From: Deepak R Varma <mh12gx2825@gmail.com>
Date: Thu, 5 Nov 2020 17:36:46 +0000 (+0530)
Subject: drm/vgem: replace idr_init() by idr_init_base()
X-Git-Tag: v5.15~303^2~28^2~1449
X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=05854d482a5fe6a497be2e134805cb188a9ea361;p=platform%2Fkernel%2Flinux-starfive.git

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@gmail.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Link: https://patchwork.freedesktop.org/patch/msgid/20201105173646.GA41732@localhost
---

diff --git a/drivers/gpu/drm/vgem/vgem_fence.c b/drivers/gpu/drm/vgem/vgem_fence.c
index 17f32f55..2902dc6 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;
 }