From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1759202AbYEVVfv (ORCPT ); Thu, 22 May 2008 17:35:51 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1764026AbYEVVeu (ORCPT ); Thu, 22 May 2008 17:34:50 -0400 Received: from earthlight.etchedpixels.co.uk ([81.2.110.250]:37309 "EHLO lxorguk.ukuu.org.uk" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1762915AbYEVVes (ORCPT ); Thu, 22 May 2008 17:34:48 -0400 Date: Thu, 22 May 2008 22:22:17 +0100 From: Alan Cox To: linux-kernel@vger.kernel.org, dmitry.torokhov@gmail.com, linux-usb@vger.kernel.org Subject: [PATCH] hiddev: Switch to unlocked_ioctl Message-ID: <20080522222217.3a785487@core> X-Mailer: Claws Mail 3.3.1 (GTK+ 2.12.5; x86_64-redhat-linux-gnu) Organization: Red Hat UK Cyf., Amberley Place, 107-111 Peascod Street, Windsor, Berkshire, SL4 1TE, Y Deyrnas Gyfunol. Cofrestrwyd yng Nghymru a Lloegr o'r rhif cofrestru 3798903 Mime-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Push down the BKL. In some cases compat_ioctl already doesn't take the BKL so we don't either. Some of the locking here seems already dubious and object lifetimes want documenting Signed-off-by: Alan Cox diff --git a/drivers/hid/usbhid/hiddev.c b/drivers/hid/usbhid/hiddev.c index 95cc192..fe4f364 100644 --- a/drivers/hid/usbhid/hiddev.c +++ b/drivers/hid/usbhid/hiddev.c @@ -406,6 +406,7 @@ static noinline int hiddev_ioctl_usage(struct hiddev *hiddev, unsigned int cmd, uref_multi = kmalloc(sizeof(struct hiddev_usage_ref_multi), GFP_KERNEL); if (!uref_multi) return -ENOMEM; + lock_kernel(); uref = &uref_multi->uref; if (cmd == HIDIOCGUSAGES || cmd == HIDIOCSUSAGES) { if (copy_from_user(uref_multi, user_arg, @@ -501,12 +502,15 @@ static noinline int hiddev_ioctl_usage(struct hiddev *hiddev, unsigned int cmd, } goodreturn: + unlock_kernel(); kfree(uref_multi); return 0; fault: + unlock_kernel(); kfree(uref_multi); return -EFAULT; inval: + unlock_kernel(); kfree(uref_multi); return -EINVAL; } @@ -540,7 +544,7 @@ static noinline int hiddev_ioctl_string(struct hiddev *hiddev, unsigned int cmd, return len; } -static int hiddev_ioctl(struct inode *inode, struct file *file, unsigned int cmd, unsigned long arg) +static long hiddev_ioctl(struct file *file, unsigned int cmd, unsigned long arg) { struct hiddev_list *list = file->private_data; struct hiddev *hiddev = list->hiddev; @@ -555,7 +559,10 @@ static int hiddev_ioctl(struct inode *inode, struct file *file, unsigned int cmd struct usbhid_device *usbhid = hid->driver_data; void __user *user_arg = (void __user *)arg; int i; + + /* Called without BKL by compat methods so no BKL taken */ + /* FIXME: Who or what stop this racing with a disconnect ?? */ if (!hiddev->exist) return -EIO; @@ -768,7 +775,7 @@ static const struct file_operations hiddev_fops = { .poll = hiddev_poll, .open = hiddev_open, .release = hiddev_release, - .ioctl = hiddev_ioctl, + .unlocked_ioctl = hiddev_ioctl, .fasync = hiddev_fasync, #ifdef CONFIG_COMPAT .compat_ioctl = hiddev_compat_ioctl,