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authorJiri Kosina <jikos@jikos.cz>2006-12-10 21:21:30 +0100
committerJean Delvare <khali@arrakis.delvare>2006-12-10 21:21:30 +0100
commit6ea23039cb1cc7c379eb5fba0ed2c53291e9bea7 (patch)
treec22887d242a0c3813789c63c4db2fd59b1f3ef7e /include
parentad04d5c3879dcf79ba0fa1826eab991f7b7a2de8 (diff)
downloadop-kernel-dev-6ea23039cb1cc7c379eb5fba0ed2c53291e9bea7.zip
op-kernel-dev-6ea23039cb1cc7c379eb5fba0ed2c53291e9bea7.tar.gz
i2c: Add support for nested i2c bus locking
This patch adds the 'level' field into the i2c_adapter structure, which is used to represent the 'logical' level of nesting for the purposes of lockdep. This field is then used in the i2c_transfer() function, to acquire the per-adapter bus_lock with correct nesting level. Signed-off-by: Jiri Kosina <jikos@jikos.cz> Signed-off-by: Jean Delvare <khali@linux-fr.org>
Diffstat (limited to 'include')
-rw-r--r--include/linux/i2c.h1
1 files changed, 1 insertions, 0 deletions
diff --git a/include/linux/i2c.h b/include/linux/i2c.h
index 9b5d047..08df416 100644
--- a/include/linux/i2c.h
+++ b/include/linux/i2c.h
@@ -216,6 +216,7 @@ struct i2c_adapter {
int (*client_unregister)(struct i2c_client *);
/* data fields that are valid for all devices */
+ u8 level; /* nesting level for lockdep */
struct mutex bus_lock;
struct mutex clist_lock;
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