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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.h
parent6b355b33a64fd6d8ead2b838ec16fb9b551f71e8 (diff)
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.h')
-rw-r--r--drivers/w1/w1.h10
1 files changed, 10 insertions, 0 deletions
diff --git a/drivers/w1/w1.h b/drivers/w1/w1.h
index ca8081a101d..bc329d2bba2 100644
--- a/drivers/w1/w1.h
+++ b/drivers/w1/w1.h
@@ -155,6 +155,14 @@ struct w1_bus_master
u8, w1_slave_found_callback);
};
+/**
+ * enum w1_master_flags - bitfields used in w1_master.flags
+ * @W1_ABORT_SEARCH: abort searching early on shutdown
+ */
+enum w1_master_flags {
+ W1_ABORT_SEARCH = 0,
+};
+
struct w1_master
{
struct list_head w1_master_entry;
@@ -178,6 +186,8 @@ struct w1_master
/** 5V strong pullup duration in milliseconds, zero disabled. */
int pullup_duration;
+ long flags;
+
struct task_struct *thread;
struct mutex mutex;
struct mutex bus_mutex;