lp: move compat_ioctl handling into lp.c

Handling for LPSETTIMEOUT can easily be done in lp_ioctl, which
is the only user. As a positive side-effect, push the BKL
into the ioctl methods.

Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Acked-by: Greg Kroah-Hartman <gregkh@suse.de>

1 files changed, 89 insertions, 26 deletions

diff --git a/drivers/char/lp.c b/drivers/char/lp.c
index e444c2dba160..938a3a273886 100644
--- a/drivers/char/lp.c
+++ b/drivers/char/lp.c
@@ -127,6 +127,7 @@
 #include <linux/wait.h>
 #include <linux/jiffies.h>
 #include <linux/smp_lock.h>
+#include <linux/compat.h>
 
 #include <linux/parport.h>
 #undef LP_STATS
@@ -571,13 +572,11 @@ static int lp_release(struct inode * inode, struct file * file)
         return 0;
 }
 
-static int lp_ioctl(struct inode *inode, struct file *file,
-                    unsigned int cmd, unsigned long arg)
+static int lp_do_ioctl(unsigned int minor, unsigned int cmd,
+        unsigned long arg, void __user *argp)
 {
-        unsigned int minor = iminor(inode);
         int status;
         int retval = 0;
-        void __user *argp = (void __user *)arg;
 
 #ifdef LP_DEBUG
         printk(KERN_DEBUG "lp%d ioctl, cmd: 0x%x, arg: 0x%lx\n", minor, cmd, arg);
@@ -587,9 +586,6 @@ static int lp_ioctl(struct inode *inode, struct file *file,
         if ((LP_F(minor) & LP_EXIST) == 0)
                 return -ENODEV;
         switch ( cmd ) {
-                struct timeval par_timeout;
-                long to_jiffies;
-
                 case LPTIME:
                         LP_TIME(minor) = arg * HZ/100;
                         break;
@@ -652,34 +648,101 @@ static int lp_ioctl(struct inode *inode, struct file *file,
                                 return -EFAULT;
                         break;
 
-                case LPSETTIMEOUT:
-                        if (copy_from_user (&par_timeout, argp,
-                                            sizeof (struct timeval))) {
-                                return -EFAULT;
-                        }
-                        /* Convert to jiffies, place in lp_table */
-                        if ((par_timeout.tv_sec < 0) ||
-                            (par_timeout.tv_usec < 0)) {
-                                return -EINVAL;
-                        }
-                        to_jiffies = DIV_ROUND_UP(par_timeout.tv_usec, 1000000/HZ);
-                        to_jiffies += par_timeout.tv_sec * (long) HZ;
-                        if (to_jiffies <= 0) {
-                                return -EINVAL;
-                        }
-                        lp_table[minor].timeout = to_jiffies;
-                        break;
-
                 default:
                         retval = -EINVAL;
         }
         return retval;
 }
 
+static int lp_set_timeout(unsigned int minor, struct timeval *par_timeout)
+{
+        long to_jiffies;
+
+        /* Convert to jiffies, place in lp_table */
+        if ((par_timeout->tv_sec < 0) ||
+            (par_timeout->tv_usec < 0)) {
+                return -EINVAL;
+        }
+        to_jiffies = DIV_ROUND_UP(par_timeout->tv_usec, 1000000/HZ);
+        to_jiffies += par_timeout->tv_sec * (long) HZ;
+        if (to_jiffies <= 0) {
+                return -EINVAL;
+        }
+        lp_table[minor].timeout = to_jiffies;
+        return 0;
+}
+
+static long lp_ioctl(struct file *file, unsigned int cmd,
+                        unsigned long arg)
+{
+        unsigned int minor;
+        struct timeval par_timeout;
+        int ret;
+
+        minor = iminor(file->f_path.dentry->d_inode);
+        lock_kernel();
+        switch (cmd) {
+        case LPSETTIMEOUT:
+                if (copy_from_user(&par_timeout, (void __user *)arg,
+                                        sizeof (struct timeval))) {
+                        ret = -EFAULT;
+                        break;
+                }
+                ret = lp_set_timeout(minor, &par_timeout);
+                break;
+        default:
+                ret = lp_do_ioctl(minor, cmd, arg, (void __user *)arg);
+                break;
+        }
+        unlock_kernel();
+
+        return ret;
+}
+
+#ifdef CONFIG_COMPAT
+static long lp_compat_ioctl(struct file *file, unsigned int cmd,
+                        unsigned long arg)
+{
+        unsigned int minor;
+        struct timeval par_timeout;
+        struct compat_timeval __user *tc;
+        int ret;
+
+        minor = iminor(file->f_path.dentry->d_inode);
+        lock_kernel();
+        switch (cmd) {
+        case LPSETTIMEOUT:
+                tc = compat_ptr(arg);
+                if (get_user(par_timeout.tv_sec, &tc->tv_sec) ||
+                    get_user(par_timeout.tv_usec, &tc->tv_usec)) {
+                        ret = -EFAULT;
+                        break;
+                }
+                ret = lp_set_timeout(minor, &par_timeout);
+                break;
+#ifdef LP_STATS
+        case LPGETSTATS:
+                /* FIXME: add an implementation if you set LP_STATS */
+                ret = -EINVAL;
+                break;
+#endif
+        default:
+                ret = lp_do_ioctl(minor, cmd, arg, compat_ptr(arg));
+                break;
+        }
+        unlock_kernel();
+
+        return ret;
+}
+#endif
+
 static const struct file_operations lp_fops = {
         .owner          = THIS_MODULE,
         .write          = lp_write,
-        .ioctl          = lp_ioctl,
+        .unlocked_ioctl = lp_ioctl,
+#ifdef CONFIG_COMPAT
+        .compat_ioctl   = lp_compat_ioctl,
+#endif
         .open           = lp_open,
         .release        = lp_release,
 #ifdef CONFIG_PARPORT_1284