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From: Arnd Bergmann <arnd@arndb.de>
To: Max Vozeler <max@vozeler.com>
Cc: linux-kernel@vger.kernel.org,
	"Greg Kroah-Hartman" <gregkh@suse.de>,
	Takahiro Hirofuchi <hirofuchi@users.sourceforge.net>
Subject: Re: [PATCH 03/20] staging/usbip: convert to kthread
Date: Tue, 1 Mar 2011 23:15:55 +0100	[thread overview]
Message-ID: <201103012315.55188.arnd@arndb.de> (raw)
In-Reply-To: <4D4302AC.3050903@vozeler.com>

On Friday 28 January 2011 18:53:48 Max Vozeler wrote:
> I need to leave now for the next couple of days,
> so this is a bit rushed.
> 
> I can take a closer look and do tests in different
> setups during the next week.
> 

It seems we both forgot about this. This is what I now added to my tree.
Greg, I'll resubmit a folded version with the original patch.

	Arnd
8<------

staging/usbip: fix breakage from BKL removal
    
wait_event_interruptible() in a kthread needs
to check if the kthread should stop.
    
Thread creation was racy, calling kthread_run
instead of wake_up on an existing kthread
fixes this.
    
Reported-by: Max Vozeler <max@vozeler.com>
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
---

diff --git a/drivers/staging/usbip/stub_dev.c b/drivers/staging/usbip/stub_dev.c
index f2c6148..8214c35 100644
--- a/drivers/staging/usbip/stub_dev.c
+++ b/drivers/staging/usbip/stub_dev.c
@@ -139,8 +139,8 @@ static ssize_t store_sockfd(struct device *dev, struct device_attribute *attr,
 
 		spin_unlock(&sdev->ud.lock);
 
-		wake_up_process(sdev->ud.tcp_rx);
-		wake_up_process(sdev->ud.tcp_tx);
+		sdev->ud.tcp_rx = kthread_run(stub_rx_loop, &sdev->ud, "stub_rx");
+		sdev->ud.tcp_tx = kthread_run(stub_tx_loop, &sdev->ud, "stub_tx");
 
 		spin_lock(&sdev->ud.lock);
 		sdev->ud.status = SDEV_ST_USED;
@@ -339,9 +339,6 @@ static struct stub_device *stub_device_alloc(struct usb_device *udev,
 	 */
 	sdev->devid     = (busnum << 16) | devnum;
 
-	sdev->ud.tcp_rx = kthread_create(stub_rx_loop, &sdev->ud, "stub_rx");
-	sdev->ud.tcp_tx = kthread_create(stub_tx_loop, &sdev->ud, "stub_tx");
-
 	sdev->ud.side = USBIP_STUB;
 	sdev->ud.status = SDEV_ST_AVAILABLE;
 	/* sdev->ud.lock = SPIN_LOCK_UNLOCKED; */
diff --git a/drivers/staging/usbip/stub_tx.c b/drivers/staging/usbip/stub_tx.c
index 2477481..5523f25 100644
--- a/drivers/staging/usbip/stub_tx.c
+++ b/drivers/staging/usbip/stub_tx.c
@@ -365,7 +365,8 @@ int stub_tx_loop(void *data)
 
 		wait_event_interruptible(sdev->tx_waitq,
 				(!list_empty(&sdev->priv_tx) ||
-				 !list_empty(&sdev->unlink_tx)));
+				 !list_empty(&sdev->unlink_tx) ||
+				 kthread_should_stop()));
 	}
 
 	return 0;
diff --git a/drivers/staging/usbip/usbip_event.c b/drivers/staging/usbip/usbip_event.c
index 89aecec..f4b287e 100644
--- a/drivers/staging/usbip/usbip_event.c
+++ b/drivers/staging/usbip/usbip_event.c
@@ -67,12 +67,13 @@ static int event_handler_loop(void *data)
 	struct usbip_device *ud = data;
 
 	while (!kthread_should_stop()) {
-		if (event_handler(ud) < 0)
-			break;
-
 		wait_event_interruptible(ud->eh_waitq,
-					usbip_event_happened(ud));
+					usbip_event_happened(ud) ||
+					kthread_should_stop());
 		usbip_dbg_eh("wakeup\n");
+
+		if (event_handler(ud) < 0)
+			break;
 	}
 	return 0;
 }
diff --git a/drivers/staging/usbip/vhci_tx.c b/drivers/staging/usbip/vhci_tx.c
index 6d065b9..d9ab49d 100644
--- a/drivers/staging/usbip/vhci_tx.c
+++ b/drivers/staging/usbip/vhci_tx.c
@@ -230,7 +230,8 @@ int vhci_tx_loop(void *data)
 
 		wait_event_interruptible(vdev->waitq_tx,
 				(!list_empty(&vdev->priv_tx) ||
-				 !list_empty(&vdev->unlink_tx)));
+				 !list_empty(&vdev->unlink_tx) ||
+				 kthread_should_stop()));
 
 		usbip_dbg_vhci_tx("pending urbs ?, now wake up\n");
 	}

  parent reply	other threads:[~2011-03-01 22:16 UTC|newest]

