[PATCH v3 02/13] drm/panfrost: Prevent division by 0

[Adrián Larumbe]

When updating and debug-printing devfreq stats, in the very unlikely
offchance that total device time is less than 100 ns, clamp it to 0 to
avoid division by 0.

Reported-by: Claude <noreply@xxxxxxxxxxxxx>
Closes: https://gitlab.freedesktop.org/panfrost/linux/-/work_items/88
Fixes: f3ba91228e8e ("drm/panfrost: Add initial panfrost driver")
Reviewed-by: Steven Price <steven.price@xxxxxxx>
Signed-off-by: Adrián Larumbe <adrian.larumbe@xxxxxxxxxxxxx>
---
 drivers/gpu/drm/panfrost/panfrost_devfreq.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/panfrost/panfrost_devfreq.c b/drivers/gpu/drm/panfrost/panfrost_devfreq.c
index b51c30778811..0fe81d259274 100644
--- a/drivers/gpu/drm/panfrost/panfrost_devfreq.c
+++ b/drivers/gpu/drm/panfrost/panfrost_devfreq.c
@@ -78,7 +78,7 @@ static int panfrost_devfreq_get_dev_status(struct device *dev,
 
 	dev_dbg(pfdev->base.dev, "busy %lu total %lu %lu %% freq %lu MHz\n",
 		status->busy_time, status->total_time,
-		status->busy_time / (status->total_time / 100),
+		status->busy_time * 100 / MAX(status->total_time, 1),
 		status->current_frequency / 1000 / 1000);
 
 	return 0;

-- 
2.55.0