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drm/i915: prevent crash with .disable_display parameter

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commit 27892bbdc9 upstream.

The .disable_display parameter was causing a fatal crash when fbdev
was dereferenced during driver init.

V1: protection in i915_drv.c
V2: Moved protection to intel_fbdev.c

Fixes: 43cee31434 ("drm/i915/fbdev: Limit the global async-domain synchronization")
Testcase: igt/drv_module_reload/basic-no-display
Cc: Chris Wilson <chris@chris-wilson.co.uk>
Signed-off-by: Clint Taylor <clinton.a.taylor@intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/1484775523-29428-1-git-send-email-clinton.a.taylor@intel.com
Reviewed-by: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Lukas Wunner <lukas@wunner.de>
Cc: Daniel Vetter <daniel.vetter@ffwll.ch>
Cc: Jani Nikula <jani.nikula@linux.intel.com>
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
(cherry picked from commit 5b8cd0755f)
Signed-off-by: Jani Nikula <jani.nikula@intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Clint Taylor
2017-01-18 13:38:43 -08:00
committed by Greg Kroah-Hartman
parent 9913aca2d5
commit 2cff678d0b
1 changed files with 3 additions and 0 deletions
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3
drivers/gpu/drm/i915/intel_fbdev.c
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@@ -745,6 +745,9 @@ void intel_fbdev_initial_config_async(struct drm_device *dev)
{
struct intel_fbdev *ifbdev = to_i915(dev)->fbdev;
if (!ifbdev)
return;
ifbdev->cookie = async_schedule(intel_fbdev_initial_config, ifbdev);
}