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drm/i915/perf: ensure we keep a reference on the driver

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The i915 perf stream has its own file descriptor and is tied to
reference of the driver. We haven't taken care of keep the driver
alive.

Signed-off-by: Lionel Landwerlin <lionel.g.landwerlin@intel.com>
Suggested-by: Chris Wilson <chris@chris-wilson.co.uk>
Fixes: eec688e142 ("drm/i915: Add i915 perf infrastructure")
Reviewed-by: Chris Wilson <chris@chris-wilson.co.uk>
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Link: https://patchwork.freedesktop.org/patch/msgid/20190709123351.5645-2-lionel.g.landwerlin@intel.com
This commit is contained in:
Lionel Landwerlin 2019-07-09 15:33:39 +03:00 committed by Chris Wilson
parent 681c774d34
commit a5af1df716
1 changed files with 8 additions and 0 deletions
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8
drivers/gpu/drm/i915/i915_perf.c
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@ -2517,6 +2517,9 @@ static int i915_perf_release(struct inode *inode, struct file *file)
i915_perf_destroy_locked(stream);
mutex_unlock(&dev_priv->perf.lock);
/* Release the reference the perf stream kept on the driver. */
drm_dev_put(&dev_priv->drm);
return 0;
}
@ -2652,6 +2655,11 @@ i915_perf_open_ioctl_locked(struct drm_i915_private *dev_priv,
if (!(param->flags & I915_PERF_FLAG_DISABLED))
i915_perf_enable_locked(stream);
/* Take a reference on the driver that will be kept with stream_fd
* until its release.
*/
drm_dev_get(&dev_priv->drm);
return stream_fd;
err_open: