x86, msr: Use file_inode(), not f_mapping->host

As discussed in [1], exchange f_mapping->host with file_inode().  This
is a bug, but happens to be non-manifest in this case.

[1] http://lkml.kernel.org/r/20131007190357.GA13318@ZenIV.linux.org.uk

Signed-off-by: Andre Richter <andre.o.richter@gmail.com>
Link: http://lkml.kernel.org/r/1381224142-3267-1-git-send-email-andre.o.richter@gmail.com
Signed-off-by: H. Peter Anvin <hpa@linux.intel.com>

diff --git a/arch/x86/kernel/msr.c b/arch/x86/kernel/msr.c
index 88458faea2f8f0ace5ae6d2b02a451bf43a2d9af..05266b5aae22916e864bb21e1399193ff253374e 100644 (file)
--- a/arch/x86/kernel/msr.c
+++ b/arch/x86/kernel/msr.c
@@ -46,7 +46,7 @@ static struct class *msr_class;
 static loff_t msr_seek(struct file *file, loff_t offset, int orig)
 {
        loff_t ret;
-       struct inode *inode = file->f_mapping->host;
+       struct inode *inode = file_inode(file);
 
        mutex_lock(&inode->i_mutex);
        switch (orig) {