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7015f127d8
Beware dereferencing the NULL pointer prior to checking for its
existence.
<1>[ 3.324694] BUG: kernel NULL pointer dereference, address: 0000000000000000
<1>[ 3.324696] #PF: supervisor read access in kernel mode
<4>[ 3.324704] hardirqs last enabled at (751): [<ffffffff812a4f77>] d_lookup+0x57/0xa0
<1>[ 3.324709] #PF: error_code(0x0000) - not-present page
<4>[ 3.324716] hardirqs last disabled at (752): [<ffffffff8125a1b9>] __slab_alloc.isra.89.constprop.94+0x19/0x70
<4>[ 3.324720] softirqs last enabled at (402): [<ffffffff81e00385>] __do_softirq+0x385/0x47f
<6>[ 3.324725] PGD 0 P4D 0
<4>[ 3.324733] softirqs last disabled at (395): [<ffffffff810bab6a>] irq_exit+0xba/0xc0
<4>[ 3.324762] Oops: 0000 [#1] PREEMPT SMP PTI
<4>[ 3.324768] CPU: 0 PID: 380 Comm: systemd-udevd Not tainted 5.6.0-rc7-CI-CI_DRM_8189+ #1
<4>[ 3.324776] Hardware name: MSI MS-7924/Z97M-G43(MS-7924), BIOS V1.12 02/15/2016
<4>[ 3.324840] RIP: 0010:intel_read_infoframe+0x3a/0x170 [i915]
<4>[ 3.324848] Code: 65 48 8b 04 25 28 00 00 00 48 89 44 24 20 31 c0 83 f9 0a 77 12 ba 01 00 00 00 48 d3 e2 f7 c2 c0 05 00 00 48 0f 45 c7 83 fb 03 <4c> 8b 20 0f 84 f2 00 00 00 83 fb 0a 0f 84 f3 00 00 00 83 fb 07 0f
<4>[ 3.324865] RSP: 0018:ffffc900005438b0 EFLAGS: 00010212
<4>[ 3.324871] RAX: 0000000000000000 RBX: 0000000000000082 RCX: 0000000000000001
<4>[ 3.324879] RDX: 0000000000000002 RSI: ffff8883f8309000 RDI: ffff8883f80cbe00
<4>[ 3.324887] RBP: ffff8883f8309b34 R08: 000000000000000e R09: 0000000000000001
<4>[ 3.324894] R10: 0000000000000000 R11: 0000000000000000 R12: ffff8883f7ac0000
<4>[ 3.324901] R13: ffff8883f7ac0000 R14: ffff8883f7ac0d90 R15: ffff8883f844d000
<4>[ 3.324908] FS: 00007ffa4a839680(0000) GS:ffff888410000000(0000) knlGS:0000000000000000
<4>[ 3.324917] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
<4>[ 3.324923] CR2: 0000000000000000 CR3: 0000000401aa4002 CR4: 00000000001606f0
<4>[ 3.324930] Call Trace:
<4>[ 3.324980] ? gen6_read32+0x272/0x300 [i915]
<4>[ 3.325044] intel_ddi_get_config+0x238/0x610 [i915]
<4>[ 3.325108] hsw_crt_get_config+0x12/0x40 [i915]
<4>[ 3.325173] intel_modeset_setup_hw_state+0x3b3/0x1660 [i915]
<4>[ 3.325182] ? ww_mutex_lock+0x39/0x70
<4>[ 3.325190] ? drm_modeset_lock+0xad/0x120
<4>[ 3.325254] intel_modeset_init+0x582/0x1c50 [i915]
Fixes: 419190429c ("drm/i915/hdmi: use struct drm_device based logging")
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Wambui Karuga <wambui.karugax@gmail.com>
Cc: Jani Nikula <jani.nikula@intel.com>
Cc: "Ville Syrjälä" <ville.syrjala@linux.intel.com>
Reviewed-by: Jani Nikula <jani.nikula@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20200326082838.16357-1-chris@chris-wilson.co.uk
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.