From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 5EB8DC9832F for ; Sun, 27 Sep 2026 23:50:48 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender:List-Subscribe:List-Help :List-Post:List-Archive:List-Unsubscribe:List-Id:In-Reply-To:Content-Type: MIME-Version:References:Message-ID:Subject:To:From:Date:Reply-To:Cc: Content-Transfer-Encoding:Content-ID:Content-Description:Resent-Date: Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Owner; bh=yBMcfrsbe/Ettl/L5zimHyGJU5sUAOy56KyYKLi8J4s=; b=CFgU3HfmWUVDs3G+V2ekmGonzT 4FBvQBoMD0V7LC/u8S0yaC/UWY5Jgi05vKiVd0eM94H6T94+ihaRN5UfD8EAinn3Isr0IIdRsQThr luV62vTIgZmMp+fGabtBZlUMe1znvMws+0gnKE0/r2wq9H9m858cIYbY6xWZiFBNScmPLko1wsNul OI+CfpOs2w/tU/OqFExQWdH5CsabIEJEcEY+FG3qUR15+XmVnNWM9rPBFFjOeYmJDmhC1glKsQcPS KW4zRYFdqZV5z4Xw4qT6LbexzGp3AtblThPtOnr08c/ts0nYbKNmguBJAFSn3fBRXNJLwx314rEf7 N9GGFqvw==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.99.1 #2 (Red Hat Linux)) id 1xAydl-0000000H1J0-2uZC; Sun, 27 Sep 2026 23:50:41 +0000 Received: from pidgin.makrotopia.org ([2a07:2ec0:3002::65]) by bombadil.infradead.org with esmtps (Exim 4.99.1 #2 (Red Hat Linux)) id 1xAydW-0000000H17y-24vH; Sun, 27 Sep 2026 23:50:27 +0000 Received: from local by pidgin.makrotopia.org with esmtpsa (TLS1.3:TLS_AES_256_GCM_SHA384:256:X25519MLKEM768) (Exim 4.100) (envelope-from ) id 1xAydR-000000000of-39hZ; Sun, 27 Sep 2026 23:50:21 +0000 Date: Mon, 28 Sep 2026 00:50:18 +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 , Chen-Yu Tsai , dri-devel@lists.freedesktop.org, linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-mediatek@lists.infradead.org Subject: [PATCH v8 06/14] drm/bridge: it6505: bail out of the IRQ handler when status reads fail Message-ID: <2e003c2e6fdb56d03c3a6effdf090079afb2ffaf.1790552614.git.daniel@makrotopia.org> References: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.9.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20260927_165026_559821_65011B0E X-CRM114-Status: GOOD ( 11.37 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org 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 --- v8: no changes 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 6fd8f5ba9acca..f249520ebd41d 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