Thread overview: 64+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2011-01-25 22:17 [RFC 00/20] Proposal for remaining BKL users Arnd Bergmann
2011-01-25 22:17 ` Arnd Bergmann
2011-01-25 22:17 ` [PATCH 01/20] drm/i810: remove the BKL Arnd Bergmann
2011-01-25 22:17 ` [PATCH 02/20] drm: remove i830 driver Arnd Bergmann
2011-01-25 22:17 ` [PATCH 03/20] staging/usbip: convert to kthread Arnd Bergmann
2011-01-28 17:53   ` Max Vozeler
2011-01-28 18:48     ` Arnd Bergmann
2011-03-01 22:15     ` Arnd Bergmann [this message]
2011-01-25 22:17 ` [PATCH 04/20] staging/cx25721: serialize access to devlist Arnd Bergmann
2011-01-26 16:23   ` Palash Bandyopadhyay
2011-01-31 21:37   ` Greg KH
2011-01-25 22:17 ` [PATCH 05/20] staging/go7007: remove the BKL Arnd Bergmann
2011-01-25 22:17 ` [PATCH 06/20] staging: Remove autofs3 Arnd Bergmann
2011-01-26  7:41   ` H. Peter Anvin
2011-01-25 22:17 ` [PATCH 07/20] staging: remove smbfs Arnd Bergmann
2011-01-25 22:17 ` [PATCH 08/20] adfs: remove the big kernel lock Arnd Bergmann
2011-01-25 22:20   ` Russell King
2011-01-25 22:17 ` [PATCH 09/20] hpfs: rename big kernel lock to hpfs_lock Arnd Bergmann
2011-01-25 22:17 ` [PATCH 10/20] hpfs: replace BKL with a global mutex Arnd Bergmann
2011-01-26  0:15   ` Andi Kleen
2011-01-26  0:19   ` Andi Kleen
2011-01-26 12:48     ` [PATCH v2] hpfs: remove the BKL Arnd Bergmann
2011-01-26 12:50     ` [PATCH 10/20] hpfs: replace BKL with a global mutex Arnd Bergmann
2011-01-26 16:52       ` Andi Kleen
2011-01-27  5:01         ` Nick Piggin
2011-01-27 10:57           ` Miklos Szeredi
2011-01-25 22:17 ` [PATCH 11/20] hpfs: move to drivers/staging Arnd Bergmann
2011-02-07 16:17   ` Mikulas Patocka
2011-02-07 19:31     ` Arnd Bergmann
2011-01-25 22:17 ` [PATCH 12/20] x25: remove the BKL Arnd Bergmann
2011-01-27 10:07   ` Andrew Hendry
2011-01-27 12:17     ` Arnd Bergmann
2011-01-27 12:38       ` [PATCH v2] " Arnd Bergmann
2011-01-27 13:20         ` Eric Dumazet
2011-01-27 13:43           ` Arnd Bergmann
2011-01-25 22:17 ` [PATCH 13/20] appletalk: move to staging Arnd Bergmann
2011-01-25 22:17 ` [PATCH 14/20] staging/appletalk: remove the BKL Arnd Bergmann
2011-01-25 22:29   ` David Miller
2011-01-26 12:57     ` Arnd Bergmann
2011-01-25 22:17 ` [PATCH 15/20] ufs: " Arnd Bergmann
2011-01-26  2:30   ` Nick Bowler
2011-01-26 12:53     ` Arnd Bergmann
2011-01-27  5:47   ` Nick Piggin
2011-01-27 13:13     ` Arnd Bergmann
2011-01-25 22:17 ` [PATCH 16/20] ipx: " Arnd Bergmann
2011-01-25 22:17 ` [PATCH 17/20] tracing: don't trace " Arnd Bergmann
2011-01-25 22:28   ` Frederic Weisbecker
2011-01-25 22:17 ` [PATCH 18/20] rtmutex-tester: remove BKL tests Arnd Bergmann
2011-01-26 15:00   ` [tip:core/locking] rtmutex-tester: Remove " tip-bot for Arnd Bergmann
2011-02-22 20:57   ` [tip:irq/core] rtmutex: tester: " tip-bot for Arnd Bergmann
2011-01-25 22:17 ` [PATCH 19/20] drivers: remove extraneous includes of smp_lock.h Arnd Bergmann
2011-01-25 22:17 ` [PATCH 20/20] BKL: That's all, folks Arnd Bergmann
2011-01-26  6:19   ` Ingo Molnar
2011-01-26  8:47     ` Alan Cox
2011-01-26 11:01       ` Ingo Molnar
2011-01-26 11:22   ` Thomas Gleixner
2011-01-26  2:22 ` [RFC 00/20] Proposal for remaining BKL users Greg KH
2011-01-26  2:22   ` Greg KH
2011-01-26 11:31   ` Arnd Bergmann
2011-01-26 11:31     ` Arnd Bergmann
2011-01-26 11:58     ` Mauro Carvalho Chehab
2011-01-26 13:45       ` Arnd Bergmann
2011-01-26 13:45         ` Arnd Bergmann
2011-01-26 16:24         ` Palash Bandyopadhyay

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