From mboxrd@z Thu Jan 1 00:00:00 1970 From: "K. Y. Srinivasan" Subject: [PATCH 06/40] Staging: hv: vmbus: Introduce a lock to protect the ext field in hv_device Date: Wed, 29 Jun 2011 07:39:03 -0700 Message-ID: <1309358377-8537-6-git-send-email-kys@microsoft.com> References: <1309358301-8488-1-git-send-email-kys@microsoft.com> <1309358377-8537-1-git-send-email-kys@microsoft.com> Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Return-path: In-Reply-To: <1309358377-8537-1-git-send-email-kys@microsoft.com> List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: devel-bounces@linuxdriverproject.org Errors-To: devel-bounces@linuxdriverproject.org To: gregkh@suse.de, linux-kernel@vger.kernel.org, devel@linuxdriverproject.org, virtualization@lists.osdl.org Cc: Haiyang Zhang , Abhishek Kane List-Id: virtualization@lists.linuxfoundation.org The current mechanism for handling references in broken. Introduce a lock to protect the ext field in hv_device. Signed-off-by: K. Y. Srinivasan Signed-off-by: Haiyang Zhang Signed-off-by: Abhishek Kane Signed-off-by: Hank Janssen --- drivers/staging/hv/hyperv.h | 3 +++ drivers/staging/hv/vmbus_drv.c | 1 + 2 files changed, 4 insertions(+), 0 deletions(-) diff --git a/drivers/staging/hv/hyperv.h b/drivers/staging/hv/hyperv.h index 370b096..ff3c69d 100644 --- a/drivers/staging/hv/hyperv.h +++ b/drivers/staging/hv/hyperv.h @@ -830,6 +830,9 @@ struct hv_device { struct vmbus_channel *channel; + /* This lock protects the device extension field */ + spinlock_t ext_lock; + /* Device extension; */ void *ext; }; diff --git a/drivers/staging/hv/vmbus_drv.c b/drivers/staging/hv/vmbus_drv.c index 2e6bfc1..903362e 100644 --- a/drivers/staging/hv/vmbus_drv.c +++ b/drivers/staging/hv/vmbus_drv.c @@ -557,6 +557,7 @@ struct hv_device *vmbus_child_device_create(struct hv_guid *type, return NULL; } + spin_lock_init(&child_device_obj->ext_lock); child_device_obj->channel = channel; /* * Get the human readable device type name and stash it away. -- 1.7.4.1