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| author | Jiri Kosina <jikos@jikos.cz> | 2006-12-10 21:21:30 +0100 |
|---|---|---|
| committer | Jean Delvare <khali@arrakis.delvare> | 2006-12-10 21:21:30 +0100 |
| commit | 6ea23039cb1cc7c379eb5fba0ed2c53291e9bea7 (patch) | |
| tree | c22887d242a0c3813789c63c4db2fd59b1f3ef7e /drivers/i2c | |
| parent | i2c: Cleanups to the i2c-nforce2 bus driver (diff) | |
| download | linux-6ea23039cb1cc7c379eb5fba0ed2c53291e9bea7.tar.xz linux-6ea23039cb1cc7c379eb5fba0ed2c53291e9bea7.zip | |
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 'drivers/i2c')
| -rw-r--r-- | drivers/i2c/i2c-core.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/drivers/i2c/i2c-core.c b/drivers/i2c/i2c-core.c index 7ca81f42d14b..79eaa12474dd 100644 --- a/drivers/i2c/i2c-core.c +++ b/drivers/i2c/i2c-core.c @@ -603,7 +603,7 @@ int i2c_transfer(struct i2c_adapter * adap, struct i2c_msg *msgs, int num) } #endif - mutex_lock(&adap->bus_lock); + mutex_lock_nested(&adap->bus_lock, adap->level); ret = adap->algo->master_xfer(adap,msgs,num); mutex_unlock(&adap->bus_lock); |