linux-kernel - [PATCH 1/1] cciss: use timeout to ensure scan thread exits

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Message-ID: <20090616204325.GA29502@beardog.cca.cpqcorp.net>
Date:	Tue, 16 Jun 2009 15:43:25 -0500
From:	"Mike Miller (OS Dev)" <mikem@...rdog.cca.cpqcorp.net>
To:	Andrew Morton <akpm@...ux-foundation.org>,
	Jens Axboe <jens.axboe@...cle.com>
Cc:	James Bottomley <james.bottomley@...senpartnership.com>,
	LKML <linux-kernel@...r.kernel.org>,
	LKML-SCSI <linux-scsi@...r.kernel.org>
Subject: [PATCH 1/1] cciss: use timeout to ensure scan thread exits

Patch 1 of 1

This patch implements wait_for_completion_interruptible_timeout in the
scan_thread function to ensure it will exit cleanly during rmmod. Calling
complete in cciss_remove_one caused a race condition. Using the wait with a
timeout seems to work around that but it does fire the thread. The overhead
should be minimal.

Changelog:
Replace wait_for_completion_interruptible with
wait_for_completion_interruptible_timeout in scan_thread().
Use 5 second timeout value to avoid race.

Signed-off-by: Mike Miller

diff --git a/drivers/block/cciss.c b/drivers/block/cciss.c
index 4d4d5e0..76e7c10 100644
--- a/drivers/block/cciss.c
+++ b/drivers/block/cciss.c
@@ -3043,7 +3043,7 @@ static int scan_thread(void *data)
 	h->rescan_wait = &wait;
 
 	for (;;) {
-		rc = wait_for_completion_interruptible(&wait);
+		rc = wait_for_completion_interruptible_timeout(&wait, 5);
 		if (kthread_should_stop())
 			break;
 		if (!rc)
--
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