From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1757732Ab0CaA2w (ORCPT ); Tue, 30 Mar 2010 20:28:52 -0400 Received: from kroah.org ([198.145.64.141]:48903 "EHLO coco.kroah.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1756425Ab0C3XMU (ORCPT ); Tue, 30 Mar 2010 19:12:20 -0400 X-Mailbox-Line: From linux@linux.site Tue Mar 30 15:58:28 2010 Message-Id: <20100330225827.532233393@linux.site> User-Agent: quilt/0.47-14.9 Date: Tue, 30 Mar 2010 15:57:33 -0700 From: Greg KH To: linux-kernel@vger.kernel.org, stable@kernel.org Cc: stable-review@kernel.org, torvalds@linux-foundation.org, akpm@linux-foundation.org, alan@lxorguk.ukuu.org.uk, Oliver Neukum , Alan Stern , Greg Kroah-Hartman Subject: [31/89] USB: Dont use GFP_KERNEL while we cannot reset a storage device In-Reply-To: <20100330230520.GA28779@kroah.com> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org 2.6.31-stable review patch. If anyone has any objections, please let us know. ------------------ From: Oliver Neukum commit acbe2febe71abb2360b008e9ab3ee5c44169f78c upstream. Memory allocations with GFP_KERNEL can cause IO to a storage device which can fail resulting in a need to reset the device. Therefore GFP_KERNEL cannot be safely used between usb_lock_device() and usb_unlock_device(). Replace by GFP_NOIO. Signed-off-by: Oliver Neukum Cc: Alan Stern Signed-off-by: Greg Kroah-Hartman --- drivers/usb/core/devices.c | 2 +- drivers/usb/core/message.c | 8 ++++---- 2 files changed, 5 insertions(+), 5 deletions(-) --- a/drivers/usb/core/devices.c +++ b/drivers/usb/core/devices.c @@ -494,7 +494,7 @@ static ssize_t usb_device_dump(char __us return 0; /* allocate 2^1 pages = 8K (on i386); * should be more than enough for one device */ - pages_start = (char *)__get_free_pages(GFP_KERNEL, 1); + pages_start = (char *)__get_free_pages(GFP_NOIO, 1); if (!pages_start) return -ENOMEM; --- a/drivers/usb/core/message.c +++ b/drivers/usb/core/message.c @@ -923,11 +923,11 @@ char *usb_cache_string(struct usb_device if (index <= 0) return NULL; - buf = kmalloc(MAX_USB_STRING_SIZE, GFP_KERNEL); + buf = kmalloc(MAX_USB_STRING_SIZE, GFP_NOIO); if (buf) { len = usb_string(udev, index, buf, MAX_USB_STRING_SIZE); if (len > 0) { - smallbuf = kmalloc(++len, GFP_KERNEL); + smallbuf = kmalloc(++len, GFP_NOIO); if (!smallbuf) return buf; memcpy(smallbuf, buf, len); @@ -1694,7 +1694,7 @@ int usb_set_configuration(struct usb_dev if (cp) { nintf = cp->desc.bNumInterfaces; new_interfaces = kmalloc(nintf * sizeof(*new_interfaces), - GFP_KERNEL); + GFP_NOIO); if (!new_interfaces) { dev_err(&dev->dev, "Out of memory\n"); return -ENOMEM; @@ -1703,7 +1703,7 @@ int usb_set_configuration(struct usb_dev for (; n < nintf; ++n) { new_interfaces[n] = kzalloc( sizeof(struct usb_interface), - GFP_KERNEL); + GFP_NOIO); if (!new_interfaces[n]) { dev_err(&dev->dev, "Out of memory\n"); ret = -ENOMEM;