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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.c | |
| parent | 99cd8e25875a109455b709b5a41d4891b8d8e58e (diff) | |
| download | linux-f18c41daea14baee11252da268cdf5dcd57c7c10.tar.gz linux-f18c41daea14baee11252da268cdf5dcd57c7c10.tar.bz2 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.c')
| -rw-r--r-- | drivers/i2c/i2c-core.c | 5 |
1 files changed, 3 insertions, 2 deletions
diff --git a/drivers/i2c/i2c-core.c b/drivers/i2c/i2c-core.c index eb084fa0df83..0e45c296d3d2 100644 --- a/drivers/i2c/i2c-core.c +++ b/drivers/i2c/i2c-core.c @@ -33,6 +33,7 @@ #include <linux/completion.h> #include <linux/hardirq.h> #include <linux/irqflags.h> +#include <linux/rwsem.h> #include <asm/uaccess.h> #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) |