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| author | Marcin Jurkowski <marcin1j@gmail.com> | 2013-03-02 14:50:15 +0100 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2013-03-12 16:20:46 -0700 |
| commit | 9d1817cab2f030f6af360e961cc69bb1da8ad765 (patch) | |
| tree | 5061bd02d140075839e0b71180a594d869c40f7a /drivers/w1 | |
| parent | 34ccd8738e34180af34544d2bdd053e60e44a224 (diff) | |
| download | lwn-9d1817cab2f030f6af360e961cc69bb1da8ad765.tar.gz lwn-9d1817cab2f030f6af360e961cc69bb1da8ad765.zip | |
w1: fix oops when w1_search is called from netlink connector
On Sat, Mar 02, 2013 at 10:45:10AM +0100, Sven Geggus wrote:
> This is the bad commit I found doing git bisect:
> 04f482faf50535229a5a5c8d629cf963899f857c is the first bad commit
> commit 04f482faf50535229a5a5c8d629cf963899f857c
> Author: Patrick McHardy <kaber@trash.net>
> Date: Mon Mar 28 08:39:36 2011 +0000
Good job. I was too lazy to bisect for bad commit;)
Reading the code I found problematic kthread_should_stop call from netlink
connector which causes the oops. After applying a patch, I've been testing
owfs+w1 setup for nearly two days and it seems to work very reliable (no
hangs, no memleaks etc).
More detailed description and possible fix is given below:
Function w1_search can be called from either kthread or netlink callback.
While the former works fine, the latter causes oops due to kthread_should_stop
invocation.
This patch adds a check if w1_search is serving netlink command, skipping
kthread_should_stop invocation if so.
Signed-off-by: Marcin Jurkowski <marcin1j@gmail.com>
Acked-by: Evgeniy Polyakov <zbr@ioremap.net>
Cc: Josh Boyer <jwboyer@gmail.com>
Tested-by: Sven Geggus <lists@fuchsschwanzdomain.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: stable <stable@vger.kernel.org> # 3.0+
Diffstat (limited to 'drivers/w1')
| -rw-r--r-- | drivers/w1/w1.c | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/drivers/w1/w1.c b/drivers/w1/w1.c index 7994d933f040..7ce277d2bb67 100644 --- a/drivers/w1/w1.c +++ b/drivers/w1/w1.c @@ -924,7 +924,8 @@ void w1_search(struct w1_master *dev, u8 search_type, w1_slave_found_callback cb tmp64 = (triplet_ret >> 2); rn |= (tmp64 << i); - if (kthread_should_stop()) { + /* ensure we're called from kthread and not by netlink callback */ + if (!dev->priv && kthread_should_stop()) { mutex_unlock(&dev->bus_mutex); dev_dbg(&dev->dev, "Abort w1_search\n"); return; |