From 1c455101c6d10c99b310d6bcf613244c97854012 Mon Sep 17 00:00:00 2001 From: Alex Deucher Date: Tue, 17 Dec 2019 09:51:40 -0500 Subject: [PATCH] drm/amdgpu/smu: add metrics table lock for vega20 (v2) To protect access to the metrics table. v2: unlock on error Bug: https://gitlab.freedesktop.org/drm/amd/issues/900 Reviewed-by: Kevin Wang Reviewed-by: Evan Quan Signed-off-by: Alex Deucher Cc: stable@vger.kernel.org --- drivers/gpu/drm/amd/powerplay/vega20_ppt.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/drivers/gpu/drm/amd/powerplay/vega20_ppt.c b/drivers/gpu/drm/amd/powerplay/vega20_ppt.c index 60b9ff097142..0d3a3b0a934e 100644 --- a/drivers/gpu/drm/amd/powerplay/vega20_ppt.c +++ b/drivers/gpu/drm/amd/powerplay/vega20_ppt.c @@ -1678,17 +1678,20 @@ static int vega20_get_metrics_table(struct smu_context *smu, struct smu_table_context *smu_table= &smu->smu_table; int ret = 0; + mutex_lock(&smu->metrics_lock); if (!smu_table->metrics_time || time_after(jiffies, smu_table->metrics_time + HZ / 1000)) { ret = smu_update_table(smu, SMU_TABLE_SMU_METRICS, 0, (void *)smu_table->metrics_table, false); if (ret) { pr_info("Failed to export SMU metrics table!\n"); + mutex_unlock(&smu->metrics_lock); return ret; } smu_table->metrics_time = jiffies; } memcpy(metrics_table, smu_table->metrics_table, sizeof(SmuMetrics_t)); + mutex_unlock(&smu->metrics_lock); return ret; }