Chris Wilson e9681366ea drm/i915: Do not store the error pointer for a failed userptr registration ... If we fail to create our mmu notification, we report the error back and currently store the error inside the i915_mm_struct. This not only causes subsequent registerations of the same mm to fail (an issue if the first was interrupted by a signal and needed to be restarted) but also causes us to eventually try and free the error pointer. [ 73.419599] BUG: unable to handle kernel NULL pointer dereference at 000000000000004c [ 73.419831] IP: [<ffffffff8114af33>] mmu_notifier_unregister+0x23/0x130 [ 73.420065] PGD 8650c067 PUD 870bb067 PMD 0 [ 73.420319] Oops: 0000 [#1] SMP DEBUG_PAGEALLOC [ 73.420580] CPU: 0 PID: 42 Comm: kworker/0:1 Tainted: G W 3.17.0-rc6+ #1561 [ 73.420837] Hardware name: Intel Corporation SandyBridge Platform/LosLunas CRB, BIOS ASNBCPT1.86C.0075.P00.1106281639 06/28/2011 [ 73.421405] Workqueue: events __i915_mm_struct_free__worker [ 73.421724] task: ffff880088a81220 ti: ffff880088168000 task.ti: ffff880088168000 [ 73.422051] RIP: 0010:[<ffffffff8114af33>] [<ffffffff8114af33>] mmu_notifier_unregister+0x23/0x130 [ 73.422410] RSP: 0018:ffff88008816bd50 EFLAGS: 00010286 [ 73.422765] RAX: 0000000000000003 RBX: ffff880086485400 RCX: 0000000000000000 [ 73.423137] RDX: ffff88016d80ee90 RSI: ffff880086485400 RDI: 0000000000000044 [ 73.423513] RBP: ffff88008816bd70 R08: 0000000000000001 R09: 0000000000000000 [ 73.423895] R10: 0000000000000320 R11: 0000000000000001 R12: 0000000000000044 [ 73.424282] R13: ffff880166e5f008 R14: ffff88016d815200 R15: ffff880166e5f040 [ 73.424682] FS: 0000000000000000(0000) GS:ffff88016d800000(0000) knlGS:0000000000000000 [ 73.425099] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 73.425537] CR2: 000000000000004c CR3: 0000000087f5f000 CR4: 00000000000407f0 [ 73.426157] Stack: [ 73.426597] ffff880088a81248 ffff880166e5f038 fffffffffffffffc ffff880166e5f008 [ 73.427096] ffff88008816bd98 ffffffff814a75f2 ffff880166e5f038 ffff8800880f8a28 [ 73.427603] ffff88016d812ac0 ffff88008816be00 ffffffff8106321a ffffffff810631af [ 73.428119] Call Trace: [ 73.428606] [<ffffffff814a75f2>] __i915_mm_struct_free__worker+0x42/0x80 [ 73.429116] [<ffffffff8106321a>] process_one_work+0x1ba/0x610 [ 73.429632] [<ffffffff810631af>] ? process_one_work+0x14f/0x610 [ 73.430153] [<ffffffff810636db>] worker_thread+0x6b/0x4a0 [ 73.430671] [<ffffffff8108d67d>] ? trace_hardirqs_on+0xd/0x10 [ 73.431501] [<ffffffff81063670>] ? process_one_work+0x610/0x610 [ 73.432030] [<ffffffff8106a206>] kthread+0xf6/0x110 [ 73.432561] [<ffffffff8106a110>] ? __kthread_parkme+0x80/0x80 [ 73.433100] [<ffffffff8169c22c>] ret_from_fork+0x7c/0xb0 [ 73.433644] [<ffffffff8106a110>] ? __kthread_parkme+0x80/0x80 [ 73.434194] Code: 0f 1f 84 00 00 00 00 00 66 66 66 66 90 8b 46 4c 85 c0 0f 8e 10 01 00 00 55 48 89 e5 41 55 41 54 53 48 89 f3 49 89 fc 48 83 ec 08 <48> 83 7f 08 00 0f 84 b1 00 00 00 48 c7 c7 40 e6 ac 82 e8 26 65 [ 73.435942] RIP [<ffffffff8114af33>] mmu_notifier_unregister+0x23/0x130 [ 73.437017] RSP <ffff88008816bd50> [ 73.437704] CR2: 000000000000004c Fixes regression from commit ad46cb533d Author: Chris Wilson <chris@chris-wilson.co.uk> Date: Thu Aug 7 14:20:40 2014 +0100 drm/i915: Prevent recursive deadlock on releasing a busy userptr Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=84207 Testcase: igt/gem_render_copy_redux Testcase: igt/gem_userptr_blits/create-destroy-sync Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk> Cc: Jacek Danecki <jacek.danecki@intel.com> Cc: "Gong, Zhipeng" <zhipeng.gong@intel.com> Cc: Jacek Danecki <jacek.danecki@intel.com> Cc: "Ursulin, Tvrtko" <tvrtko.ursulin@intel.com> Cc: stable@vger.kernel.org Reviewed-by: Tvrtko Ursulin <tvrtko.ursulin@intel.com> Signed-off-by: Daniel Vetter <daniel.vetter@intel.com>		2014-09-29 15:19:59 +02:00
..
drm	drm/i915: Do not store the error pointer for a failed userptr registration	2014-09-29 15:19:59 +02:00
host1x	drm/tegra: Make job submission 64-bit safe	2014-08-04 10:07:36 +02:00
ipu-v3	gpu: ipu-v3: Add ipu_dump()	2014-09-02 14:55:56 +02:00
vga	vgaarb: We can own non-decoded resources	2014-07-08 11:15:09 +10:00
Makefile	gpu: ipu-v3: Move i.MX IPUv3 core driver out of staging	2014-06-04 11:06:52 +02:00