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authorJonathan Corbet <corbet@lwn.net>2008-05-15 19:12:01 +0400
committerJonathan Corbet <corbet@lwn.net>2008-05-19 01:43:40 +0400
commit5119e92efc733d730b34f9605a5ae61fdc4bf649 (patch)
tree1262d1ed4d4934d62de6b92e8983d234ed2cda28 /arch/x86/kernel/msr.c
parent1fa984b583a809423ddb1d88fa46484071f85f80 (diff)
downloadlinux-5119e92efc733d730b34f9605a5ae61fdc4bf649.tar.xz
x86: cdev lock_kernel() pushdown
Push the cdev lock_kernel() call down into the x86 msr and cpuid drivers. Signed-off-by: Jonathan Corbet <corbet@lwn.net>
Diffstat (limited to 'arch/x86/kernel/msr.c')
-rw-r--r--arch/x86/kernel/msr.c16
1 files changed, 12 insertions, 4 deletions
diff --git a/arch/x86/kernel/msr.c b/arch/x86/kernel/msr.c
index 1f3abe048e93..a153b3905f60 100644
--- a/arch/x86/kernel/msr.c
+++ b/arch/x86/kernel/msr.c
@@ -117,12 +117,20 @@ static int msr_open(struct inode *inode, struct file *file)
{
unsigned int cpu = iminor(file->f_path.dentry->d_inode);
struct cpuinfo_x86 *c = &cpu_data(cpu);
+ int ret = 0;
- if (cpu >= NR_CPUS || !cpu_online(cpu))
- return -ENXIO; /* No such CPU */
- if (!cpu_has(c, X86_FEATURE_MSR))
- return -EIO; /* MSR not supported */
+ lock_kernel();
+ cpu = iminor(file->f_path.dentry->d_inode);
+ if (cpu >= NR_CPUS || !cpu_online(cpu)) {
+ ret = -ENXIO; /* No such CPU */
+ goto out;
+ }
+ c = &cpu_data(cpu);
+ if (!cpu_has(c, X86_FEATURE_MSR))
+ ret = -EIO; /* MSR not supported */
+out:
+ unlock_kernel();
return 0;
}