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Sat, 02 Mar 2013 05:50:17 -0800 (PST)
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Date: Sat, 2 Mar 2013 14:50:15 +0100
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From: Marcin Jurkowski <marcin1j@gmail.com>
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To: Sven Geggus <lists@fuchsschwanzdomain.de>
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Cc: Evgeniy Polyakov <zbr@ioremap.net>, linux-kernel@vger.kernel.org
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Subject: [PATCH 1/1] w1: fix oops when w1_search is called from netlink
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connector
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Message-ID: <20130302135015.GA21448@gmail.com>
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References: <20130116141627.GA23638@ioremap.net>
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<20130302001103.GB18026@gmail.com>
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<20130302094510.GA4695@geggus.net>
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In-Reply-To: <20130302094510.GA4695@geggus.net>
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Sender: linux-kernel-owner@vger.kernel.org
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Precedence: bulk
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X-Mailing-List: linux-kernel@vger.kernel.org
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On Sat, Mar 02, 2013 at 10:45:10AM +0100, Sven Geggus wrote:
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> This is the bad commit I found doing git bisect:
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> 04f482faf50535229a5a5c8d629cf963899f857c is the first bad commit
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> commit 04f482faf50535229a5a5c8d629cf963899f857c
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> Author: Patrick McHardy <kaber@trash.net>
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> Date: Mon Mar 28 08:39:36 2011 +0000
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Good job. I was too lazy to bisect for bad commit;)
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Reading the code I found problematic kthread_should_stop call from netlink
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connector which causes the oops. After applying a patch, I've been testing
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owfs+w1 setup for nearly two days and it seems to work very reliable (no
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hangs, no memleaks etc).
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More detailed description and possible fix is given below:
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Function w1_search can be called from either kthread or netlink callback.
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While the former works fine, the latter causes oops due to kthread_should_stop
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invocation.
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This patch adds a check if w1_search is serving netlink command, skipping
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kthread_should_stop invocation if so.
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Signed-off-by: Marcin Jurkowski <marcin1j@gmail.com>
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---
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drivers/w1/w1.c | 3 ++-
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1 file changed, 2 insertions(+), 1 deletion(-)
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diff --git a/drivers/w1/w1.c b/drivers/w1/w1.c
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index 7994d933..7e2220d 100644
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--- a/drivers/w1/w1.c
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+++ b/drivers/w1/w1.c
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@@ -924,7 +924,8 @@ void w1_search(struct w1_master *dev, u8 search_type, w1_slave_found_callback cb
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tmp64 = (triplet_ret >> 2);
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rn |= (tmp64 << i);
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- if (kthread_should_stop()) {
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+ /* ensure we're called from kthread and not by netlink callback */
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+ if (!dev->priv && kthread_should_stop()) {
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mutex_unlock(&dev->bus_mutex);
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dev_dbg(&dev->dev, "Abort w1_search\n");
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return;
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--
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1.7.12.4
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--
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