Re: [PATCH v5 6/6] drm/qxl: simplify qxl_fence_wait

[kernel test robot]

Hi Gerd,

I love your patch! Perhaps something to improve:

[auto build test WARNING on drm-intel/for-linux-next]
[also build test WARNING on drm-tip/drm-tip drm-exynos/exynos-drm-next tegra-drm/drm/tegra/for-next linus/master v5.11-rc6 next-20210125]
[cannot apply to drm/drm-next]
[If your patch is applied to the wrong git tree, kindly drop us a note.
And when submitting patch, we suggest to use '--base' as documented in
https://git-scm.com/docs/git-format-patch]

url:    https://github.com/0day-ci/linux/commits/Gerd-Hoffmann/drm-qxl-fix-driver-shutdown-issues/20210203-211739
base:   git://anongit.freedesktop.org/drm-intel for-linux-next
config: i386-randconfig-a013-20210202 (attached as .config)
compiler: gcc-9 (Debian 9.3.0-15) 9.3.0
reproduce (this is a W=1 build):
        # https://github.com/0day-ci/linux/commit/0b11c8d52de8c79900ab632aa3527f19c442efc6
        git remote add linux-review https://github.com/0day-ci/linux
        git fetch --no-tags linux-review Gerd-Hoffmann/drm-qxl-fix-driver-shutdown-issues/20210203-211739
        git checkout 0b11c8d52de8c79900ab632aa3527f19c442efc6
        # save the attached .config to linux build tree
        make W=1 ARCH=i386 

If you fix the issue, kindly add following tag as appropriate
Reported-by: kernel test robot <lkp@xxxxxxxxx>

All warnings (new ones prefixed by >>):

   drivers/gpu/drm/qxl/qxl_release.c: In function 'qxl_fence_wait':
>> drivers/gpu/drm/qxl/qxl_release.c:61:22: warning: variable 'release' set but not used [-Wunused-but-set-variable]
      61 |  struct qxl_release *release;
         |                      ^~~~~~~


vim +/release +61 drivers/gpu/drm/qxl/qxl_release.c

2f453ed4038526 Maarten Lankhorst 2014-04-02  56  
f54d1867005c33 Chris Wilson      2016-10-25  57  static long qxl_fence_wait(struct dma_fence *fence, bool intr,
f54d1867005c33 Chris Wilson      2016-10-25  58  			   signed long timeout)
2f453ed4038526 Maarten Lankhorst 2014-04-02  59  {
2f453ed4038526 Maarten Lankhorst 2014-04-02  60  	struct qxl_device *qdev;
2f453ed4038526 Maarten Lankhorst 2014-04-02 @61  	struct qxl_release *release;
2f453ed4038526 Maarten Lankhorst 2014-04-02  62  	unsigned long cur, end = jiffies + timeout;
2f453ed4038526 Maarten Lankhorst 2014-04-02  63  
2f453ed4038526 Maarten Lankhorst 2014-04-02  64  	qdev = container_of(fence->lock, struct qxl_device, release_lock);
2f453ed4038526 Maarten Lankhorst 2014-04-02  65  	release = container_of(fence, struct qxl_release, base);
2f453ed4038526 Maarten Lankhorst 2014-04-02  66  
f54d1867005c33 Chris Wilson      2016-10-25  67  	if (dma_fence_is_signaled(fence))
2f453ed4038526 Maarten Lankhorst 2014-04-02  68  		goto signaled;
2f453ed4038526 Maarten Lankhorst 2014-04-02  69  
2f453ed4038526 Maarten Lankhorst 2014-04-02  70  	qxl_io_notify_oom(qdev);
0b11c8d52de8c7 Gerd Hoffmann     2021-02-03  71  	if (!wait_event_timeout(qdev->release_event,
0b11c8d52de8c7 Gerd Hoffmann     2021-02-03  72  				dma_fence_is_signaled(fence),
0b11c8d52de8c7 Gerd Hoffmann     2021-02-03  73  				timeout))
2f453ed4038526 Maarten Lankhorst 2014-04-02  74  		return 0;
2f453ed4038526 Maarten Lankhorst 2014-04-02  75  
2f453ed4038526 Maarten Lankhorst 2014-04-02  76  signaled:
2f453ed4038526 Maarten Lankhorst 2014-04-02  77  	cur = jiffies;
2f453ed4038526 Maarten Lankhorst 2014-04-02  78  	if (time_after(cur, end))
2f453ed4038526 Maarten Lankhorst 2014-04-02  79  		return 0;
2f453ed4038526 Maarten Lankhorst 2014-04-02  80  	return end - cur;
2f453ed4038526 Maarten Lankhorst 2014-04-02  81  }
2f453ed4038526 Maarten Lankhorst 2014-04-02  82  

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