linux-kernel - [PATCH v2] drm/vgem: replace idr_init() by idr_init

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Date:   Thu, 5 Nov 2020 23:06:46 +0530
From:   Deepak R Varma <mh12gx2825@...il.com>
To:     David Airlie <airlied@...ux.ie>, Daniel Vetter <daniel@...ll.ch>,
        dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org
Cc:     mh12gx2825@...il.com, intel-gfx@...ts.freedesktop.org
Subject: [PATCH v2] drm/vgem: 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 <mh12gx2825@...il.com>
---
Changes since v1:
   - Changes suggested by Daniel Vetter:
     1. Correct typo in patch summary
     2. cc intel-gfx to get the patch through CI bot test

 drivers/gpu/drm/vgem/vgem_fence.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/vgem/vgem_fence.c b/drivers/gpu/drm/vgem/vgem_fence.c
index 17f32f550dd9..2902dc6e64fa 100644
--- a/drivers/gpu/drm/vgem/vgem_fence.c
+++ b/drivers/gpu/drm/vgem/vgem_fence.c
@@ -233,7 +233,7 @@ int vgem_fence_signal_ioctl(struct drm_device *dev,
 int vgem_fence_open(struct vgem_file *vfile)
 {
 	mutex_init(&vfile->fence_mutex);
-	idr_init(&vfile->fence_idr);
+	idr_init_base(&vfile->fence_idr, 1);
 
 	return 0;
 }
-- 
2.25.1