pci: write file size to inode on proc bus file write

When a /proc/bus/pci file is written to, the size of that PCI device's
configuration space must be written to the inode.  Otherwise, it is
possible for the file to specify a size of 0 on stat if a task is holding
the same file open.

Signed-off-by: David Rientjes <rientjes@google.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

1 files changed, 2 insertions, 1 deletions

diff --git a/drivers/pci/proc.c b/drivers/pci/proc.c
index 73714db6995e..716439e25dd2 100644
--- a/drivers/pci/proc.c
+++ b/drivers/pci/proc.c
@@ -129,7 +129,7 @@ proc_bus_pci_read(struct file *file, char __user *buf, size_t nbytes, loff_t *pp
 static ssize_t
 proc_bus_pci_write(struct file *file, const char __user *buf, size_t nbytes, loff_t *ppos)
 {
-        const struct inode *ino = file->f_path.dentry->d_inode;
+        struct inode *ino = file->f_path.dentry->d_inode;
         const struct proc_dir_entry *dp = PDE(ino);
         struct pci_dev *dev = dp->data;
         int pos = *ppos;
@@ -193,6 +193,7 @@ proc_bus_pci_write(struct file *file, const char __user *buf, size_t nbytes, lof
         }
 
         *ppos = pos;
+        i_size_write(ino, dp->size);
         return nbytes;
 }