Commit 9d1817ca authored by Marcin Jurkowski's avatar Marcin Jurkowski Committed by Greg Kroah-Hartman

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:
> 04f482fa is the first bad commit
> commit 04f482fa
> 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: default avatarMarcin Jurkowski <marcin1j@gmail.com>
Acked-by: default avatarEvgeniy Polyakov <zbr@ioremap.net>
Cc: Josh Boyer <jwboyer@gmail.com>
Tested-by: default avatarSven Geggus <lists@fuchsschwanzdomain.de>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: stable <stable@vger.kernel.org> # 3.0+
parent 34ccd873
...@@ -924,7 +924,8 @@ void w1_search(struct w1_master *dev, u8 search_type, w1_slave_found_callback cb ...@@ -924,7 +924,8 @@ void w1_search(struct w1_master *dev, u8 search_type, w1_slave_found_callback cb
tmp64 = (triplet_ret >> 2); tmp64 = (triplet_ret >> 2);
rn |= (tmp64 << i); 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); mutex_unlock(&dev->bus_mutex);
dev_dbg(&dev->dev, "Abort w1_search\n"); dev_dbg(&dev->dev, "Abort w1_search\n");
return; return;
......
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