提交 d63c489b 编写于 作者: T Thomas Gleixner

um: Remove BKL from mmapper

cycle_kernel_lock() was added during the big BKL pushdown. It should
ensure the serializiation against driver init code.

mmapper_open() cannot be called before misc_register() succeeded, but
p_buf might be uninitialized.

Move the initialization of p_buf before the misc_register() call and
get rid of cycle_kernel_lock().
Signed-off-by: NThomas Gleixner <tglx@linutronix.de>
LKML-Reference: <20091010153349.682213670@linutronix.de>
Cc: Jeff Dike <jdike@addtoit.com>
上级 df502e38
......@@ -16,7 +16,7 @@
#include <linux/miscdevice.h>
#include <linux/module.h>
#include <linux/mm.h>
#include <linux/smp_lock.h>
#include <asm/uaccess.h>
#include "mem_user.h"
......@@ -78,7 +78,6 @@ static int mmapper_mmap(struct file *file, struct vm_area_struct *vma)
static int mmapper_open(struct inode *inode, struct file *file)
{
cycle_kernel_lock();
return 0;
}
......@@ -115,18 +114,16 @@ static int __init mmapper_init(void)
v_buf = (char *) find_iomem("mmapper", &mmapper_size);
if (mmapper_size == 0) {
printk(KERN_ERR "mmapper_init - find_iomem failed\n");
goto out;
return -ENODEV;
}
p_buf = __pa(v_buf);
err = misc_register(&mmapper_dev);
if (err) {
printk(KERN_ERR "mmapper - misc_register failed, err = %d\n",
err);
goto out;
return err;;
}
p_buf = __pa(v_buf);
out:
return 0;
}
......
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