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authorDavid Fries <David@Fries.net>2014-01-15 22:29:13 -0600
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2014-02-07 15:40:17 -0800
commit421056987620fecb43c22c558e127085c406b7ba (patch)
tree12b735281e22323f036b87f010d11ea8addb2af0 /drivers/w1/w1_int.c
parent6b355b33a64fd6d8ead2b838ec16fb9b551f71e8 (diff)
downloadlinux-421056987620fecb43c22c558e127085c406b7ba.tar.bz2
w1: fixup search to support abort from netlink
Before 63706172f33 "rework kthread_stop()" kthread_should_stop() always returned false when called from a non-kthread task, after it would oops as a non-kthread didn't have that structure and netlink was calling search from a thread which wasn't a kthread. 9d1817cab2f030 "w1: fix oops when w1_search is called from netlink connector", modified the code to avoid calling kthread_stop from a netlink thread. Introduce a w1_master flag and bit W1_ABORT_SEARCH to identify abort to cleanly support both kthread and netlink search abort. A search can take seconds to run, so it is important to abort early if the hardware is removed in the middle of a search. Signed-off-by: David Fries <David@Fries.net> Acked-by: Evgeniy Polyakov <zbr@ioremap.net> Cc: Marcin Jurkowski <marcin1j@gmail.com> Cc: Josh Boyer <jwboyer@gmail.com> Cc: Sven Geggus <lists@fuchsschwanzdomain.de> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/w1/w1_int.c')
-rw-r--r--drivers/w1/w1_int.c2
1 files changed, 2 insertions, 0 deletions
diff --git a/drivers/w1/w1_int.c b/drivers/w1/w1_int.c
index 590bd8a7cd1b..423f3c2b9e7d 100644
--- a/drivers/w1/w1_int.c
+++ b/drivers/w1/w1_int.c
@@ -172,6 +172,7 @@ int w1_add_master_device(struct w1_bus_master *master)
#if 0 /* Thread cleanup code, not required currently. */
err_out_kill_thread:
+ set_bit(W1_ABORT_SEARCH, &dev->flags);
kthread_stop(dev->thread);
#endif
err_out_rm_attr:
@@ -187,6 +188,7 @@ void __w1_remove_master_device(struct w1_master *dev)
struct w1_netlink_msg msg;
struct w1_slave *sl, *sln;
+ set_bit(W1_ABORT_SEARCH, &dev->flags);
kthread_stop(dev->thread);
mutex_lock(&w1_mlock);