From 4b9bc86d5a999e344098303882d6395d39e36c13 Mon Sep 17 00:00:00 2001 From: Sebastian Andrzej Siewior Date: Tue, 12 Apr 2016 17:16:54 +0200 Subject: fcoe: convert to kworker The driver creates its own per-CPU threads which are updated based on CPU hotplug events. It is also possible to use kworkers and remove some of the kthread infrastrucure. The code checked ->thread to decide if there is an active per-CPU thread. By using the kworker infrastructure this is no longer possible (or required). The thread pointer is saved in `kthread' instead of `thread' so anything trying to use thread is caught by the compiler. Currently only the bnx2fc driver is using struct fcoe_percpu_s and the kthread member. After a CPU went offline, we may still enqueue items on the "offline" CPU. This isn't much of a problem. The work will be done on a random CPU. The allocated crc_eof_page page won't be cleaned up. It is probably expected that the CPU comes up at some point so it should not be a problem. The crc_eof_page memory is released of course once the module is removed. This patch was only compile-tested due to -ENODEV. Cc: Vasu Dev Cc: "James E.J. Bottomley" Cc: "Martin K. Petersen" Cc: Christoph Hellwig Cc: fcoe-devel@open-fcoe.org Cc: linux-scsi@vger.kernel.org Signed-off-by: Sebastian Andrzej Siewior Tested-by: Johannes Thumshirn Reviewed-by: Johannes Thumshirn Signed-off-by: Martin K. Petersen --- drivers/scsi/bnx2fc/bnx2fc_fcoe.c | 8 ++++---- 1 file changed, 4 insertions(+), 4 deletions(-) (limited to 'drivers/scsi/bnx2fc') diff --git a/drivers/scsi/bnx2fc/bnx2fc_fcoe.c b/drivers/scsi/bnx2fc/bnx2fc_fcoe.c index a1881993982c..d6800afd0232 100644 --- a/drivers/scsi/bnx2fc/bnx2fc_fcoe.c +++ b/drivers/scsi/bnx2fc/bnx2fc_fcoe.c @@ -486,7 +486,7 @@ static int bnx2fc_rcv(struct sk_buff *skb, struct net_device *dev, __skb_queue_tail(&bg->fcoe_rx_list, skb); if (bg->fcoe_rx_list.qlen == 1) - wake_up_process(bg->thread); + wake_up_process(bg->kthread); spin_unlock(&bg->fcoe_rx_list.lock); @@ -2715,7 +2715,7 @@ static int __init bnx2fc_mod_init(void) } wake_up_process(l2_thread); spin_lock_bh(&bg->fcoe_rx_list.lock); - bg->thread = l2_thread; + bg->kthread = l2_thread; spin_unlock_bh(&bg->fcoe_rx_list.lock); for_each_possible_cpu(cpu) { @@ -2788,8 +2788,8 @@ static void __exit bnx2fc_mod_exit(void) /* Destroy global thread */ bg = &bnx2fc_global; spin_lock_bh(&bg->fcoe_rx_list.lock); - l2_thread = bg->thread; - bg->thread = NULL; + l2_thread = bg->kthread; + bg->kthread = NULL; while ((skb = __skb_dequeue(&bg->fcoe_rx_list)) != NULL) kfree_skb(skb); -- cgit v1.2.3