[Bug 71029] igt/gem_close_race fails

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=71029

--- Comment #2 from lu hua <huax.lu at intel.com> ---
Test on latest -nightly kernel.
It works well on sandybridge, ivybridge and haswell.

It causes call trace on ironlake, and it doesn't exit test.
output:
Subtest process-exit: SUCCESS
Call Trace:
[  962.964724]  [<ffffffffa0077091>] ? i915_gem_retire_requests_ring+0x3a/0x8e
[i915]
[  962.964777]  [<ffffffffa0077c96>] ? i915_gem_busy_ioctl+0x63/0xbb [i915]
[  962.964825]  [<ffffffffa0009f94>] ? drm_ioctl+0x26c/0x38d [drm]
[  962.964868]  [<ffffffffa0077c33>] ? i915_gem_set_seqno+0x4a/0x4a [i915]
[  962.964913]  [<ffffffff8104be83>] ? hrtimer_try_to_cancel+0x67/0x70
[  962.964954]  [<ffffffff810e84ae>] ? vfs_ioctl+0x1e/0x31
[  962.964988]  [<ffffffff810e8c84>] ? do_vfs_ioctl+0x3ad/0x3ef
[  962.965026]  [<ffffffff81074d75>] ? SyS_futex+0x12e/0x161
[  962.965060]  [<ffffffff810e8d14>] ? SyS_ioctl+0x4e/0x7e
[  962.965095]  [<ffffffff8170ebe2>] ? system_call_fastpath+0x16/0x1b
[  962.965133] Code: 8b 6b 40 48 89 7b 30 4c 89 43 38 48 85 ed 74 40 48 8d 7d
08 e8 44 3c 69 e1 48 8b 53 48 48 8b 43 50 48 b9 00 02 20 00 00 00 ad de <48> 89
42 08 48 89 10 48 ba 00 01 10 00 00 00 ad de 48 89 53 48
[  962.965413] RIP  [<ffffffffa0075cff>] i915_gem_free_request+0x55/0x9e [i915]
[  962.965462]  RSP <ffff88009e2b5d48>

Also test the comment 1 patch, It has same result as the latest kernel.

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