[PATCH v2 5/6] drm/msm/a6xx: Drop the device reference in gmu

[Jordan Crouse]

On Thu, May 23, 2019 at 01:16:44PM -0400, Sean Paul wrote:
> From: Sean Paul <seanpaul at chromium.org>
> 
> of_find_device_by_node() grabs a dev reference, so make sure we clear it
> on error and remove.
> 
> Changes in v2:
> - Added to the set (Jordan)
> 
> Cc: Jordan Crouse <jcrouse at codeaurora.org>
> Signed-off-by: Sean Paul <seanpaul at chromium.org>

Reviewed-by: Jordan Crouse <jcrouse at codeaurora.org>
> ---
>  drivers/gpu/drm/msm/adreno/a6xx_gmu.c | 14 +++++++++++---
>  1 file changed, 11 insertions(+), 3 deletions(-)
> 
> diff --git a/drivers/gpu/drm/msm/adreno/a6xx_gmu.c b/drivers/gpu/drm/msm/adreno/a6xx_gmu.c
> index f7240c9e11fb..e2b839b5d3bd 100644
> --- a/drivers/gpu/drm/msm/adreno/a6xx_gmu.c
> +++ b/drivers/gpu/drm/msm/adreno/a6xx_gmu.c
> @@ -1253,6 +1253,9 @@ void a6xx_gmu_remove(struct a6xx_gpu *a6xx_gpu)
>  	free_irq(gmu->gmu_irq, gmu);
>  	free_irq(gmu->hfi_irq, gmu);
>  
> +	/* Drop reference taken in of_find_device_by_node */
> +	put_device(gmu->dev);
> +
>  	gmu->initialized = false;
>  }
>  
> @@ -1277,12 +1280,12 @@ int a6xx_gmu_probe(struct a6xx_gpu *a6xx_gpu, struct device_node *node)
>  	/* Get the list of clocks */
>  	ret = a6xx_gmu_clocks_probe(gmu);
>  	if (ret)
> -		return ret;
> +		goto err_put_device;
>  
>  	/* Set up the IOMMU context bank */
>  	ret = a6xx_gmu_memory_probe(gmu);
>  	if (ret)
> -		return ret;
> +		goto err_put_device;
>  
>  	/* Allocate memory for for the HFI queues */
>  	gmu->hfi = a6xx_gmu_memory_alloc(gmu, SZ_16K);
> @@ -1334,6 +1337,11 @@ int a6xx_gmu_probe(struct a6xx_gpu *a6xx_gpu, struct device_node *node)
>  
>  		iommu_domain_free(gmu->domain);
>  	}
> +	ret = -ENODEV;
>  
> -	return -ENODEV;
> +err_put_device:
> +	/* Drop reference taken in of_find_device_by_node */
> +	put_device(gmu->dev);
> +
> +	return ret;
>  }
> -- 
> Sean Paul, Software Engineer, Google / Chromium OS
> 

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