From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from pidgin.makrotopia.org (pidgin.makrotopia.org [185.142.180.65]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 7D4F148123A for ; Wed, 22 Jul 2026 15:46:28 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=185.142.180.65 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1784735192; cv=none; b=uofsdAPgFqBN4zjNo/M714YxGvScyKSMAmBPbPyPfoGhqFLSZ/TqEOqdzF6vDrxFoQCvLg3Q+FWY+8NSwXKqEnQBE/+T4YJqn/+js/BOpkIQARGlhs5Tqgp+LiffbcWXfxTg9uibo1+WLftNbdC4Uops9DGcs5Mi6PKCzJIsEd0= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1784735192; c=relaxed/simple; bh=6KlPhuaAhD9VsWMegjZbnhf6oiSFIgxi5J6Zv2P6wss=; h=Date:From:To:Cc:Subject:Message-ID:References:MIME-Version: Content-Type:Content-Disposition:In-Reply-To; b=k2a2M4BoSnV47LaxPEL97KAXehPpfqEMD9R0mj2y1bh2b9p1XkuIDbPk+p33PCSUP/+RKa7IGMJ7QPrQi99iMV4jrBh/cDJn5F2BtaWnfO5M0OEr4ip/64BWZ1ZdzH++94W3/4K725tPog3saAD6CaXS4Oy3DDPB5hS2V0r32dg= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=makrotopia.org; spf=pass smtp.mailfrom=makrotopia.org; arc=none smtp.client-ip=185.142.180.65 Authentication-Results: smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=makrotopia.org Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=makrotopia.org Received: from local by pidgin.makrotopia.org with esmtpsa (TLS1.3:TLS_AES_256_GCM_SHA384:256) (Exim 4.99) (envelope-from ) id 1wmZ9J-000000006e0-2uhX; Wed, 22 Jul 2026 15:46:21 +0000 Date: Wed, 22 Jul 2026 16:46:18 +0100 From: Daniel Golle To: Andrzej Hajda , Neil Armstrong , Robert Foss , Laurent Pinchart , Jonas Karlman , Jernej Skrabec , Luca Ceresoli , Maarten Lankhorst , Maxime Ripard , Thomas Zimmermann , David Airlie , Simona Vetter , Matthias Brugger , AngeloGioacchino Del Regno , Hermes Wu , Allen Chen , Pin-yen Lin , dri-devel@lists.freedesktop.org, linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-mediatek@lists.infradead.org Cc: Chen-Yu Tsai Subject: [PATCH v5 05/11] drm/bridge: it6505: bail out of the IRQ handler when status reads fail Message-ID: References: Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: When reading the interrupt status registers fails, the negative error codes end up in int_status[], where it6505_test_bit() sees almost all bits set: every interrupt sub-handler runs on garbage and the error values are even written back to the status registers. Return IRQ_NONE instead. Fixes: b5c84a9edcd4 ("drm/bridge: add it6505 driver") Signed-off-by: Daniel Golle --- v5: new patch drivers/gpu/drm/bridge/ite-it6505.c | 5 +++++ 1 file changed, 5 insertions(+) diff --git a/drivers/gpu/drm/bridge/ite-it6505.c b/drivers/gpu/drm/bridge/ite-it6505.c index 0f79ddfd1501..0e141310ed3c 100644 --- a/drivers/gpu/drm/bridge/ite-it6505.c +++ b/drivers/gpu/drm/bridge/ite-it6505.c @@ -2713,6 +2713,11 @@ static irqreturn_t it6505_int_threaded_handler(int unused, void *data) int_status[1] = it6505_read(it6505, INT_STATUS_02); int_status[2] = it6505_read(it6505, INT_STATUS_03); + if (int_status[0] < 0 || int_status[1] < 0 || int_status[2] < 0) { + pm_runtime_put_sync(dev); + return IRQ_NONE; + } + it6505_write(it6505, INT_STATUS_01, int_status[0]); it6505_write(it6505, INT_STATUS_02, int_status[1]); it6505_write(it6505, INT_STATUS_03, int_status[2]); -- 2.55.0