From patchwork Wed Sep 11 06:32:41 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Stanley Chu X-Patchwork-Id: 11140345 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id E3EC51395 for ; Wed, 11 Sep 2019 06:33:07 +0000 (UTC) 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 mail.kernel.org (Postfix) with ESMTPS id C1CC121D79 for ; Wed, 11 Sep 2019 06:33:07 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=lists.infradead.org header.i=@lists.infradead.org header.b="pL74YDAu" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org C1CC121D79 Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=mediatek.com Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=linux-arm-kernel-bounces+patchwork-linux-arm=patchwork.kernel.org@lists.infradead.org DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20170209; h=Sender: Content-Transfer-Encoding:Content-Type:Cc:List-Subscribe:List-Help:List-Post: List-Archive:List-Unsubscribe:List-Id:MIME-Version:References:In-Reply-To: Message-ID:Date:Subject:To:From:Reply-To:Content-ID:Content-Description: Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID: List-Owner; bh=axT18gmle7KkUeYfHa+qeAVBvcYZ4/sGlnPHJ1ZKfvo=; b=pL74YDAuG+IApl 3vKmjTPLbbADLZS5ecK8uZjrd2VjUf2LtRQABwk2vhVgRYjOp590t616+tIjDc2FP0xZvt5TCRPDl mcP1B+XRoDAb/hNCS9wXO7H78hyUgovWc54/ycwtuXLTpDKYtr9DMM+Gmyp0sHcMHZXZPVgemooc0 K0x7CUg+sAFSRln1q126f67+sg1Ymn4v1vPgWVrL9ERZG3ccPIulC7RJHhIdFh8F3xyQzzLIe4uZP qQFmmDH7Lr7wUfI7iGSr8hUjsT/vtu+zyGFRMr1HNJUYU+DRfywhqXKXbCNufA214x9TRnNBCsnlJ lyLVeLU3NXvzB2A0GTyQ==; Received: from localhost ([127.0.0.1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.92 #3 (Red Hat Linux)) id 1i7wBY-0006iz-3f; Wed, 11 Sep 2019 06:33:00 +0000 Received: from mailgw01.mediatek.com ([216.200.240.184]) by bombadil.infradead.org with esmtps (Exim 4.92 #3 (Red Hat Linux)) id 1i7wBV-0006gf-NZ; Wed, 11 Sep 2019 06:32:59 +0000 X-UUID: 8cf64771a85a40fbb0c11cd3ed54e9ab-20190910 X-UUID: 8cf64771a85a40fbb0c11cd3ed54e9ab-20190910 Received: from mtkcas67.mediatek.inc [(172.29.193.45)] by mailgw01.mediatek.com (envelope-from ) (musrelay.mediatek.com ESMTP with TLS) with ESMTP id 1572287264; Tue, 10 Sep 2019 22:32:49 -0800 Received: from mtkmbs07n1.mediatek.inc (172.21.101.16) by MTKMBS62N1.mediatek.inc (172.29.193.41) with Microsoft SMTP Server (TLS) id 15.0.1395.4; Tue, 10 Sep 2019 23:32:47 -0700 Received: from MTKCAS06.mediatek.inc (172.21.101.30) by mtkmbs07n1.mediatek.inc (172.21.101.16) with Microsoft SMTP Server (TLS) id 15.0.1395.4; Wed, 11 Sep 2019 14:32:46 +0800 Received: from mtkswgap22.mediatek.inc (172.21.77.33) by MTKCAS06.mediatek.inc (172.21.101.73) with Microsoft SMTP Server id 15.0.1395.4 via Frontend Transport; Wed, 11 Sep 2019 14:32:46 +0800 From: Stanley Chu To: , , , , , Subject: [PATCH v1 1/2] block: bypass blk_set_runtime_active for uninitialized q->dev Date: Wed, 11 Sep 2019 14:32:41 +0800 Message-ID: <1568183562-18241-2-git-send-email-stanley.chu@mediatek.com> X-Mailer: git-send-email 1.7.9.5 In-Reply-To: <1568183562-18241-1-git-send-email-stanley.chu@mediatek.com> References: <1568183562-18241-1-git-send-email-stanley.chu@mediatek.com> MIME-Version: 1.0 X-MTK: N X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20190910_233257_777829_B5CF0ECE X-CRM114-Status: UNSURE ( 7.81 ) X-CRM114-Notice: Please train this message. X-Spam-Score: 0.0 (/) X-Spam-Report: SpamAssassin version 3.4.2 on bombadil.infradead.org summary: Content analysis details: (0.0 points) pts rule name description ---- ---------------------- -------------------------------------------------- -0.0 RCVD_IN_DNSWL_NONE RBL: Sender listed at https://www.dnswl.org/, no trust [216.200.240.184 listed in list.dnswl.org] -0.0 SPF_PASS SPF: sender matches SPF record 0.0 SPF_HELO_NONE SPF: HELO does not publish an SPF Record 0.0 UNPARSEABLE_RELAY Informational: message has unparseable relay lines X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: andy.teng@mediatek.com, chun-hung.wu@mediatek.com, kuohong.wang@mediatek.com, linux-mediatek@lists.infradead.org, peter.wang@mediatek.com, Stanley Chu , linux-arm-kernel@lists.infradead.org Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+patchwork-linux-arm=patchwork.kernel.org@lists.infradead.org Some devices may skip blk_pm_runtime_init() and have null pointer in its request_queue->dev. For example, SCSI devices of UFS Well-Known LUNs. Currently the null pointer is checked by the user of blk_set_runtime_active(), i.e., scsi_dev_type_resume(). It is better to check it by blk_set_runtime_active() itself instead of by its users. Signed-off-by: Stanley Chu --- block/blk-pm.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/block/blk-pm.c b/block/blk-pm.c index 0a028c189897..56ed94f7a2a3 100644 --- a/block/blk-pm.c +++ b/block/blk-pm.c @@ -207,6 +207,9 @@ EXPORT_SYMBOL(blk_post_runtime_resume); */ void blk_set_runtime_active(struct request_queue *q) { + if (!q->dev) + return; + spin_lock_irq(&q->queue_lock); q->rpm_status = RPM_ACTIVE; pm_runtime_mark_last_busy(q->dev);