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[23.128.96.18]) by mx.google.com with ESMTP id l7si1683257ejb.373.2020.10.29.05.28.18; Thu, 29 Oct 2020 05:28:41 -0700 (PDT) Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 23.128.96.18 as permitted sender) client-ip=23.128.96.18; Authentication-Results: mx.google.com; dkim=pass header.i=@oracle.com header.s=corp-2020-01-29 header.b=nbvroTbm; spf=pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 23.128.96.18 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org; dmarc=pass (p=NONE sp=NONE dis=NONE) header.from=oracle.com Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726090AbgJ2MZz (ORCPT + 99 others); Thu, 29 Oct 2020 08:25:55 -0400 Received: from userp2120.oracle.com ([156.151.31.85]:37362 "EHLO userp2120.oracle.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726066AbgJ2MZz (ORCPT ); Thu, 29 Oct 2020 08:25:55 -0400 Received: from pps.filterd (userp2120.oracle.com [127.0.0.1]) by userp2120.oracle.com (8.16.0.42/8.16.0.42) with SMTP id 09TCOojK082355; Thu, 29 Oct 2020 12:25:54 GMT DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=oracle.com; h=from : to : cc : subject : date : message-id : in-reply-to : references; s=corp-2020-01-29; bh=muC+62ccY3AJOJRwsluIQP+9e8kedGedtYzp9yud9+Y=; b=nbvroTbmCKbWjCxuWYjnzpJRG5mmu5g/VWnvGa2Hmg5ifn2mLfbTCc+UyWkqwww0+LKd BBfek//51yIrJq1pmoxn1iPSbKvZoNOu9EKJsEBiua1HfCy6B10pGY/u8rgitvwLoGxd cK8RIy+7uNPablAuIzi835U/QXantWZNWymvDY9Vr83JLjMU0PD2mquZIYnwFgi+ZmjD oyoIe/RwC0cMxXpxdQ/PMoKhPCGPLHedZ2wE4rSU77TtP/rwyiTYSGfHlhgaYe73oN7J gny67V/kvNaEziE7r/2Aq6rlqQtr9NynqCjzsgSDiEb5fr/0tYCvQ2M+eTUMWntP+PlG LQ== Received: from userp3020.oracle.com (userp3020.oracle.com [156.151.31.79]) by userp2120.oracle.com with ESMTP id 34dgm4a41e-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=FAIL); Thu, 29 Oct 2020 12:25:54 +0000 Received: from pps.filterd (userp3020.oracle.com [127.0.0.1]) by userp3020.oracle.com (8.16.0.42/8.16.0.42) with SMTP id 09TCAPio059339; Thu, 29 Oct 2020 12:25:53 GMT Received: from userv0121.oracle.com (userv0121.oracle.com [156.151.31.72]) by userp3020.oracle.com with ESMTP id 34cx1t5ere-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Thu, 29 Oct 2020 12:25:53 +0000 Received: from abhmp0004.oracle.com (abhmp0004.oracle.com [141.146.116.10]) by userv0121.oracle.com (8.14.4/8.13.8) with ESMTP id 09TCPod0000862; Thu, 29 Oct 2020 12:25:52 GMT Received: from mihai.localdomain (/10.153.73.25) by default (Oracle Beehive Gateway v4.0) with ESMTP ; Thu, 29 Oct 2020 05:25:50 -0700 From: Mihai Carabas To: linux-kernel@vger.kernel.org Cc: Peng Hao , Mihai Carabas Subject: [PATCH 3/4] misc/pvpanic: Avoid initializing multiple pvpanic devices Date: Thu, 29 Oct 2020 13:43:06 +0200 Message-Id: <1603971787-16784-4-git-send-email-mihai.carabas@oracle.com> X-Mailer: git-send-email 1.8.3.1 In-Reply-To: <1603971787-16784-1-git-send-email-mihai.carabas@oracle.com> References: <1603971787-16784-1-git-send-email-mihai.carabas@oracle.com> X-Proofpoint-Virus-Version: vendor=nai engine=6000 definitions=9788 signatures=668682 X-Proofpoint-Spam-Details: rule=notspam policy=default score=0 spamscore=0 phishscore=0 bulkscore=0 suspectscore=2 malwarescore=0 mlxlogscore=999 mlxscore=0 adultscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2009150000 definitions=main-2010290091 X-Proofpoint-Virus-Version: vendor=nai engine=6000 definitions=9788 signatures=668682 X-Proofpoint-Spam-Details: rule=notspam policy=default score=0 lowpriorityscore=0 impostorscore=0 adultscore=0 bulkscore=0 spamscore=0 phishscore=0 mlxlogscore=999 suspectscore=2 clxscore=1015 mlxscore=0 malwarescore=0 priorityscore=1501 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2009150000 definitions=main-2010290092 Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Peng Hao Avoid initializing multiple pvpanic devices when configure multiple pvpanic device driver type. Make sure that only one pvpanic device is working. Signed-off-by: Peng Hao Signed-off-by: Mihai Carabas --- drivers/misc/pvpanic/pvpanic.c | 19 +++++++++++++++++-- 1 file changed, 17 insertions(+), 2 deletions(-) diff --git a/drivers/misc/pvpanic/pvpanic.c b/drivers/misc/pvpanic/pvpanic.c index 4c831f5..8c7b534 100644 --- a/drivers/misc/pvpanic/pvpanic.c +++ b/drivers/misc/pvpanic/pvpanic.c @@ -17,10 +17,13 @@ #include static struct { + struct mutex lock; struct platform_device *pdev; void __iomem *base; bool is_ioport; -} pvpanic_data; +} pvpanic_data = { + .lock = __MUTEX_INITIALIZER(pvpanic_data.lock), +}; MODULE_AUTHOR("Hu Tao "); MODULE_DESCRIPTION("pvpanic device driver"); @@ -56,9 +59,17 @@ int pvpanic_add_device(struct device *dev, struct resource *res) struct platform_device *pdev; int ret; + mutex_lock(&pvpanic_data.lock); + if (pvpanic_data.pdev) { + mutex_unlock(&pvpanic_data.lock); + return -EEXIST; + } + pdev = platform_device_alloc("pvpanic", -1); - if (!pdev) + if (!pdev) { + mutex_unlock(&pvpanic_data.lock); return -ENOMEM; + } pdev->dev.parent = dev; @@ -70,9 +81,11 @@ int pvpanic_add_device(struct device *dev, struct resource *res) if (ret) goto err; pvpanic_data.pdev = pdev; + mutex_unlock(&pvpanic_data.lock); return 0; err: + mutex_unlock(&pvpanic_data.lock); platform_device_put(pdev); return ret; } @@ -80,8 +93,10 @@ int pvpanic_add_device(struct device *dev, struct resource *res) void pvpanic_remove_device(void) { + mutex_lock(&pvpanic_data.lock); platform_device_unregister(pvpanic_data.pdev); pvpanic_data.pdev = NULL; + mutex_unlock(&pvpanic_data.lock); } EXPORT_SYMBOL_GPL(pvpanic_remove_device); -- 1.8.3.1