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Message-ID: <f889f994-d2cd-fedc-8c95-9c8501037809@amd.com>
Date: Wed, 26 Apr 2023 13:05:33 +0200
From: Christian König <christian.koenig@....com>
To: Chia-I Wu <olvaffe@...il.com>, dri-devel@...ts.freedesktop.org
Cc: stable@...r.kernel.org, Alex Deucher <alexander.deucher@....com>,
"Pan, Xinhui" <Xinhui.Pan@....com>,
David Airlie <airlied@...il.com>,
Daniel Vetter <daniel@...ll.ch>, amd-gfx@...ts.freedesktop.org,
linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2] drm/amdgpu: add a missing lock for AMDGPU_SCHED
Am 26.04.23 um 08:17 schrieb Chia-I Wu:
> mgr->ctx_handles should be protected by mgr->lock.
>
> v2: improve commit message
>
> Signed-off-by: Chia-I Wu <olvaffe@...il.com>
> Cc: stable@...r.kernel.org
Please don't manually CC stable@...r.kernel.org while sending patches
out, let us maintainers push that upstream with the appropriate tag and
Greg picking it up from there.
A Fixes tag and figuring out to which stable versions this needs to be
backported are nice to have as well, but Alex and I can take care of
that as well.
Apart from that the technical side of the patch is Reviewed-by:
Christian König <christian.koenig@....com>.
Regards,
Christian.
> ---
> drivers/gpu/drm/amd/amdgpu/amdgpu_sched.c | 6 +++++-
> 1 file changed, 5 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_sched.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_sched.c
> index e9b45089a28a6..863b2a34b2d64 100644
> --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_sched.c
> +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_sched.c
> @@ -38,6 +38,7 @@ static int amdgpu_sched_process_priority_override(struct amdgpu_device *adev,
> {
> struct fd f = fdget(fd);
> struct amdgpu_fpriv *fpriv;
> + struct amdgpu_ctx_mgr *mgr;
> struct amdgpu_ctx *ctx;
> uint32_t id;
> int r;
> @@ -51,8 +52,11 @@ static int amdgpu_sched_process_priority_override(struct amdgpu_device *adev,
> return r;
> }
>
> - idr_for_each_entry(&fpriv->ctx_mgr.ctx_handles, ctx, id)
> + mgr = &fpriv->ctx_mgr;
> + mutex_lock(&mgr->lock);
> + idr_for_each_entry(&mgr->ctx_handles, ctx, id)
> amdgpu_ctx_priority_override(ctx, priority);
> + mutex_unlock(&mgr->lock);
>
> fdput(f);
> return 0;
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