[1/3] drm/dp: Use non-cyclic idr
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Message ID 1555977388-14203-1-git-send-email-sunpeng.li@amd.com
State New
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  • [1/3] drm/dp: Use non-cyclic idr
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Commit Message

Leo April 22, 2019, 11:56 p.m. UTC
From: Leo Li <sunpeng.li@amd.com>

In preparation for adding aux devices for DP MST, make the IDR
non-cyclic. That way, hotplug cycling MST devices won't needlessly
increment the minor version index.

Signed-off-by: Leo Li <sunpeng.li@amd.com>
---
 drivers/gpu/drm/drm_dp_aux_dev.c | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

Comments

Ville Syrjälä April 23, 2019, 2:49 p.m. UTC | #1
On Mon, Apr 22, 2019 at 07:56:26PM -0400, sunpeng.li@amd.com wrote:
> From: Leo Li <sunpeng.li@amd.com>
> 
> In preparation for adding aux devices for DP MST, make the IDR
> non-cyclic. That way, hotplug cycling MST devices won't needlessly
> increment the minor version index.
> 
> Signed-off-by: Leo Li <sunpeng.li@amd.com>

I don't recall any specific reason for the cyclic variant, so
Reviewed-by: Ville Syrjälä <ville.syrjala@linux.intel.com>

> ---
>  drivers/gpu/drm/drm_dp_aux_dev.c | 3 +--
>  1 file changed, 1 insertion(+), 2 deletions(-)
> 
> diff --git a/drivers/gpu/drm/drm_dp_aux_dev.c b/drivers/gpu/drm/drm_dp_aux_dev.c
> index 0e4f25d..6d84611 100644
> --- a/drivers/gpu/drm/drm_dp_aux_dev.c
> +++ b/drivers/gpu/drm/drm_dp_aux_dev.c
> @@ -80,8 +80,7 @@ static struct drm_dp_aux_dev *alloc_drm_dp_aux_dev(struct drm_dp_aux *aux)
>  	kref_init(&aux_dev->refcount);
>  
>  	mutex_lock(&aux_idr_mutex);
> -	index = idr_alloc_cyclic(&aux_idr, aux_dev, 0, DRM_AUX_MINORS,
> -				 GFP_KERNEL);
> +	index = idr_alloc(&aux_idr, aux_dev, 0, DRM_AUX_MINORS, GFP_KERNEL);
>  	mutex_unlock(&aux_idr_mutex);
>  	if (index < 0) {
>  		kfree(aux_dev);
> -- 
> 2.7.4
Lyude Paul April 24, 2019, 5:25 p.m. UTC | #2
lgtm

Reviewed-by: Lyude Paul <lyude@redhat.com>

On Mon, 2019-04-22 at 19:56 -0400, sunpeng.li@amd.com wrote:
> From: Leo Li <sunpeng.li@amd.com>
> 
> In preparation for adding aux devices for DP MST, make the IDR
> non-cyclic. That way, hotplug cycling MST devices won't needlessly
> increment the minor version index.
> 
> Signed-off-by: Leo Li <sunpeng.li@amd.com>
> ---
>  drivers/gpu/drm/drm_dp_aux_dev.c | 3 +--
>  1 file changed, 1 insertion(+), 2 deletions(-)
> 
> diff --git a/drivers/gpu/drm/drm_dp_aux_dev.c
> b/drivers/gpu/drm/drm_dp_aux_dev.c
> index 0e4f25d..6d84611 100644
> --- a/drivers/gpu/drm/drm_dp_aux_dev.c
> +++ b/drivers/gpu/drm/drm_dp_aux_dev.c
> @@ -80,8 +80,7 @@ static struct drm_dp_aux_dev *alloc_drm_dp_aux_dev(struct
> drm_dp_aux *aux)
>  	kref_init(&aux_dev->refcount);
>  
>  	mutex_lock(&aux_idr_mutex);
> -	index = idr_alloc_cyclic(&aux_idr, aux_dev, 0, DRM_AUX_MINORS,
> -				 GFP_KERNEL);
> +	index = idr_alloc(&aux_idr, aux_dev, 0, DRM_AUX_MINORS, GFP_KERNEL);
>  	mutex_unlock(&aux_idr_mutex);
>  	if (index < 0) {
>  		kfree(aux_dev);

Patch
diff mbox series

diff --git a/drivers/gpu/drm/drm_dp_aux_dev.c b/drivers/gpu/drm/drm_dp_aux_dev.c
index 0e4f25d..6d84611 100644
--- a/drivers/gpu/drm/drm_dp_aux_dev.c
+++ b/drivers/gpu/drm/drm_dp_aux_dev.c
@@ -80,8 +80,7 @@  static struct drm_dp_aux_dev *alloc_drm_dp_aux_dev(struct drm_dp_aux *aux)
 	kref_init(&aux_dev->refcount);
 
 	mutex_lock(&aux_idr_mutex);
-	index = idr_alloc_cyclic(&aux_idr, aux_dev, 0, DRM_AUX_MINORS,
-				 GFP_KERNEL);
+	index = idr_alloc(&aux_idr, aux_dev, 0, DRM_AUX_MINORS, GFP_KERNEL);
 	mutex_unlock(&aux_idr_mutex);
 	if (index < 0) {
 		kfree(aux_dev);