On Sat, Dec 03, 2016 at 12:34:31PM -0800, kys@xxxxxxxxxxxxxxxxxxxxxx wrote:
> From: K. Y. Srinivasan <kys@xxxxxxxxxxxxx>
>
> Enhance the rescind callback functionality by permitting the passing of an opaque
> pointer. This functionality will be used by vmbus device drivers to implement
> rescind related cleanup more efficiently.
Eeek, why a void *? Please make this a _real_ pointer.
>
> Signed-off-by: K. Y. Srinivasan <kys@xxxxxxxxxxxxx>
> ---
> drivers/hv/channel_mgmt.c | 11 +++++++----
> include/linux/hyperv.h | 7 ++++---
> 2 files changed, 11 insertions(+), 7 deletions(-)
>
> diff --git a/drivers/hv/channel_mgmt.c b/drivers/hv/channel_mgmt.c
> index f9c5827..d83c1ac 100644
> --- a/drivers/hv/channel_mgmt.c
> +++ b/drivers/hv/channel_mgmt.c
> @@ -825,8 +825,10 @@ static void vmbus_onoffer_rescind(struct vmbus_channel_message_header *hdr)
>
> if (channel->device_obj) {
> if (channel->chn_rescind_callback) {
> - channel->chn_rescind_callback(channel);
> - goto out;
> + channel->chn_rescind_callback(channel,
> + channel->rescind_arg);
> + if (is_hvsock_channel(channel))
> + goto out;
> }
> /*
> * We will have to unregister this device from the
> @@ -1215,9 +1217,10 @@ bool vmbus_are_subchannels_present(struct vmbus_channel *primary)
> }
> EXPORT_SYMBOL_GPL(vmbus_are_subchannels_present);
>
> -void vmbus_set_chn_rescind_callback(struct vmbus_channel *channel,
> - void (*chn_rescind_cb)(struct vmbus_channel *))
> +void vmbus_set_chn_rescind_callback(struct vmbus_channel *channel, void *arg,
> + void (*chn_rescind_cb)(struct vmbus_channel *, void *))
> {
> channel->chn_rescind_callback = chn_rescind_cb;
> + channel->rescind_arg = arg;
> }
> EXPORT_SYMBOL_GPL(vmbus_set_chn_rescind_callback);
> diff --git a/include/linux/hyperv.h b/include/linux/hyperv.h
> index 35053f9..a9a0ce4 100644
> --- a/include/linux/hyperv.h
> +++ b/include/linux/hyperv.h
> @@ -800,7 +800,8 @@ struct vmbus_channel {
> * Channel rescind callback. Some channels (the hvsock ones), need to
> * register a callback which is invoked in vmbus_onoffer_rescind().
> */
> - void (*chn_rescind_callback)(struct vmbus_channel *channel);
> + void (*chn_rescind_callback)(struct vmbus_channel *channel, void *arg);
> + void *rescind_arg;
Why does the channel have rescind_arg here?
Where do you use this functionality?
thanks,
greg k-h
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