nvram: Drop the bkl from nvram_llseek()

There is nothing to protect inside nvram_llseek(), the file
offset doesn't need to be protected and nvram_len is only
initialized from an __init path.

It's safe to remove the big kernel lock there.

Signed-off-by: Frederic Weisbecker <fweisbec@gmail.com>
LKML-Reference: <1255116030-6929-1-git-send-email-fweisbec@gmail.com>
Cc: Greg KH <gregkh@suse.de>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>

diff --git a/drivers/char/generic_nvram.c b/drivers/char/generic_nvram.c
index ef31738..fda4181 100644 (file)
--- a/drivers/char/generic_nvram.c
+++ b/drivers/char/generic_nvram.c
@@ -19,7 +19,6 @@
 #include <linux/miscdevice.h>
 #include <linux/fcntl.h>
 #include <linux/init.h>
-#include <linux/smp_lock.h>
 #include <asm/uaccess.h>
 #include <asm/nvram.h>
 #ifdef CONFIG_PPC_PMAC
@@ -32,7 +31,6 @@ static ssize_t nvram_len;
 
 static loff_t nvram_llseek(struct file *file, loff_t offset, int origin)
 {
-       lock_kernel();
        switch (origin) {
        case 1:
                offset += file->f_pos;
@@ -41,12 +39,11 @@ static loff_t nvram_llseek(struct file *file, loff_t offset, int origin)
                offset += nvram_len;
                break;
        }
-       if (offset < 0) {
-               unlock_kernel();
+       if (offset < 0)
                return -EINVAL;
-       }
+
        file->f_pos = offset;
-       unlock_kernel();
+
        return file->f_pos;
 }