> -----Original Message-----
> From: Vitaly Kuznetsov [mailto:vkuzn...@redhat.com]
> Sent: Tuesday, January 20, 2015 7:45 AM
> To: KY Srinivasan; de...@linuxdriverproject.org
> Cc: Haiyang Zhang; linux-ker...@vger.kernel.org; Dexuan Cui; Jason Wang;
> Radim Krčmář; Dan Carpenter
> Subject: [PATCH v3 2/3] Drivers: hv: rename sc_lock to the more generic lock
> 
> sc_lock spinlock in struct vmbus_channel is being used to not only protect
> the sc_list field, e.g. vmbus_open() function uses it to implement test-and-
> set access to the state field. Rename it to the more generic 'lock' and add 
> the
> description.
> 
> Signed-off-by: Vitaly Kuznetsov <vkuzn...@redhat.com>
Thanks Vitaly.
Signed-off-by: K. Y. Srinivasan <k...@microsoft.com>

> ---
>  drivers/hv/channel.c      |  6 +++---
>  drivers/hv/channel_mgmt.c | 10 +++++-----
>  include/linux/hyperv.h    |  7 ++++++-
>  3 files changed, 14 insertions(+), 9 deletions(-)
> 
> diff --git a/drivers/hv/channel.c b/drivers/hv/channel.c index
> 433f72a..8608ed1 100644
> --- a/drivers/hv/channel.c
> +++ b/drivers/hv/channel.c
> @@ -73,14 +73,14 @@ int vmbus_open(struct vmbus_channel
> *newchannel, u32 send_ringbuffer_size,
>       unsigned long flags;
>       int ret, t, err = 0;
> 
> -     spin_lock_irqsave(&newchannel->sc_lock, flags);
> +     spin_lock_irqsave(&newchannel->lock, flags);
>       if (newchannel->state == CHANNEL_OPEN_STATE) {
>               newchannel->state = CHANNEL_OPENING_STATE;
>       } else {
> -             spin_unlock_irqrestore(&newchannel->sc_lock, flags);
> +             spin_unlock_irqrestore(&newchannel->lock, flags);
>               return -EINVAL;
>       }
> -     spin_unlock_irqrestore(&newchannel->sc_lock, flags);
> +     spin_unlock_irqrestore(&newchannel->lock, flags);
> 
>       newchannel->onchannel_callback = onchannelcallback;
>       newchannel->channel_callback_context = context; diff --git
> a/drivers/hv/channel_mgmt.c b/drivers/hv/channel_mgmt.c index
> 01f2c2b..c6fdd74 100644
> --- a/drivers/hv/channel_mgmt.c
> +++ b/drivers/hv/channel_mgmt.c
> @@ -146,7 +146,7 @@ static struct vmbus_channel *alloc_channel(void)
>               return NULL;
> 
>       spin_lock_init(&channel->inbound_lock);
> -     spin_lock_init(&channel->sc_lock);
> +     spin_lock_init(&channel->lock);
> 
>       INIT_LIST_HEAD(&channel->sc_list);
>       INIT_LIST_HEAD(&channel->percpu_list);
> @@ -246,9 +246,9 @@ static void vmbus_process_rescind_offer(struct
> work_struct *work)
>               spin_unlock_irqrestore(&vmbus_connection.channel_lock,
> flags);
>       } else {
>               primary_channel = channel->primary_channel;
> -             spin_lock_irqsave(&primary_channel->sc_lock, flags);
> +             spin_lock_irqsave(&primary_channel->lock, flags);
>               list_del(&channel->sc_list);
> -             spin_unlock_irqrestore(&primary_channel->sc_lock, flags);
> +             spin_unlock_irqrestore(&primary_channel->lock, flags);
>       }
>       free_channel(channel);
>  }
> @@ -323,9 +323,9 @@ static void vmbus_process_offer(struct work_struct
> *work)
>                        * Process the sub-channel.
>                        */
>                       newchannel->primary_channel = channel;
> -                     spin_lock_irqsave(&channel->sc_lock, flags);
> +                     spin_lock_irqsave(&channel->lock, flags);
>                       list_add_tail(&newchannel->sc_list, &channel-
> >sc_list);
> -                     spin_unlock_irqrestore(&channel->sc_lock, flags);
> +                     spin_unlock_irqrestore(&channel->lock, flags);
> 
>                       if (newchannel->target_cpu != get_cpu()) {
>                               put_cpu();
> diff --git a/include/linux/hyperv.h b/include/linux/hyperv.h index
> 476c685..02dd978 100644
> --- a/include/linux/hyperv.h
> +++ b/include/linux/hyperv.h
> @@ -722,7 +722,12 @@ struct vmbus_channel {
>        */
>       void (*sc_creation_callback)(struct vmbus_channel *new_sc);
> 
> -     spinlock_t sc_lock;
> +     /*
> +      * The spinlock to protect the structure. It is being used to protect
> +      * test-and-set access to various attributes of the structure as well
> +      * as all sc_list operations.
> +      */
> +     spinlock_t lock;
>       /*
>        * All Sub-channels of a primary channel are linked here.
>        */
> --
> 1.9.3

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