[Bug 87094] New: [HSW/BYT]igt/drm_read subcases short-buffer-block and short-buffer-nonblock fail

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=87094

            Bug ID: 87094
           Summary: [HSW/BYT]igt/drm_read subcases short-buffer-block and
                    short-buffer-nonblock fail
           Product: DRI
           Version: DRI git
          Hardware: Other
                OS: All
            Status: NEW
          Severity: normal
          Priority: medium
         Component: DRM/Intel
          Assignee: intel-gfx-bugs at lists.freedesktop.org
          Reporter: jinxianx.guo at intel.com
        QA Contact: intel-gfx-bugs at lists.freedesktop.org
                CC: intel-gfx-bugs at lists.freedesktop.org

Created attachment 110560
  --> https://bugs.freedesktop.org/attachment.cgi?id=110560&action=edit
dmesg

==System Environment==
--------------------------
Regression: No
They are new cases

Non-working platforms: HSW BYT

==kernel==
--------------------------
origin/drm-intel-nightly: 2014_12_08(fails)
origin/drm-intel-next-queued: bcfcc8ba29c933ee98c7f498ee7ccfa17be400dd(fails)
    drm/i915: Additional request structure tracing  
origin/drm-intel-fixes: 9cca30688043eb1b6569f794041dfeec218dffa5(works)
    drm/i915: Handle inaccurate time conversion issues

==Bug detailed description==
-----------------------------
igt/drm_read subcases short-buffer-block and short-buffer-nonblock fail

Output:
[root at x-hsw24 tests]# ./drm_read --run-subtest short-buffer-block 
IGT-Version: 1.8-g819e68f (x86_64) (Linux:
3.18.0-rc7_drm-intel-nightly_bfdd01_20141208+ x86_64) 
Test assertion failure function test_short_buffer, file drm_read.c:148: 
Failed assertion: read(fd, buffer, 4) == 0 
Last errno: 11, Resource temporarily unavailable 
error: -1 != 0 
Subtest short-buffer-block: FAIL (0.000s) 
[root at x-hsw24 tests]# ./drm_read --run-subtest short-buffer-nonblock 
IGT-Version: 1.8-g819e68f (x86_64) (Linux:
3.18.0-rc7_drm-intel-nightly_bfdd01_20141208+ x86_64) 
Test assertion failure function test_short_buffer, file drm_read.c:148: 
Failed assertion: read(fd, buffer, 4) == 0 
Last errno: 11, Resource temporarily unavailable 
error: -1 != 0 
Subtest short-buffer-nonblock: FAIL (0.000s) 


Reproduce steps:
-------------------------
1. ./drm_read --run-subtest short-buffer-block

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