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| author | Thomas Gleixner <tglx@linutronix.de> | 2009-10-10 15:36:34 (GMT) |
|---|---|---|
| committer | Thomas Gleixner <tglx@linutronix.de> | 2009-10-14 13:35:51 (GMT) |
| commit | d63c489b881707adf9c0b89f771b30a1d78f4197 (patch) | |
| tree | 0faf3ab8027a2e236b56c099fe29d638df553bb4 | |
| parent | df502e389383b219e44819fe757614450d95f297 (diff) | |
| download | linux-d63c489b881707adf9c0b89f771b30a1d78f4197.tar.xz | |
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: Thomas Gleixner <tglx@linutronix.de>
LKML-Reference: <20091010153349.682213670@linutronix.de>
Cc: Jeff Dike <jdike@addtoit.com>
| -rw-r--r-- | arch/um/drivers/mmapper_kern.c | 11 |
1 files changed, 4 insertions, 7 deletions
diff --git a/arch/um/drivers/mmapper_kern.c b/arch/um/drivers/mmapper_kern.c index eb24032..d22f9e5 100644 --- a/arch/um/drivers/mmapper_kern.c +++ b/arch/um/drivers/mmapper_kern.c @@ -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 @@ out: 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; } |