diff options
Diffstat (limited to 'target/linux/bcm27xx/patches-5.10/950-0691-drm-vc4-replace-idr_init-by-idr_init_base.patch')
| -rw-r--r-- | target/linux/bcm27xx/patches-5.10/950-0691-drm-vc4-replace-idr_init-by-idr_init_base.patch | 32 |
1 files changed, 32 insertions, 0 deletions
diff --git a/target/linux/bcm27xx/patches-5.10/950-0691-drm-vc4-replace-idr_init-by-idr_init_base.patch b/target/linux/bcm27xx/patches-5.10/950-0691-drm-vc4-replace-idr_init-by-idr_init_base.patch new file mode 100644 index 0000000000..2e9a8483a5 --- /dev/null +++ b/target/linux/bcm27xx/patches-5.10/950-0691-drm-vc4-replace-idr_init-by-idr_init_base.patch @@ -0,0 +1,32 @@ +From b19ef92e9e95765bab9b952aa781363fe2917254 Mon Sep 17 00:00:00 2001 +From: Deepak R Varma <mh12gx2825@gmail.com> +Date: Fri, 6 Nov 2020 01:51:35 +0530 +Subject: [PATCH] drm/vc4: replace idr_init() by idr_init_base() + +idr_init() uses base 0 which is an invalid identifier for this driver. +The idr_alloc for this driver uses VC4_PERFMONID_MIN as start value for +ID range and it is #defined to 1. 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 / available. + +References: commit 6ce711f27500 ("idr: Make 1-based IDRs more efficient") + +Signed-off-by: Deepak R Varma <mh12gx2825@gmail.com> +Reviewed-by: Eric Anholt <eric@anholt.net> +Signed-off-by: Maxime Ripard <maxime@cerno.tech> +Link: https://patchwork.freedesktop.org/patch/msgid/20201105202135.GA145111@localhost +--- + drivers/gpu/drm/vc4/vc4_perfmon.c | 2 +- + 1 file changed, 1 insertion(+), 1 deletion(-) + +--- a/drivers/gpu/drm/vc4/vc4_perfmon.c ++++ b/drivers/gpu/drm/vc4/vc4_perfmon.c +@@ -77,7 +77,7 @@ struct vc4_perfmon *vc4_perfmon_find(str + void vc4_perfmon_open_file(struct vc4_file *vc4file) + { + mutex_init(&vc4file->perfmon.lock); +- idr_init(&vc4file->perfmon.idr); ++ idr_init_base(&vc4file->perfmon.idr, VC4_PERFMONID_MIN); + } + + static int vc4_perfmon_idr_del(int id, void *elem, void *data) |