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 2D7AF4B1297 for ; Thu, 24 Sep 2026 18:40:54 +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=1790275256; cv=none; b=ghSbKkHKKfgyP1NGZ5966zG7R8HeMomTPVM4jzYlC2zg+wFXKIkgpQeHt/cMfnjlyejNM7CnEfW4p466N/Jw14TF0CvBJfUVfmRKxDgKbbLH9C3+DH+gd1qdNcfCRIEX6q52V+wjFahQjU2vRuekIg6/IkTsm8QZvLEwOSvxSzw= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1790275256; c=relaxed/simple; bh=5mISDZcGTjwVXvMRmBEGp6K/ZpDHMG097JBGImrPyfg=; h=Date:From:To:Subject:Message-ID:References:MIME-Version: Content-Type:Content-Disposition:In-Reply-To; b=NRbunu2JGh9SZKkeR0OmwJDOh0ZTBIjrX3od3wOtsAeuwtZmoum9btOIkcGUZrGFAZpLZ2JvCf8eO7DVACTreA/cY2MzPndWVmgD452aEeBTo1AV/gF+iztqfHdjU3wepyNZiigHexkFxIwo5ecUllYKkGJJYJAb3k9xp3Z5Al0= 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:X25519MLKEM768) (Exim 4.100) (envelope-from ) id 1x9oNG-000000007LL-1RoW; Thu, 24 Sep 2026 18:40:50 +0000 Date: Thu, 24 Sep 2026 19:40:47 +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 , Allen Chen , Hermes Wu , Pin-yen Lin , dri-devel@lists.freedesktop.org, linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-mediatek@lists.infradead.org Subject: [PATCH v7 06/14] 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 --- v7: no changes v6: no changes 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 b9e5ce36f556..42106bc2056e 100644 --- a/drivers/gpu/drm/bridge/ite-it6505.c +++ b/drivers/gpu/drm/bridge/ite-it6505.c @@ -2714,6 +2714,11 @@ 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