 2082 Comm: gnome-shell Tainted: G E 5.4.0-rc7-1-default+ #114
[ 632.624673] Hardware name: Sun Microsystems SUN FIRE X2270 M2/SUN FIRE X2270 M2, BIOS 2.05 07/01/2010
[ 632.624689] RIP: 0010:ast_crtc_helper_atomic_enable+0x7d/0x680 [ast]
[ 632.624698] Code: 48 8b 80 e0 02 00 00 4c 8b 60 10 31 c0 f3 48 ab 48 8b 83 78 04 00 00 4c 89 ef 48 8d 70 18 e8 9a e9 55 ce 48 8b 83 78 04 00 00 <49> 8b 7c 24 48 4c 89 ea 4c 8d 44 24 28 48 8d 4c 24 20 48 8d 70 18
[ 632.624718] RSP: 0018:ffffbe9ec123fa40 EFLAGS: 00010246
[ 632.624726] RAX: ffff95a13cfd3400 RBX: ffff95a13cf32000 RCX: 0000000000000000
[ 632.624735] RDX: 0000000000000000 RSI: ffff95a13cfd34e8 RDI: ffffbe9ec123fb40
[ 632.624744] RBP: ffffbe9ec123fb80 R08: 0000000000000000 R09: 0000000000000003
[ 632.624753] R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000
[ 632.624762] R13: ffffbe9ec123fa70 R14: ffff95a13beb7000 R15: ffff95a13cf32800
[ 632.624772] FS: 00007f6d2763e140(0000) GS:ffff95a134000000(0000) knlGS:0000000000000000
[ 632.624782] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 632.624790] CR2: 0000000000000048 CR3: 00000001192f8004 CR4: 00000000000206f0
[ 632.624800] Call Trace:
[ 632.624811] ? __lock_acquire+0x409/0x7c0
[ 632.624830] drm_atomic_helper_commit_modeset_enables+0x1af/0x200
[ 632.624840] drm_atomic_helper_commit_tail+0x32/0x70
[ 632.624849] commit_tail+0xc7/0x110
[ 632.624857] drm_atomic_helper_commit+0x121/0x130
[ 632.624867] drm_atomic_connector_commit_dpms+0xd7/0x100
[ 632.624878] set_property_atomic+0xaf/0x110
[ 632.624890] drm_mode_obj_set_property_ioctl+0xbb/0x190
[ 632.624899] ? drm_mode_obj_find_prop_id+0x40/0x40
[ 632.624909] drm_ioctl_kernel+0x86/0xd0
[ 632.624918] drm_ioctl+0x1e4/0x36b
[ 632.624925] ? drm_mode_obj_find_prop_id+0x40/0x40
[ 632.624939] do_vfs_ioctl+0x4bd/0x6e0
[ 632.624949] ksys_ioctl+0x5e/0x90
[ 632.624957] __x64_sys_ioctl+0x16/0x20
[ 632.624966] do_syscall_64+0x5a/0x220
[ 632.624976] entry_SYSCALL_64_after_hwframe+0x49/0xbe
[ 632.624984] RIP: 0033:0x7f6d2b0de387
[ 632.624991] Code: 00 00 90 48 8b 05 f9 9a 0c 00 64 c7 00 26 00 00 00 48 c7 c0 ff ff ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 b8 10 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 8b 0d c9 9a 0c 00 f7 d8 64 89 01 48
[ 632.625011] RSP: 002b:00007fffb49def38 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
[ 632.625021] RAX: ffffffffffffffda RBX: 00007fffb49def70 RCX: 00007f6d2b0de387
[ 632.625030] RDX: 00007fffb49def70 RSI: 00000000c01864ba RDI: 0000000000000009
[ 632.625040] RBP: 00000000c01864ba R08: 0000000000000000 R09: 00000000c0c0c0c0
[ 632.625049] R10: 0000000000000030 R11: 0000000000000246 R12: 000055bc367eb920
[ 632.625058] R13: 0000000000000009 R14: 0000000000000002 R15: 0000000000000000
[ 632.625071] Modules linked in: ebtable_filter(E) ebtables(E) ip6table_filter(E) ip6_tables(E) iptable_filter(E) ip_tables(E) x_tables(E) af_packet(E) scsi_transport_iscsi(E) dmi_sysfs(E) msr(E) xfs(E) intel_powerclamp(E) coretemp(E) k)
[ 632.625185] CR2: 0000000000000048
The STR is
* start gdm and wait for it to switch off the display
* wake up the display by pressing a key
CRTC modesetting depends on the new state of the CRTC and the primary
plane's framebuffer. The bugfix moves the modesetting code into the
CRTC's atomic_flush() function, where it is protected from the plane's
framebuffer being NULL.
The CRTC's atomic-enable function, which is the modesetting's original
location, still contains DPMS state handling. It's exactly the inverse
of the atomic-disable function.
v3:
* protect modesetting from from fb == NULL
v2:
* do an atomic check for plane
* reject invisible primary planes
Signed-off-by: Thomas Zimmermann <tzimmermann@suse.de>
Acked-by: Gerd Hoffmann <kraxel@redhat.com>
Fixes: b48e1b6ffd ("drm/ast: Add CRTC helpers for atomic modesetting")
Cc: Gerd Hoffmann <kraxel@redhat.com>
Cc: Dave Airlie <airlied@redhat.com>
Cc: Daniel Vetter <daniel.vetter@ffwll.ch>
Cc: "Y.C. Chen" <yc_chen@aspeedtech.com>
Cc: Sam Ravnborg <sam@ravnborg.org>
Link: https://patchwork.freedesktop.org/patch/msgid/20191202111557.15176-2-tzimmermann@suse.de
Linux kernel
============
There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.
In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``. The formatted documentation can also be read online at:
https://www.kernel.org/doc/html/latest/
There are various text files in the Documentation/ subdirectory,
several of them using the Restructured Text markup notation.
Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.