sparc: fix PCI device proc file mmap(2)

Commit 786d7e1612f0b0adb6046f19b906609e4fe8b1ba "Fix rmmod/read/write races in /proc entries"
must have broken mmapping of PCI device proc files on Sparc.

Notice how it adds wrapper around ->mmap but doesn't do it around ->get_unmapped_area.
Add wrapper around ->get_unmapped_area.

Signed-off-by: Alexey Dobriyan <adobriyan@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 16 insertions, 0 deletions

diff --git a/fs/proc/inode.c b/fs/proc/inode.c
index 073aea60cf8f..9f8ef9b7674d 100644
--- a/fs/proc/inode.c
+++ b/fs/proc/inode.c
@@ -285,6 +285,20 @@ static int proc_reg_mmap(struct file *file, struct vm_area_struct *vma)
         return rv;
 }
 
+static unsigned long proc_reg_get_unmapped_area(struct file *file, unsigned long orig_addr, unsigned long len, unsigned long pgoff, unsigned long flags)
+{
+        struct proc_dir_entry *pde = PDE(file_inode(file));
+        int rv = -EIO;
+        unsigned long (*get_unmapped_area)(struct file *, unsigned long, unsigned long, unsigned long, unsigned long);
+        if (use_pde(pde)) {
+                get_unmapped_area = pde->proc_fops->get_unmapped_area;
+                if (get_unmapped_area)
+                        rv = get_unmapped_area(file, orig_addr, len, pgoff, flags);
+                unuse_pde(pde);
+        }
+        return rv;
+}
+
 static int proc_reg_open(struct inode *inode, struct file *file)
 {
         struct proc_dir_entry *pde = PDE(inode);
@@ -356,6 +370,7 @@ static const struct file_operations proc_reg_file_ops = {
         .compat_ioctl   = proc_reg_compat_ioctl,
 #endif
         .mmap           = proc_reg_mmap,
+        .get_unmapped_area = proc_reg_get_unmapped_area,
         .open           = proc_reg_open,
         .release        = proc_reg_release,
 };
@@ -368,6 +383,7 @@ static const struct file_operations proc_reg_file_ops_no_compat = {
         .poll           = proc_reg_poll,
         .unlocked_ioctl = proc_reg_unlocked_ioctl,
         .mmap           = proc_reg_mmap,
+        .get_unmapped_area = proc_reg_get_unmapped_area,
         .open           = proc_reg_open,
         .release        = proc_reg_release,
 };