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authorRodolfo Giometti <giometti@linux.it>2009-06-19 16:58:20 +0200
committerJean Delvare <khali@linux-fr.org>2009-06-19 16:58:20 +0200
commitf18c41daea14baee11252da268cdf5dcd57c7c10 (patch)
treeec42ed7000fa64925db3cd596737bd54d9fa71ca /drivers/i2c/i2c-core.h
parent99cd8e25875a109455b709b5a41d4891b8d8e58e (diff)
downloadlinux-2.6.34-ux500-f18c41daea14baee11252da268cdf5dcd57c7c10.tar.gz
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.h4
1 files changed, 3 insertions, 1 deletions
diff --git a/drivers/i2c/i2c-core.h b/drivers/i2c/i2c-core.h
index cd5bff87485..9f9c57ff670 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;