| From | "K. Y. Srinivasan" <> | Subject | [PATCH 081/117] Staging: hv: vmbus: Introduce a lock to protect the ext field in hv_device | Date | Fri, 15 Jul 2011 10:47:09 -0700 |
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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 <kys@microsoft.com> Signed-off-by: Haiyang Zhang <haiyangz@microsoft.com> --- 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 c4a9f38..82ba110 100644 --- a/drivers/staging/hv/hyperv.h +++ b/drivers/staging/hv/hyperv.h @@ -826,6 +826,9 @@ 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 ffd6066..29c1712 100644 --- a/drivers/staging/hv/vmbus_drv.c +++ b/drivers/staging/hv/vmbus_drv.c @@ -578,6 +578,7 @@ struct hv_device *vmbus_child_device_create(uuid_le *type, return NULL; } + spin_lock_init(&child_device_obj->ext_lock); child_device_obj->channel = channel; memcpy(&child_device_obj->dev_type, type, sizeof(uuid_le)); memcpy(&child_device_obj->dev_instance, instance, -- 1.7.4.1
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