target/linux/bcm27xx/patches-5.10/950-0691-drm-vc4-replace-idr_init-by-idr_init_base.patch

   1 From b19ef92e9e95765bab9b952aa781363fe2917254 Mon Sep 17 00:00:00 2001
   2 From: Deepak R Varma <mh12gx2825@gmail.com>
   3 Date: Fri, 6 Nov 2020 01:51:35 +0530
   4 Subject: [PATCH] drm/vc4: replace idr_init() by idr_init_base()
   5
   6 idr_init() uses base 0 which is an invalid identifier for this driver.
   7 The idr_alloc for this driver uses VC4_PERFMONID_MIN as start value for
   8 ID range and it is #defined to 1. The new function idr_init_base allows
   9 IDR to set the ID lookup from base 1. This avoids all lookups that
  10 otherwise starts from 0 since 0 is always unused / available.
  11
  12 References: commit 6ce711f27500 ("idr: Make 1-based IDRs more efficient")
  13
  14 Signed-off-by: Deepak R Varma <mh12gx2825@gmail.com>
  15 Reviewed-by: Eric Anholt <eric@anholt.net>
  16 Signed-off-by: Maxime Ripard <maxime@cerno.tech>
  17 Link: https://patchwork.freedesktop.org/patch/msgid/20201105202135.GA145111@localhost
  18 ---
  19  drivers/gpu/drm/vc4/vc4_perfmon.c | 2 +-
  20  1 file changed, 1 insertion(+), 1 deletion(-)
  21
  22 --- a/drivers/gpu/drm/vc4/vc4_perfmon.c
  23 +++ b/drivers/gpu/drm/vc4/vc4_perfmon.c
  24 @@ -77,7 +77,7 @@ struct vc4_perfmon *vc4_perfmon_find(str
  25  void vc4_perfmon_open_file(struct vc4_file *vc4file)
  26  {
  27         mutex_init(&vc4file->perfmon.lock);
  28 -       idr_init(&vc4file->perfmon.idr);
  29 +       idr_init_base(&vc4file->perfmon.idr, VC4_PERFMONID_MIN);
  30  }
  31
  32  static int vc4_perfmon_idr_del(int id, void *elem, void *data)