From 87a9404ef0be2aac949fdb8854e71d100859f6f5 Mon Sep 17 00:00:00 2001 From: Neil Horman Date: Tue, 21 Jul 2015 09:55:39 -0400 Subject: [PATCH] staging: unisys: Clean up kthread usage Remove the has_stopped completion as theres already one available internally. Correct the while loops Remove the while loop in drain_queue as it already exists in the top level loop Signed-off-by: Neil Horman Signed-off-by: Benjamin Romer Signed-off-by: Greg Kroah-Hartman --- .../staging/unisys/visornic/visornic_main.c | 182 +++++++++--------- 1 file changed, 86 insertions(+), 96 deletions(-) diff --git a/drivers/staging/unisys/visornic/visornic_main.c b/drivers/staging/unisys/visornic/visornic_main.c index a421a5bea343..923c580b9a5d 100644 --- a/drivers/staging/unisys/visornic/visornic_main.c +++ b/drivers/staging/unisys/visornic/visornic_main.c @@ -91,7 +91,6 @@ static struct visor_driver visornic_driver = { struct visor_thread_info { struct task_struct *task; - struct completion has_stopped; int id; }; @@ -317,7 +316,6 @@ static int visor_thread_start(struct visor_thread_info *thrinfo, void *thrcontext, char *name) { /* used to stop the thread */ - init_completion(&thrinfo->has_stopped); thrinfo->task = kthread_run(threadfn, thrcontext, name); if (IS_ERR(thrinfo->task)) { pr_debug("%s failed (%ld)\n", @@ -341,10 +339,8 @@ static void visor_thread_stop(struct visor_thread_info *thrinfo) if (!thrinfo->id) return; /* thread not running */ - kthread_stop(thrinfo->task); - /* give up if the thread has NOT died in 1 minute */ - if (wait_for_completion_timeout(&thrinfo->has_stopped, 60 * HZ)) - thrinfo->id = 0; + BUG_ON(kthread_stop(thrinfo->task)); + thrinfo->id = 0; } static ssize_t enable_ints_write(struct file *file, @@ -1691,99 +1687,95 @@ drain_queue(struct uiscmdrsp *cmdrsp, struct visornic_devdata *devdata) unsigned long flags; struct net_device *netdev; - /* drain queue */ - while (1) { - /* TODO: CLIENT ACQUIRE -- Don't really need this at the - * moment */ - if (!visorchannel_signalremove(devdata->dev->visorchannel, - IOCHAN_FROM_IOPART, - cmdrsp)) - break; /* queue empty */ - - switch (cmdrsp->net.type) { - case NET_RCV: - devdata->chstat.got_rcv++; - /* process incoming packet */ - visornic_rx(cmdrsp); - break; - case NET_XMIT_DONE: - spin_lock_irqsave(&devdata->priv_lock, flags); - devdata->chstat.got_xmit_done++; - if (cmdrsp->net.xmtdone.xmt_done_result) - devdata->chstat.xmit_fail++; - /* only call queue wake if we stopped it */ - netdev = ((struct sk_buff *)cmdrsp->net.buf)->dev; - /* ASSERT netdev == vnicinfo->netdev; */ - if ((netdev == devdata->netdev) && - netif_queue_stopped(netdev)) { - /* check to see if we have crossed - * the lower watermark for - * netif_wake_queue() + /* TODO: CLIENT ACQUIRE -- Don't really need this at the + * moment */ + if (!visorchannel_signalremove(devdata->dev->visorchannel, + IOCHAN_FROM_IOPART, + cmdrsp)) + return; /* queue empty */ + + switch (cmdrsp->net.type) { + case NET_RCV: + devdata->chstat.got_rcv++; + /* process incoming packet */ + visornic_rx(cmdrsp); + break; + case NET_XMIT_DONE: + spin_lock_irqsave(&devdata->priv_lock, flags); + devdata->chstat.got_xmit_done++; + if (cmdrsp->net.xmtdone.xmt_done_result) + devdata->chstat.xmit_fail++; + /* only call queue wake if we stopped it */ + netdev = ((struct sk_buff *)cmdrsp->net.buf)->dev; + /* ASSERT netdev == vnicinfo->netdev; */ + if ((netdev == devdata->netdev) && + netif_queue_stopped(netdev)) { + /* check to see if we have crossed + * the lower watermark for + * netif_wake_queue() + */ + if (((devdata->chstat.sent_xmit >= + devdata->chstat.got_xmit_done) && + (devdata->chstat.sent_xmit - + devdata->chstat.got_xmit_done <= + devdata->lower_threshold_net_xmits)) || + ((devdata->chstat.sent_xmit < + devdata->chstat.got_xmit_done) && + (ULONG_MAX - devdata->chstat.got_xmit_done + + devdata->chstat.sent_xmit <= + devdata->lower_threshold_net_xmits))) { + /* enough NET_XMITs completed + * so can restart netif queue */ - if (((devdata->chstat.sent_xmit >= - devdata->chstat.got_xmit_done) && - (devdata->chstat.sent_xmit - - devdata->chstat.got_xmit_done <= - devdata->lower_threshold_net_xmits)) || - ((devdata->chstat.sent_xmit < - devdata->chstat.got_xmit_done) && - (ULONG_MAX - devdata->chstat.got_xmit_done - + devdata->chstat.sent_xmit <= - devdata->lower_threshold_net_xmits))) { - /* enough NET_XMITs completed - * so can restart netif queue - */ - netif_wake_queue(netdev); - devdata->flow_control_lower_hits++; - } - } - skb_unlink(cmdrsp->net.buf, &devdata->xmitbufhead); - spin_unlock_irqrestore(&devdata->priv_lock, flags); - kfree_skb(cmdrsp->net.buf); - break; - case NET_RCV_ENBDIS_ACK: - devdata->chstat.got_enbdisack++; - netdev = (struct net_device *) - cmdrsp->net.enbdis.context; - spin_lock_irqsave(&devdata->priv_lock, flags); - devdata->enab_dis_acked = 1; - spin_unlock_irqrestore(&devdata->priv_lock, flags); - - if (devdata->server_down && - devdata->server_change_state) { - /* Inform Linux that the link is up */ - devdata->server_down = false; - devdata->server_change_state = false; netif_wake_queue(netdev); - netif_carrier_on(netdev); + devdata->flow_control_lower_hits++; } - break; - case NET_CONNECT_STATUS: - netdev = devdata->netdev; - if (cmdrsp->net.enbdis.enable == 1) { - spin_lock_irqsave(&devdata->priv_lock, flags); - devdata->enabled = cmdrsp->net.enbdis.enable; - spin_unlock_irqrestore(&devdata->priv_lock, - flags); - netif_wake_queue(netdev); - netif_carrier_on(netdev); - } else { - netif_stop_queue(netdev); - netif_carrier_off(netdev); - spin_lock_irqsave(&devdata->priv_lock, flags); - devdata->enabled = cmdrsp->net.enbdis.enable; - spin_unlock_irqrestore(&devdata->priv_lock, - flags); - } - break; - default: - break; } - /* cmdrsp is now available for reuse */ + skb_unlink(cmdrsp->net.buf, &devdata->xmitbufhead); + spin_unlock_irqrestore(&devdata->priv_lock, flags); + kfree_skb(cmdrsp->net.buf); + break; + case NET_RCV_ENBDIS_ACK: + devdata->chstat.got_enbdisack++; + netdev = (struct net_device *) + cmdrsp->net.enbdis.context; + spin_lock_irqsave(&devdata->priv_lock, flags); + devdata->enab_dis_acked = 1; + spin_unlock_irqrestore(&devdata->priv_lock, flags); if (kthread_should_stop()) break; + if (devdata->server_down && + devdata->server_change_state) { + /* Inform Linux that the link is up */ + devdata->server_down = false; + devdata->server_change_state = false; + netif_wake_queue(netdev); + netif_carrier_on(netdev); + } + break; + case NET_CONNECT_STATUS: + netdev = devdata->netdev; + if (cmdrsp->net.enbdis.enable == 1) { + spin_lock_irqsave(&devdata->priv_lock, flags); + devdata->enabled = cmdrsp->net.enbdis.enable; + spin_unlock_irqrestore(&devdata->priv_lock, + flags); + netif_wake_queue(netdev); + netif_carrier_on(netdev); + } else { + netif_stop_queue(netdev); + netif_carrier_off(netdev); + spin_lock_irqsave(&devdata->priv_lock, flags); + devdata->enabled = cmdrsp->net.enbdis.enable; + spin_unlock_irqrestore(&devdata->priv_lock, + flags); + } + break; + default: + break; } + /* cmdrsp is now available for reuse */ } /** @@ -1803,9 +1795,9 @@ process_incoming_rsps(void *v) cmdrsp = kmalloc(SZ, GFP_ATOMIC); if (!cmdrsp) - complete_and_exit(&devdata->threadinfo.has_stopped, 0); + return 0; - while (1) { + while (!kthread_should_stop()) { wait_event_interruptible_timeout( devdata->rsp_queue, (atomic_read( &devdata->interrupt_rcvd) == 1), @@ -1818,12 +1810,10 @@ process_incoming_rsps(void *v) atomic_set(&devdata->interrupt_rcvd, 0); send_rcv_posts_if_needed(devdata); drain_queue(cmdrsp, devdata); - if (kthread_should_stop()) - break; } kfree(cmdrsp); - complete_and_exit(&devdata->threadinfo.has_stopped, 0); + return 0; } /** -- 2.25.1