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| author |   Rodolfo Giometti <giometti@linux.it> | 2009-06-19 16:58:20 +0200 |
|---|---|---|
| committer |   Jean Delvare <khali@linux-fr.org> | 2009-06-19 16:58:20 +0200 |
| commit | f18c41daea14baee11252da268cdf5dcd57c7c10 (patch) | |
| tree | ec42ed7000fa64925db3cd596737bd54d9fa71ca /drivers/i2c/i2c-core.h | |
| parent | i2c: Add a sysfs interface to instantiate devices (diff) | |
| download | wireguard-linux-f18c41daea14baee11252da268cdf5dcd57c7c10.tar.xz wireguard-linux-f18c41daea14baee11252da268cdf5dcd57c7c10.zip | |
i2c: Use rwsem instead of mutex for board info
By using rwsem we can easily manage recursive calls of
i2c_scan_static_board_info() function without breaking the locking.
Signed-off-by: Rodolfo Giometti <giometti@linux.it>
Signed-off-by: Jean Delvare <khali@linux-fr.org>
Diffstat (limited to 'drivers/i2c/i2c-core.h')
| -rw-r--r-- | drivers/i2c/i2c-core.h | 4 |
1 files changed, 3 insertions, 1 deletions
diff --git a/drivers/i2c/i2c-core.h b/drivers/i2c/i2c-core.h index cd5bff874855..9f9c57ff6708 100644 --- a/drivers/i2c/i2c-core.h +++ b/drivers/i2c/i2c-core.h @@ -16,6 +16,8 @@ * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */ +#include <linux/rwsem.h> + struct i2c_devinfo { struct list_head list; int busnum; @@ -25,7 +27,7 @@ struct i2c_devinfo { /* board_lock protects board_list and first_dynamic_bus_num. * only i2c core components are allowed to use these symbols. */ -extern struct mutex __i2c_board_lock; +extern struct rw_semaphore __i2c_board_lock; extern struct list_head __i2c_board_list; extern int __i2c_first_dynamic_bus_num; |