linux-kernel - staging/wilc1000: wrong conversion to completion?

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Date:	Mon, 11 Jul 2016 09:41:15 +0200
From:	Jiri Slaby <jslaby@...e.cz>
To:	Binoy Jayan <binoy.jayan@...aro.org>
Cc:	Arnd Bergmann <arnd@...db.de>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Linux kernel mailing list <linux-kernel@...r.kernel.org>
Subject: staging/wilc1000: wrong conversion to completion?

Hi,

while looking at this commit:

commit b27a6d5e636ac80b223a18ca2b3c892f1caef9e3
Author: Binoy Jayan <binoy.jayan@...aro.org>
Date:   Wed Jun 15 11:00:34 2016 +0530

    staging: wilc1000: Replace semaphore txq_event with completion

    The semaphore 'txq_event' is used as completion, so convert it
    to a struct completion type.

    Signed-off-by: Binoy Jayan <binoy.jayan@...aro.org>
    Reviewed-by: Arnd Bergmann <arnd@...db.de>
    Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

diff --git a/drivers/staging/wilc1000/linux_wlan.c
b/drivers/staging/wilc1000/linux_wlan.c
index 274c390d17cd..baf932681362 100644
--- a/drivers/staging/wilc1000/linux_wlan.c
+++ b/drivers/staging/wilc1000/linux_wlan.c
@@ -316,7 +316,7 @@ static int linux_wlan_txq_task(void *vp)

        complete(&wl->txq_thread_started);
        while (1) {
-               down(&wl->txq_event);
+               wait_for_completion(&wl->txq_event);

                if (wl->close) {
                        complete(&wl->txq_thread_started);
@@ -650,7 +650,7 @@ void wilc1000_wlan_deinit(struct net_device *dev)
                        mutex_unlock(&wl->hif_cs);
                }
                if (&wl->txq_event)
-                       up(&wl->txq_event);
+                       wait_for_completion(&wl->txq_event);


I wonder: is this correct? Should that be complete() instead?









                wlan_deinitialize_threads(dev);
                deinit_irq(dev);
@@ -681,7 +681,7 @@ static int wlan_init_locks(struct net_device *dev)
        spin_lock_init(&wl->txq_spinlock);
        sema_init(&wl->txq_add_to_head_cs, 1);

-       sema_init(&wl->txq_event, 0);
+       init_completion(&wl->txq_event);

        sema_init(&wl->cfg_event, 0);
        sema_init(&wl->sync_event, 0);
@@ -738,7 +738,7 @@ static void wlan_deinitialize_threads(struct
net_device *dev)
        wl->close = 1;

        if (&wl->txq_event)
-               up(&wl->txq_event);
+               complete(&wl->txq_event);

        if (wl->txq_thread) {
                kthread_stop(wl->txq_thread);

thanks,
-- 
js
suse labs