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Subject[PATCH 06/40] Staging: hv: vmbus: Introduce a lock to protect the ext field in hv_device
Date
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>
Signed-off-by: Abhishek Kane <v-abkane@microsoft.com>
Signed-off-by: Hank Janssen <hjanssen@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 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


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