[PATCH] drm/i915/gvt: replace idr_init() by idr_init_base()

[PATCH] drm/i915/gvt: replace idr_init() by idr_init_base()

[Deepak R Varma]

idr_init() uses base 0 which is an invalid identifier. The new function
idr_init_base allows IDR to set the ID lookup from base 1. This avoids
all lookups that otherwise starts from 0 since 0 is always unused.

References: commit 6ce711f27500 ("idr: Make 1-based IDRs more efficient")

Signed-off-by: Deepak R Varma <mh12gx2825@gmail.com>
---
 drivers/gpu/drm/i915/gvt/gvt.c  | 2 +-
 drivers/gpu/drm/i915/gvt/vgpu.c | 2 +-
 2 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/gpu/drm/i915/gvt/gvt.c b/drivers/gpu/drm/i915/gvt/gvt.c
index c7c561237883..45b492edbb19 100644
--- a/drivers/gpu/drm/i915/gvt/gvt.c
+++ b/drivers/gpu/drm/i915/gvt/gvt.c
@@ -312,7 +312,7 @@ int intel_gvt_init_device(struct drm_i915_private *i915)
 
 	gvt_dbg_core("init gvt device\n");
 
-	idr_init(&gvt->vgpu_idr);
+	idr_init_base(&gvt->vgpu_idr, 1);
 	spin_lock_init(&gvt->scheduler.mmio_context_lock);
 	mutex_init(&gvt->lock);
 	mutex_init(&gvt->sched_lock);
diff --git a/drivers/gpu/drm/i915/gvt/vgpu.c b/drivers/gpu/drm/i915/gvt/vgpu.c
index f6d7e33c7099..1c8e63f84134 100644
--- a/drivers/gpu/drm/i915/gvt/vgpu.c
+++ b/drivers/gpu/drm/i915/gvt/vgpu.c
@@ -393,7 +393,7 @@ static struct intel_vgpu *__intel_gvt_create_vgpu(struct intel_gvt *gvt,
 	mutex_init(&vgpu->dmabuf_lock);
 	INIT_LIST_HEAD(&vgpu->dmabuf_obj_list_head);
 	INIT_RADIX_TREE(&vgpu->page_track_tree, GFP_KERNEL);
-	idr_init(&vgpu->object_idr);
+	idr_init_base(&vgpu->object_idr, 1);
 	intel_vgpu_init_cfg_space(vgpu, param->primary);
 	vgpu->d3_entered = false;
 
-- 
2.25.1

Re: [PATCH] drm/i915/gvt: replace idr_init() by idr_init_base()

[Zhenyu Wang]

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On 2020.11.04 17:45:32 +0530, Deepak R Varma wrote:
> idr_init() uses base 0 which is an invalid identifier. The new function
> idr_init_base allows IDR to set the ID lookup from base 1. This avoids
> all lookups that otherwise starts from 0 since 0 is always unused.
> 
> References: commit 6ce711f27500 ("idr: Make 1-based IDRs more efficient")
> 
> Signed-off-by: Deepak R Varma <mh12gx2825@gmail.com>
> ---
>  drivers/gpu/drm/i915/gvt/gvt.c  | 2 +-
>  drivers/gpu/drm/i915/gvt/vgpu.c | 2 +-
>  2 files changed, 2 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/gpu/drm/i915/gvt/gvt.c b/drivers/gpu/drm/i915/gvt/gvt.c
> index c7c561237883..45b492edbb19 100644
> --- a/drivers/gpu/drm/i915/gvt/gvt.c
> +++ b/drivers/gpu/drm/i915/gvt/gvt.c
> @@ -312,7 +312,7 @@ int intel_gvt_init_device(struct drm_i915_private *i915)
>  
>  	gvt_dbg_core("init gvt device\n");
>  
> -	idr_init(&gvt->vgpu_idr);
> +	idr_init_base(&gvt->vgpu_idr, 1);
>  	spin_lock_init(&gvt->scheduler.mmio_context_lock);
>  	mutex_init(&gvt->lock);
>  	mutex_init(&gvt->sched_lock);
> diff --git a/drivers/gpu/drm/i915/gvt/vgpu.c b/drivers/gpu/drm/i915/gvt/vgpu.c
> index f6d7e33c7099..1c8e63f84134 100644
> --- a/drivers/gpu/drm/i915/gvt/vgpu.c
> +++ b/drivers/gpu/drm/i915/gvt/vgpu.c
> @@ -393,7 +393,7 @@ static struct intel_vgpu *__intel_gvt_create_vgpu(struct intel_gvt *gvt,
>  	mutex_init(&vgpu->dmabuf_lock);
>  	INIT_LIST_HEAD(&vgpu->dmabuf_obj_list_head);
>  	INIT_RADIX_TREE(&vgpu->page_track_tree, GFP_KERNEL);
> -	idr_init(&vgpu->object_idr);
> +	idr_init_base(&vgpu->object_idr, 1);
>  	intel_vgpu_init_cfg_space(vgpu, param->primary);
>  	vgpu->d3_entered = false;
>  
> -- 

Looks good to me. Thanks!

Reviewed-by: Zhenyu Wang <zhenyuw@linux.intel.com>

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