4.4-stable review patch. If anyone has any objections, please let me know.
------------------
From: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
commit e5bdfd50d6f76077bf8441d130c606229e100d40 upstream.
This reverts commit d8f00cd685f5c8e0def8593e520a7fef12c22407.
Tony writes:
This upstream commit is causing an oops:
d8f00cd685f5 ("usb: hub: do not clear BOS field during reset device")
This patch has already been included in several -stable kernels. Here
are the affected kernels:
4.5.0-rc4 (current git)
4.4.2
4.3.6 (currently in review)
4.1.18
3.18.27
3.14.61
How to reproduce the problem:
Boot kernel with slub debugging enabled (otherwise memory corruption
will cause random oopses later instead of immediately)
Plug in USB 3.0 disk to xhci USB 3.0 port
dd if=/dev/sdc of=/dev/null bs=65536
(where /dev/sdc is the USB 3.0 disk)
Unplug USB cable while dd is still going
Oops is immediate:
Reported-by: Tony Battersby <tonyb@xxxxxxxxxxxxxxx>
Cc: Du, Changbin <changbin.du@xxxxxxxxx>
Cc: Roger Quadros <rogerq@xxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/usb/core/hub.c | 8 +++-----
1 file changed, 3 insertions(+), 5 deletions(-)
--- a/drivers/usb/core/hub.c
+++ b/drivers/usb/core/hub.c
@@ -5392,6 +5392,7 @@ static int usb_reset_and_verify_device(s
}
bos = udev->bos;
+ udev->bos = NULL;
for (i = 0; i < SET_CONFIG_TRIES; ++i) {
@@ -5484,11 +5485,8 @@ done:
usb_set_usb2_hardware_lpm(udev, 1);
usb_unlocked_enable_lpm(udev);
usb_enable_ltm(udev);
- /* release the new BOS descriptor allocated by hub_port_init() */
- if (udev->bos != bos) {
- usb_release_bos_descriptor(udev);
- udev->bos = bos;
- }
+ usb_release_bos_descriptor(udev);
+ udev->bos = bos;
return 0;
re_enumerate:
--
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