This is internal only patch, please send to internal mail list. -----Original Message----- From: amd-gfx [mailto:amd-gfx-bounces@xxxxxxxxxxxxxxxxxxxxx] On Behalf Of Junwei Zhang Sent: Friday, May 12, 2017 2:54 PM To: amd-gfx at lists.freedesktop.org Cc: Zhang, Jerry <Jerry.Zhang at amd.com> Subject: [PATCH] drm/amdgpu: fix sem list soft lockup issue sem should be delete from the previous sem list then add to the new sem list. If adding sem to the list which is same as previous one, it will cause endless loop when traverses the sem list. [ 264.133878] NMI watchdog: BUG: soft lockup - CPU#5 stuck for 22s! ... [ 264.133928] task: ffffa216ffbfbd00 task.stack: ffffa216f4220000 [ 264.133929] RIP: 0010:[<ffffffffc0584523>] [<ffffffffc0584523>] amdgpu_sem_put+0x13/0x30 [amdgpu] [ 264.133983] RSP: 0018:ffffa216f4223cb0 EFLAGS: 00200286 Signed-off-by: Junwei Zhang <Jerry.Zhang at amd.com> --- drivers/gpu/drm/amd/amdgpu/amdgpu_ctx.c | 4 +++- drivers/gpu/drm/amd/amdgpu/amdgpu_sem.c | 1 + 2 files changed, 4 insertions(+), 1 deletion(-) diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_ctx.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_ctx.c index ff20e11..aac43c8 100644 --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_ctx.c +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_ctx.c @@ -84,8 +84,10 @@ static void amdgpu_ctx_fini(struct amdgpu_ctx *ctx) mutex_lock(&ctx->rings[i].sem_lock); /* release all the reset inserted SEM here */ - list_for_each_entry_safe(sem, tmp, &ctx->rings[i].sem_list, list) + list_for_each_entry_safe(sem, tmp, &ctx->rings[i].sem_list, list) { + list_del_init(&sem->list); amdgpu_sem_put(sem); + } mutex_unlock(&ctx->rings[i].sem_lock); mutex_destroy(&ctx->rings[i].sem_lock); diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_sem.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_sem.c index 0302ea6..a7149ac 100644 --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_sem.c +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_sem.c @@ -371,6 +371,7 @@ static int amdgpu_sem_cring_add(struct amdgpu_fpriv *fpriv, if (r) goto err; mutex_lock(&ctx->rings[out_ring->idx].sem_lock); + list_del_init(&sem->list); list_add(&sem->list, &ctx->rings[out_ring->idx].sem_list); mutex_unlock(&ctx->rings[out_ring->idx].sem_lock); amdgpu_sem_get(sem); -- 1.9.1 _______________________________________________ amd-gfx mailing list amd-gfx at lists.freedesktop.org https://lists.freedesktop.org/mailman/listinfo/amd-gfx
