From fd4227f03546c323b5b21568f727233e9792d298 Mon Sep 17 00:00:00 2001 From: =?UTF-8?q?Adri=C3=A1n=20Larumbe?= Date: Thu, 20 Aug 2026 15:04:48 +0100 Subject: [PATCH] drm/panfrost: Prevent division by 0 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit When updating and debug-printing devfreq stats, in the very unlikely off-chance that total device time is less than 100 ns, division by 0 would happen. Fix the divisor when relevant and rearrange operands. Reported-by: Claude Closes: https://gitlab.freedesktop.org/panfrost/linux/-/work_items/88 Fixes: f3ba91228e8e ("drm/panfrost: Add initial panfrost driver") Reviewed-by: Steven Price Reviewed-by: Boris Brezillon Link: https://patch.msgid.link/20260820-b4-panfrost-fixes-v1-2-1b2c2376f4bc@collabora.com Signed-off-by: Adrián Larumbe --- 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;