[PATCH 3/4] b43: fix debugfs crash

[Christian Lamparter]

This patch fixes a crash that happens because b43's
debugfs code expects file->f_op to be a pointer to
its own b43_debugfs_fops struct. This is no longer
the case since commit 9fd4dcece43a
("debugfs: prevent access to possibly dead file_operations at file open")

Reviewed-by: Nicolai Stange <nicsta...@gmail.com>
Signed-off-by: Christian Lamparter <chunk...@gmail.com>
---
 drivers/net/wireless/broadcom/b43/debugfs.c | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/drivers/net/wireless/broadcom/b43/debugfs.c 
b/drivers/net/wireless/broadcom/b43/debugfs.c
index b4bcd94..7704638 100644
--- a/drivers/net/wireless/broadcom/b43/debugfs.c
+++ b/drivers/net/wireless/broadcom/b43/debugfs.c
@@ -524,7 +524,8 @@ static ssize_t b43_debugfs_read(struct file *file, char 
__user *userbuf,
                goto out_unlock;
        }
 
-       dfops = container_of(file->f_op, struct b43_debugfs_fops, fops);
+       dfops = container_of(debugfs_real_fops(file),
+                            struct b43_debugfs_fops, fops);
        if (!dfops->read) {
                err = -ENOSYS;
                goto out_unlock;
@@ -585,7 +586,8 @@ static ssize_t b43_debugfs_write(struct file *file,
                goto out_unlock;
        }
 
-       dfops = container_of(file->f_op, struct b43_debugfs_fops, fops);
+       dfops = container_of(debugfs_real_fops(file),
+                            struct b43_debugfs_fops, fops);
        if (!dfops->write) {
                err = -ENOSYS;
                goto out_unlock;
-- 
2.9.3