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i2c: Use rwsem instead of mutex for board info

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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>
This commit is contained in:
Rodolfo Giometti
2009-06-19 16:58:20 +02:00
committed by Jean Delvare
parent 99cd8e2587
commit f18c41daea
3 changed files with 10 additions and 6 deletions
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5
drivers/i2c/i2c-core.c
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@@ -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)