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Mon, 2 Dec 2019 22:24:53 -0600 From: Wayne Lin To: , Subject: [PATCH v2] drm/dp_mst: Correct the bug in drm_dp_update_payload_part1() Date: Tue, 3 Dec 2019 12:24:23 +0800 Message-ID: <20191203042423.5961-1-Wayne.Lin@amd.com> X-Mailer: git-send-email 2.17.1 MIME-Version: 1.0 X-EOPAttributedMessage: 0 X-MS-Office365-Filtering-HT: Tenant X-Forefront-Antispam-Report: CIP:165.204.84.17; IPV:NLI; CTRY:US; EFV:NLI; SFV:NSPM; SFS:(10009020)(4636009)(39860400002)(346002)(396003)(136003)(376002)(428003)(199004)(189003)(478600001)(53416004)(305945005)(2906002)(5660300002)(110136005)(16586007)(54906003)(36756003)(86362001)(316002)(70206006)(47776003)(6666004)(356004)(14444005)(48376002)(50466002)(426003)(2616005)(336012)(26005)(186003)(51416003)(70586007)(7696005)(50226002)(1076003)(8936002)(4326008)(81156014)(81166006)(8676002); DIR:OUT; SFP:1101; SCL:1; SRVR:MWHPR12MB1693; H:SATLEXMB02.amd.com; FPR:; SPF:None; LANG:en; PTR:InfoDomainNonexistent; A:1; MX:1; X-MS-PublicTrafficType: Email X-MS-Office365-Filtering-Correlation-Id: 9e08dec3-5780-4c79-c087-08d777a8c0b2 X-MS-TrafficTypeDiagnostic: MWHPR12MB1693: X-Microsoft-Antispam-PRVS: X-MS-Oob-TLC-OOBClassifiers: OLM:389; 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a=rsa-sha256; c=relaxed/relaxed; d=amdcloud.onmicrosoft.com; s=selector2-amdcloud-onmicrosoft-com; h=From:Date:Subject:Message-ID:Content-Type:MIME-Version:X-MS-Exchange-SenderADCheck; bh=NeY9sOvJKgySrocSHq00gqKYwLNel0jO87Qw+qq9LBE=; b=caOjoGuNaJ0njtMjUiltEvRJlmf/rT/DwF+t/9wtyDZ609EPotuSvb9Eg92OGlG6YTPF2MQCAyTUyVaBq3H7paeQmi5OoMQ3pJHany726GMqt8EzLLLN72favcaLPFAIW3pZCPYaqV5+BVe79U1B0RqUSTdUF6ldANApH5xpFVQ= X-Mailman-Original-Authentication-Results: spf=none (sender IP is 165.204.84.17) smtp.mailfrom=amd.com; lists.freedesktop.org; dkim=none (message not signed) header.d=none;lists.freedesktop.org; dmarc=permerror action=none header.from=amd.com; X-BeenThere: dri-devel@lists.freedesktop.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: Direct Rendering Infrastructure - Development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: jerry.zuo@amd.com, Nicholas.Kazlauskas@amd.com, Wayne Lin Errors-To: dri-devel-bounces@lists.freedesktop.org Sender: "dri-devel" [Why] If the payload_state is DP_PAYLOAD_DELETE_LOCAL in series, current code doesn't delete the payload at current index and just move the index to next one after shuffling payloads. [How] Drop the i++ increasing part in for loop head and decide whether to increase the index or not according to payload_state of current payload. Changes since v1: * Refine the code to have it easy reading * Amend the commit message to meet the way code is modified now. Signed-off-by: Wayne Lin Reviewed-by: Lyude Paul --- drivers/gpu/drm/drm_dp_mst_topology.c | 6 ++++-- 1 file changed, 4 insertions(+), 2 deletions(-) diff --git a/drivers/gpu/drm/drm_dp_mst_topology.c b/drivers/gpu/drm/drm_dp_mst_topology.c index 81e92b260d7a..4ef6decc0551 100644 --- a/drivers/gpu/drm/drm_dp_mst_topology.c +++ b/drivers/gpu/drm/drm_dp_mst_topology.c @@ -3176,9 +3176,11 @@ int drm_dp_update_payload_part1(struct drm_dp_mst_topology_mgr *mgr) drm_dp_mst_topology_put_port(port); } - for (i = 0; i < mgr->max_payloads; i++) { - if (mgr->payloads[i].payload_state != DP_PAYLOAD_DELETE_LOCAL) + for (i = 0; i < mgr->max_payloads; /* do nothing */) { + if (mgr->payloads[i].payload_state != DP_PAYLOAD_DELETE_LOCAL) { + i++; continue; + } DRM_DEBUG_KMS("removing payload %d\n", i); for (j = i; j < mgr->max_payloads - 1; j++) {