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Staging: hv: storvsc: Introduce state to manage the lifecycle of stor device

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Introduce state to manage the lifecycle of stor device. This would be the
basis for managing the references on the stor object.

Signed-off-by: K. Y. Srinivasan <kys@microsoft.com>
Signed-off-by: Haiyang Zhang <haiyangz@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
This commit is contained in:
K. Y. Srinivasan
2011-08-27 11:31:05 -07:00
committed by Greg Kroah-Hartman
parent df977d6c90
commit f6c17484eb
2 changed files with 8 additions and 2 deletions
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2
drivers/staging/hv/hyperv_storage.h
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@@ -266,7 +266,7 @@ struct storvsc_device {
/* 0 indicates the device is being destroyed */
atomic_t ref_count;
bool destroy;
bool drain_notify;
atomic_t num_outstanding_req;

8
drivers/staging/hv/storvsc.c
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@@ -43,7 +43,7 @@ static inline struct storvsc_device *alloc_stor_device(struct hv_device *device)
/* Set to 2 to allow both inbound and outbound traffics */
/* (ie get_out_stor_device() and get_in_stor_device()) to proceed. */
atomic_set(&stor_device->ref_count, 2);
stor_device->destroy = false;
init_waitqueue_head(&stor_device->waiting_to_drain);
stor_device->device = device;
device->ext = stor_device;
@@ -399,9 +399,15 @@ int storvsc_dev_add(struct hv_device *device,
int storvsc_dev_remove(struct hv_device *device)
{
struct storvsc_device *stor_device;
unsigned long flags;
stor_device = release_stor_device(device);
spin_lock_irqsave(&device->channel->inbound_lock, flags);
stor_device->destroy = true;
spin_unlock_irqrestore(&device->channel->inbound_lock, flags);
/*
* At this point, all outbound traffic should be disable. We
* only allow inbound traffic (responses) to proceed so that