use mutex instead of semaphore in SPI core/init code

The SPI core/init code uses a semaphore as mutex.  Use the mutex API instead
of the (binary) semaphore.

Signed-off-by: Matthias Kaehlcke <matthias.kaehlcke@gmail.com>
Acked-by: David Brownell <david-b@pacbell.net>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

diff --git a/drivers/spi/spi.c b/drivers/spi/spi.c
index 4831edb..018884d 100644 (file)
--- a/drivers/spi/spi.c
+++ b/drivers/spi/spi.c
@@ -23,6 +23,7 @@
 #include <linux/device.h>
 #include <linux/init.h>
 #include <linux/cache.h>
+#include <linux/mutex.h>
 #include <linux/spi/spi.h>
 
 
@@ -185,7 +186,7 @@ struct boardinfo {
 };
 
 static LIST_HEAD(board_list);
-static DECLARE_MUTEX(board_lock);
+static DEFINE_MUTEX(board_lock);
 
 
 /**
@@ -292,9 +293,9 @@ spi_register_board_info(struct spi_board_info const *info, unsigned n)
        bi->n_board_info = n;
        memcpy(bi->board_info, info, n * sizeof *info);
 
-       down(&board_lock);
+       mutex_lock(&board_lock);
        list_add_tail(&bi->list, &board_list);
-       up(&board_lock);
+       mutex_unlock(&board_lock);
        return 0;
 }
 
@@ -308,7 +309,7 @@ scan_boardinfo(struct spi_master *master)
        struct boardinfo        *bi;
        struct device           *dev = master->cdev.dev;
 
-       down(&board_lock);
+       mutex_lock(&board_lock);
        list_for_each_entry(bi, &board_list, list) {
                struct spi_board_info   *chip = bi->board_info;
                unsigned                n;
@@ -330,7 +331,7 @@ scan_boardinfo(struct spi_master *master)
                        (void) spi_new_device(master, chip);
                }
        }
-       up(&board_lock);
+       mutex_unlock(&board_lock);
 }
 
 /*-------------------------------------------------------------------------*/