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path: root/drivers/i2c/i2c-boardinfo.c
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Diffstat (limited to 'drivers/i2c/i2c-boardinfo.c')
-rw-r--r--drivers/i2c/i2c-boardinfo.c7
1 files changed, 4 insertions, 3 deletions
diff --git a/drivers/i2c/i2c-boardinfo.c b/drivers/i2c/i2c-boardinfo.c
index ffb35f09df0..a26a34a0664 100644
--- a/drivers/i2c/i2c-boardinfo.c
+++ b/drivers/i2c/i2c-boardinfo.c
@@ -18,6 +18,7 @@
#include <linux/kernel.h>
#include <linux/i2c.h>
+#include <linux/rwsem.h>
#include "i2c-core.h"
@@ -25,7 +26,7 @@
/* These symbols are exported ONLY FOR the i2c core.
* No other users will be supported.
*/
-DEFINE_MUTEX(__i2c_board_lock);
+DECLARE_RWSEM(__i2c_board_lock);
EXPORT_SYMBOL_GPL(__i2c_board_lock);
LIST_HEAD(__i2c_board_list);
@@ -63,7 +64,7 @@ i2c_register_board_info(int busnum,
{
int status;
- mutex_lock(&__i2c_board_lock);
+ down_write(&__i2c_board_lock);
/* dynamic bus numbers will be assigned after the last static one */
if (busnum >= __i2c_first_dynamic_bus_num)
@@ -84,7 +85,7 @@ i2c_register_board_info(int busnum,
list_add_tail(&devinfo->list, &__i2c_board_list);
}
- mutex_unlock(&__i2c_board_lock);
+ up_write(&__i2c_board_lock);
return status;
}