diff options
| -rw-r--r-- | fs/ioctl.c | 14 |
1 files changed, 11 insertions, 3 deletions
diff --git a/fs/ioctl.c b/fs/ioctl.c index 479c1038ed4..8c90cbc903f 100644 --- a/fs/ioctl.c +++ b/fs/ioctl.c @@ -12,6 +12,7 @@ #include <linux/fs.h> #include <linux/security.h> #include <linux/module.h> +#include <linux/kallsyms.h> #include <asm/uaccess.h> #include <asm/ioctls.h> @@ -20,6 +21,7 @@ static long do_ioctl(struct file *filp, unsigned int cmd, unsigned long arg) { int error = -ENOTTY; + void *f; if (!filp->f_op) goto out; @@ -29,10 +31,16 @@ static long do_ioctl(struct file *filp, unsigned int cmd, if (error == -ENOIOCTLCMD) error = -EINVAL; goto out; - } else if (filp->f_op->ioctl) { + } else if ((f = filp->f_op->ioctl)) { lock_kernel(); - error = filp->f_op->ioctl(filp->f_path.dentry->d_inode, - filp, cmd, arg); + if (!filp->f_op->ioctl) { + printk("%s: ioctl %p disappeared\n", __FUNCTION__, f); + print_symbol("symbol: %s\n", (unsigned long)f); + dump_stack(); + } else { + error = filp->f_op->ioctl(filp->f_path.dentry->d_inode, + filp, cmd, arg); + } unlock_kernel(); } |