From f18c41daea14baee11252da268cdf5dcd57c7c10 Mon Sep 17 00:00:00 2001 From: Rodolfo Giometti Date: Fri, 19 Jun 2009 16:58:20 +0200 Subject: 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 Signed-off-by: Jean Delvare --- drivers/i2c/i2c-core.c | 5 +++-- 1 file changed, 3 insertions(+), 2 deletions(-) (limited to 'drivers/i2c/i2c-core.c') diff --git a/drivers/i2c/i2c-core.c b/drivers/i2c/i2c-core.c index eb084fa0df8..0e45c296d3d 100644 --- a/drivers/i2c/i2c-core.c +++ b/drivers/i2c/i2c-core.c @@ -33,6 +33,7 @@ #include #include #include +#include #include #include "i2c-core.h" @@ -509,7 +510,7 @@ static void i2c_scan_static_board_info(struct i2c_adapter *adapter) { struct i2c_devinfo *devinfo; - mutex_lock(&__i2c_board_lock); + down_read(&__i2c_board_lock); list_for_each_entry(devinfo, &__i2c_board_list, list) { if (devinfo->busnum == adapter->nr && !i2c_new_device(adapter, @@ -518,7 +519,7 @@ static void i2c_scan_static_board_info(struct i2c_adapter *adapter) "Can't create device at 0x%02x\n", devinfo->board_info.addr); } - mutex_unlock(&__i2c_board_lock); + up_read(&__i2c_board_lock); } static int i2c_do_add_adapter(struct device_driver *d, void *data) -- cgit v1.2.3