cycle_kernel_lock() was added during the big BKL pushdown. It should ensure the serializiation against driver init code. tb0219_base is initialized before the character device is registered, but the spinlock is not initialized. Initialize the spinlock statically and remove cycle_kernel_lock(). Signed-off-by: Thomas Gleixner Cc: Yoichi Yuasa Cc: Ralf Baechle --- drivers/char/tb0219.c | 6 +----- 1 file changed, 1 insertion(+), 5 deletions(-) Index: linux-2.6-tip/drivers/char/tb0219.c =================================================================== --- linux-2.6-tip.orig/drivers/char/tb0219.c +++ linux-2.6-tip/drivers/char/tb0219.c @@ -21,7 +21,6 @@ #include #include #include -#include #include #include @@ -38,7 +37,7 @@ MODULE_PARM_DESC(major, "Major device nu static void (*old_machine_restart)(char *command); static void __iomem *tb0219_base; -static spinlock_t tb0219_lock; +static DEFINE_SPINLOCK(tb0219_lock); #define tb0219_read(offset) readw(tb0219_base + (offset)) #define tb0219_write(offset, value) writew((value), tb0219_base + (offset)) @@ -237,7 +236,6 @@ static int tanbac_tb0219_open(struct ino { unsigned int minor; - cycle_kernel_lock(); minor = iminor(inode); switch (minor) { case 0: @@ -306,8 +304,6 @@ static int __devinit tb0219_probe(struct return retval; } - spin_lock_init(&tb0219_lock); - old_machine_restart = _machine_restart; _machine_restart = tb0219_restart; -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/