Re: [PATCH][next] drivers: hv: remove redundant assignment to pointer primary_channel

From: Vitaly Kuznetsov
Date: Tue Apr 14 2020 - 12:52:21 EST


Colin King <colin.king@xxxxxxxxxxxxx> writes:

> From: Colin Ian King <colin.king@xxxxxxxxxxxxx>
>
> The pointer primary_channel is being assigned with a value that is never,
> The assignment is redundant and can be removed.
>
> Addresses-Coverity: ("Unused value")
> Signed-off-by: Colin Ian King <colin.king@xxxxxxxxxxxxx>
> ---
> drivers/hv/channel_mgmt.c | 2 --
> 1 file changed, 2 deletions(-)
>
> diff --git a/drivers/hv/channel_mgmt.c b/drivers/hv/channel_mgmt.c
> index ffd7fffa5f83..f7bbb8dc4b0f 100644
> --- a/drivers/hv/channel_mgmt.c
> +++ b/drivers/hv/channel_mgmt.c
> @@ -425,8 +425,6 @@ void hv_process_channel_removal(struct vmbus_channel *channel)
>
> if (channel->primary_channel == NULL) {
> list_del(&channel->listentry);
> -
> - primary_channel = channel;
> } else {
> primary_channel = channel->primary_channel;
> spin_lock_irqsave(&primary_channel->lock, flags);

If I'm looking at the right source (5.7-rc1) it *is* beeing used:

if (channel->primary_channel == NULL) {
list_del(&channel->listentry);

primary_channel = channel;
} else {
primary_channel = channel->primary_channel;
spin_lock_irqsave(&primary_channel->lock, flags);
list_del(&channel->sc_list);
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.
*/
if (channel->affinity_policy == HV_LOCALIZED)
cpumask_clear_cpu(channel->target_cpu,
&primary_channel->alloced_cpus_in_node);
^^^^^ HERE ^^^^^

--
Vitaly