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Date: Tue, 7 Jan 2020 21:53:15 +0100 From: Greg Kroah-Hartman <gregkh@...uxfoundation.org> To: linux-kernel@...r.kernel.org Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>, stable@...r.kernel.org, Kevin Wang <kevin1.wang@....com>, Evan Quan <evan.quan@....com>, Alex Deucher <alexander.deucher@....com> Subject: [PATCH 5.4 075/191] drm/amdgpu/smu: add metrics table lock for vega20 (v2) From: Alex Deucher <alexander.deucher@....com> commit 1c455101c6d10c99b310d6bcf613244c97854012 upstream. To protect access to the metrics table. v2: unlock on error Bug: https://gitlab.freedesktop.org/drm/amd/issues/900 Reviewed-by: Kevin Wang <kevin1.wang@....com> Reviewed-by: Evan Quan <evan.quan@....com> Signed-off-by: Alex Deucher <alexander.deucher@....com> Cc: stable@...r.kernel.org Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org> --- drivers/gpu/drm/amd/powerplay/vega20_ppt.c | 3 +++ 1 file changed, 3 insertions(+) --- a/drivers/gpu/drm/amd/powerplay/vega20_ppt.c +++ b/drivers/gpu/drm/amd/powerplay/vega20_ppt.c @@ -1691,17 +1691,20 @@ static int vega20_get_metrics_table(stru 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; }
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