nvram: Drop the BKL from nvram_open()

It's safe to remove the BKL from nvram_open(): there's no open()
versus read() races: nvram_init() is very simple and race-free,
it registers the device then puts it into /proc - there's no
state init to race with.

Cc: Wim Van Sebroeck <wim@iguana.be>
Cc: Al Viro <viro@zeniv.linux.org.uk>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
LKML-Reference: <1255116426-7270-1-git-send-email-fweisbec@gmail.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

diff --git a/drivers/char/nvram.c b/drivers/char/nvram.c
index 2100a8f..7cf4518 100644 (file)
--- a/drivers/char/nvram.c
+++ b/drivers/char/nvram.c
@@ -329,14 +329,12 @@ static int nvram_ioctl(struct inode *inode, struct file *file,
 
 static int nvram_open(struct inode *inode, struct file *file)
 {
-       lock_kernel();
        spin_lock(&nvram_state_lock);
 
        if ((nvram_open_cnt && (file->f_flags & O_EXCL)) ||
            (nvram_open_mode & NVRAM_EXCL) ||
            ((file->f_mode & FMODE_WRITE) && (nvram_open_mode & NVRAM_WRITE))) {
                spin_unlock(&nvram_state_lock);
-               unlock_kernel();
                return -EBUSY;
        }
 
@@ -347,7 +345,6 @@ static int nvram_open(struct inode *inode, struct file *file)
        nvram_open_cnt++;
 
        spin_unlock(&nvram_state_lock);
-       unlock_kernel();
 
        return 0;
 }