[PATCH 04/14] USB: Don't use GFP_KERNEL while we cannot reset a storage device

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From: Oliver Neukum <oliver@xxxxxxxxxx>

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 <oliver@xxxxxxxxxx>
Cc: stable <stable@xxxxxxxxxx>
Cc: Alan Stern <stern@xxxxxxxxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxx>
---
 drivers/usb/core/devices.c |    2 +-
 drivers/usb/core/message.c |    8 ++++----
 2 files changed, 5 insertions(+), 5 deletions(-)

diff --git a/drivers/usb/core/devices.c b/drivers/usb/core/devices.c
index 96f1171..355dffc 100644
--- a/drivers/usb/core/devices.c
+++ b/drivers/usb/core/devices.c
@@ -494,7 +494,7 @@ static ssize_t usb_device_dump(char __user **buffer, size_t *nbytes,
 		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;
 
diff --git a/drivers/usb/core/message.c b/drivers/usb/core/message.c
index 1b99484..9bc95fe 100644
--- a/drivers/usb/core/message.c
+++ b/drivers/usb/core/message.c
@@ -906,11 +906,11 @@ char *usb_cache_string(struct usb_device *udev, int index)
 	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);
@@ -1731,7 +1731,7 @@ int usb_set_configuration(struct usb_device *dev, int configuration)
 	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;
@@ -1740,7 +1740,7 @@ int usb_set_configuration(struct usb_device *dev, int configuration)
 		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;
-- 
1.6.5.7

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