On Thu, 2015-08-13 at 17:07 -0700, K. Y. Srinivasan wrote:
> From: Dexuan Cui <de...@microsoft.com>
>
> This fixes the recent commit 3b71107d73b16074afa7658f3f0fcf837aabfe24:
Which tree is this in? upstream linus is giving me bad object on that
id.
> Drivers: hv: vmbus: Further improve CPU affiliation logic
>
> Without the fix, reloading hv_netvsc hangs the guest.
The reason for looking for the commit id was to see if cc to stable was
necessary, is it?
James
> Signed-off-by: Dexuan Cui <de...@microsoft.com>
> Signed-off-by: K. Y. Srinivasan <k...@microsoft.com>
> ---
> drivers/hv/channel_mgmt.c | 17 +++++++++++++++++
> 1 files changed, 17 insertions(+), 0 deletions(-)
>
> diff --git a/drivers/hv/channel_mgmt.c b/drivers/hv/channel_mgmt.c
> index 3ab4753..8a4105c 100644
> --- a/drivers/hv/channel_mgmt.c
> +++ b/drivers/hv/channel_mgmt.c
> @@ -204,6 +204,8 @@ void hv_process_channel_removal(struct vmbus_channel
> *channel, u32 relid)
> spin_lock_irqsave(&vmbus_connection.channel_lock, flags);
> list_del(&channel->listentry);
> spin_unlock_irqrestore(&vmbus_connection.channel_lock, flags);
> +
> + primary_channel = channel;
> } else {
> primary_channel = channel->primary_channel;
> spin_lock_irqsave(&primary_channel->lock, flags);
> @@ -211,6 +213,14 @@ void hv_process_channel_removal(struct vmbus_channel
> *channel, u32 relid)
> primary_channel->num_sc--;
> spin_unlock_irqrestore(&primary_channel->lock, flags);
> }
> +
> + /*
> + * We need to free the bit for init_vp_index() to work in the case
> + * of sub-channel, when we reload drivers like hv_netvsc.
> + */
> + cpumask_clear_cpu(channel->target_cpu,
> + &primary_channel->alloced_cpus_in_node);
> +
> free_channel(channel);
> }
>
> @@ -457,6 +467,13 @@ static void init_vp_index(struct vmbus_channel *channel,
> const uuid_le *type_gui
> continue;
> }
>
> + /*
> + * NOTE: in the case of sub-channel, we clear the sub-channel
> + * related bit(s) in primary->alloced_cpus_in_node in
> + * hv_process_channel_removal(), so when we reload drivers
> + * like hv_netvsc in SMP guest, here we're able to re-allocate
> + * bit from primary->alloced_cpus_in_node.
> + */
> if (!cpumask_test_cpu(cur_cpu,
> &primary->alloced_cpus_in_node)) {
> cpumask_set_cpu(cur_cpu,
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