* [PATCH] drm/stm: Fix runtime PM leak in ltdc_crtc_mode_set_nofb()
@ 2026-09-16 18:21 Wentao Liang
0 siblings, 0 replies; only message in thread
From: Wentao Liang @ 2026-09-16 18:21 UTC (permalink / raw)
To: airlied
Cc: alexandre.torgue, benjamin.gaignard, dri-devel, linux-arm-kernel,
linux-kernel, linux-stm32, maarten.lankhorst, mcoquelin.stm32,
mripard, philippe.cornu, raphael.gallais-pou, simona, tzimmermann,
yannick.fertre, yannick.fertre, Wentao Liang, stable
pm_runtime_get_sync() increments the usage counter even when it fails,
so the early return on a failed resume leaves the counter elevated
forever. Drop it again with pm_runtime_put_noidle() on that path.
Fixes: 35ab6cfbf211 ("drm/stm: support runtime power management")
Cc: stable@vger.kernel.org
Signed-off-by: Wentao Liang <vulab@iscas.ac.cn>
---
drivers/gpu/drm/stm/ltdc.c | 1 +
1 file changed, 1 insertion(+)
diff --git a/drivers/gpu/drm/stm/ltdc.c b/drivers/gpu/drm/stm/ltdc.c
index f7e847cfa38f..a95ca3c3df76 100644
--- a/drivers/gpu/drm/stm/ltdc.c
+++ b/drivers/gpu/drm/stm/ltdc.c
@@ -945,6 +945,7 @@ static void ltdc_crtc_mode_set_nofb(struct drm_crtc *crtc)
ret = pm_runtime_get_sync(ddev->dev);
if (ret) {
drm_err(crtc->dev, "Failed to set mode, cannot get sync\n");
+ pm_runtime_put_noidle(ddev->dev);
return;
}
}
--
2.34.1
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