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Revert "usb: hub: do not clear BOS field during reset device"

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This reverts commit d8f00cd685.

Tony writes:

This upstream commit is causing an oops:
d8f00cd685 ("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@cybernetics.com>
Cc: Du, Changbin <changbin.du@intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Greg Kroah-Hartman 2016-02-20 14:19:34 -08:00
parent f9a96d2e7e
commit e5bdfd50d6
1 changed files with 3 additions and 5 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

8
drivers/usb/core/hub.c
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@ -5401,6 +5401,7 @@ static int usb_reset_and_verify_device(struct usb_device *udev)
}
bos = udev->bos;
udev->bos = NULL;
for (i = 0; i < SET_CONFIG_TRIES; ++i) {
@ -5493,11 +5494,8 @@ 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;
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