2020-11-04 12:17:37

by Deepak R Varma

[permalink] [raw]

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

---

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 <[email protected]>
---
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

2020-11-11 02:32:11

by Zhenyu Wang

[permalink] [raw]

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

---

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 <[email protected]>
> ---
> 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 <[email protected]>

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