[Intel-gfx] [PATCH] drm/i915/guc: Fix a warning message problem during driver unload

[Jani Nikula]

On Thu, 17 Dec 2015, yu.dai at intel.com wrote:
> From: Alex Dai <yu.dai at intel.com>
>
> The device struct_mutex needs to be held before releasing any GEM
> objects allocated by GuC.

This is indeed so, but your patch subject needs to say it fixes an
actual bug rather than a "warning message problem" which makes one think
it's benign.

Also, if you see a warning splat in dmesg, please include that in the
commit message when you fix it. It's *much* easier to match bug reports
with fixes when you have that.

BR,
Jani.


>
> Signed-off-by: Alex Dai <yu.dai at intel.com>
> ---
>  drivers/gpu/drm/i915/intel_guc_loader.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/drivers/gpu/drm/i915/intel_guc_loader.c b/drivers/gpu/drm/i915/intel_guc_loader.c
> index 625272f4..4748651 100644
> --- a/drivers/gpu/drm/i915/intel_guc_loader.c
> +++ b/drivers/gpu/drm/i915/intel_guc_loader.c
> @@ -631,10 +631,10 @@ void intel_guc_ucode_fini(struct drm_device *dev)
>  	struct drm_i915_private *dev_priv = dev->dev_private;
>  	struct intel_guc_fw *guc_fw = &dev_priv->guc.guc_fw;
>  
> +	mutex_lock(&dev->struct_mutex);
>  	direct_interrupts_to_host(dev_priv);
>  	i915_guc_submission_fini(dev);
>  
> -	mutex_lock(&dev->struct_mutex);
>  	if (guc_fw->guc_fw_obj)
>  		drm_gem_object_unreference(&guc_fw->guc_fw_obj->base);
>  	guc_fw->guc_fw_obj = NULL;

-- 
Jani Nikula, Intel Open Source Technology Center