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authorH. Peter Anvin <hpa@zytor.com>2008-02-04 16:47:59 +0100
committerIngo Molnar <mingo@elte.hu>2008-02-04 16:47:59 +0100
commit2b06ac867176d5d24757bda7e13f6255d6b96d7b (patch)
tree3a9b1e802b46dfc494f50031e51d118724bf9fa6 /arch/x86/kernel/msr.c
parent2347d933b158932cf2b8aeebae3e5cc16b200bd1 (diff)
downloadblackbird-op-linux-2b06ac867176d5d24757bda7e13f6255d6b96d7b.tar.gz
blackbird-op-linux-2b06ac867176d5d24757bda7e13f6255d6b96d7b.zip
x86: cpuid, msr: use inode mutex instead of big kernel lock
Instead of grabbing the BKL on seek, use the inode mutex in the style of generic_file_llseek(). Signed-off-by: H. Peter Anvin <hpa@zytor.com> Signed-off-by: Ingo Molnar <mingo@elte.hu> Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Diffstat (limited to 'arch/x86/kernel/msr.c')
-rw-r--r--arch/x86/kernel/msr.c14
1 files changed, 9 insertions, 5 deletions
diff --git a/arch/x86/kernel/msr.c b/arch/x86/kernel/msr.c
index bd82850e6519..af51ea8400b2 100644
--- a/arch/x86/kernel/msr.c
+++ b/arch/x86/kernel/msr.c
@@ -1,6 +1,6 @@
/* ----------------------------------------------------------------------- *
- *
- * Copyright 2000 H. Peter Anvin - All Rights Reserved
+ *
+ * Copyright 2000-2008 H. Peter Anvin - All Rights Reserved
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
@@ -45,9 +45,10 @@ static struct class *msr_class;
static loff_t msr_seek(struct file *file, loff_t offset, int orig)
{
- loff_t ret = -EINVAL;
+ loff_t ret;
+ struct inode *inode = file->f_mapping->host;
- lock_kernel();
+ mutex_lock(&inode->i_mutex);
switch (orig) {
case 0:
file->f_pos = offset;
@@ -56,8 +57,11 @@ static loff_t msr_seek(struct file *file, loff_t offset, int orig)
case 1:
file->f_pos += offset;
ret = file->f_pos;
+ break;
+ default:
+ ret = -EINVAL;
}
- unlock_kernel();
+ mutex_unlock(&inode->i_mutex);
return ret;
}
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