| From | Greg Kroah-Hartman <> | Subject | [PATCH 5.4 075/191] drm/amdgpu/smu: add metrics table lock for vega20 (v2) | Date | Tue, 7 Jan 2020 21:53:15 +0100 |
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From: Alex Deucher <alexander.deucher@amd.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@amd.com> Reviewed-by: Evan Quan <evan.quan@amd.com> Signed-off-by: Alex Deucher <alexander.deucher@amd.com> Cc: stable@vger.kernel.org Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.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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