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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-boardinfo.c | |
| parent | 99cd8e25875a109455b709b5a41d4891b8d8e58e (diff) | |
| download | kernel-common-f18c41daea14baee11252da268cdf5dcd57c7c10.tar.gz kernel-common-f18c41daea14baee11252da268cdf5dcd57c7c10.tar.bz2 kernel-common-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-boardinfo.c')
| -rw-r--r-- | drivers/i2c/i2c-boardinfo.c | 7 |
1 files changed, 4 insertions, 3 deletions
diff --git a/drivers/i2c/i2c-boardinfo.c b/drivers/i2c/i2c-boardinfo.c index ffb35f09df03..a26a34a06641 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; } |