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  1. 04 3月, 2016 1 次提交
  3. 21 2月, 2016 1 次提交
    • G
      Revert "usb: hub: do not clear BOS field during reset device" · e5bdfd50
      由 Greg Kroah-Hartman 提交于 
      This reverts commit d8f00cd6.

Tony writes:

This upstream commit is causing an oops:
d8f00cd6 ("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: NTony Battersby <tonyb@cybernetics.com>
Cc: Du, Changbin <changbin.du@intel.com>
Signed-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>
      e5bdfd50
  5. 15 2月, 2016 1 次提交
  7. 10 2月, 2016 1 次提交
  9. 07 2月, 2016 1 次提交
  11. 25 1月, 2016 4 次提交
  13. 19 12月, 2015 1 次提交
    • A
      USB: fix invalid memory access in hub_activate() · e50293ef
      由 Alan Stern 提交于 
      Commit 8520f380 ("USB: change hub initialization sleeps to
delayed_work") changed the hub_activate() routine to make part of it
run in a workqueue.  However, the commit failed to take a reference to
the usb_hub structure or to lock the hub interface while doing so.  As
a result, if a hub is plugged in and quickly unplugged before the work
routine can run, the routine will try to access memory that has been
deallocated.  Or, if the hub is unplugged while the routine is
running, the memory may be deallocated while it is in active use.

This patch fixes the problem by taking a reference to the usb_hub at
the start of hub_activate() and releasing it at the end (when the work
is finished), and by locking the hub interface while the work routine
is running.  It also adds a check at the start of the routine to see
if the hub has already been disconnected, in which nothing should be
done.
Signed-off-by: NAlan Stern <stern@rowland.harvard.edu>
Reported-by: NAlexandru Cornea <alexandru.cornea@intel.com>
Tested-by: NAlexandru Cornea <alexandru.cornea@intel.com>
Fixes: 8520f380 ("USB: change hub initialization sleeps to delayed_work")
CC: <stable@vger.kernel.org>
Signed-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>
      e50293ef
  15. 12 12月, 2015 1 次提交
  17. 05 12月, 2015 1 次提交
  19. 02 12月, 2015 3 次提交
    • L
      usb: core: lpm: add sysfs node for usb3 lpm permit · 513072d9
      由 Lu Baolu 提交于 
      USB3 LPM is default on in Linux kernel if both xHCI host controller
and the USB devices declare to be LPM-capable. Unfortunately, some
devices are known to work well with LPM disabled, but to be broken
if LPM is enabled, although it declares the LPM capability.  Users
won't be able to use this kind of devices, until someone puts them
in the kernel blacklist and gets the kernel upgraded.

This patch adds a sysfs node to permit or forbit USB3 LPM U1 or U2
entry for a port. The settings apply to both before and after device
enumeration. Supported values are "0" - neither u1 nor u2 permitted,
"u1" - only u1 is permitted, "u2" - only u2 is permitted, "u1_u2" -
both u1 and u2 are permitted. With this interface, users can use an
LPM-unfriendly USB device on a released Linux kernel.
Signed-off-by: NLu Baolu <baolu.lu@linux.intel.com>
Signed-off-by: NZhuang Jin Can <jin.can.zhuang@intel.com>
Signed-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>
      513072d9
    • L
      usb: core: lpm: fix usb3_hardware_lpm sysfs node · bf5ce5bf
      由 Lu Baolu 提交于 
      Commit 655fe4ef ("usbcore: add sysfs support to xHCI usb3
hardware LPM") introduced usb3_hardware_lpm sysfs node. This
doesn't show the correct status of USB3 U1 and U2 LPM status.

This patch fixes this by replacing usb3_hardware_lpm with two
nodes, usb3_hardware_lpm_u1 (for U1) and usb3_hardware_lpm_u2
(for U2), and recording the U1/U2 LPM status in right places.

This patch should be back-ported to kernels as old as 4.3,
that contains Commit 655fe4ef ("usbcore: add sysfs support
to xHCI usb3 hardware LPM").

Cc: stable@vger.kernel.org
Signed-off-by: NLu Baolu <baolu.lu@linux.intel.com>
Signed-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>
      bf5ce5bf
    • H
      usb: core : hub: Fix BOS 'NULL pointer' kernel panic · 464ad8c4
      由 Hans Yang 提交于 
      When a USB 3.0 mass storage device is disconnected in transporting
state, storage device driver may handle it as a transport error and
reset the device by invoking usb_reset_and_verify_device()
and following could happen:

in usb_reset_and_verify_device():
   udev->bos = NULL;

For U1/U2 enabled devices, driver will disable LPM, and in some
conditions:
   from usb_unlocked_disable_lpm()
    --> usb_disable_lpm()
    --> usb_enable_lpm()
        udev->bos->ss_cap->bU1devExitLat;

And it causes 'NULL pointer' and 'kernel panic':

[  157.976257] Unable to handle kernel NULL pointer dereference
at virtual address 00000010
...
[  158.026400] PC is at usb_enable_link_state+0x34/0x2e0
[  158.031442] LR is at usb_enable_lpm+0x98/0xac
...
[  158.137368] [<ffffffc0006a1cac>] usb_enable_link_state+0x34/0x2e0
[  158.143451] [<ffffffc0006a1fec>] usb_enable_lpm+0x94/0xac
[  158.148840] [<ffffffc0006a20e8>] usb_disable_lpm+0xa8/0xb4
...
[  158.214954] Kernel panic - not syncing: Fatal exception

This commit moves 'udev->bos = NULL' behind usb_unlocked_disable_lpm()
to prevent from NULL pointer access.

Issue can be reproduced by following setup:
1) A SS pen drive behind a SS hub connected to the host.
2) Transporting data between the pen drive and the host.
3) Abruptly disconnect hub and pen drive from host.
4) With a chance it crashes.
Signed-off-by: NHans Yang <hansy@nvidia.com>
Acked-by: NAlan Stern <stern@rowland.harvard.edu>
Cc: stable <stable@vger.kernel.org>
Signed-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>
      464ad8c4
  21. 04 10月, 2015 3 次提交
  23. 15 8月, 2015 2 次提交
  25. 09 8月, 2015 1 次提交
  27. 23 7月, 2015 2 次提交
  29. 31 5月, 2015 1 次提交
    • R
      usb: core: Fix USB 3.0 devices lost in NOTATTACHED state after a hub port reset · fb6d1f7d
      由 Robert Schlabbach 提交于 
      Fix USB 3.0 devices lost in NOTATTACHED state after a hub port reset.

Dissolve the function hub_port_finish_reset() completely and divide the
actions to be taken into those which need to be done after each reset
attempt and those which need to be done after the full procedure is
complete, and place them in the appropriate places in hub_port_reset().
Also, remove an unneeded forward declaration of hub_port_reset().

Verbose Problem Description:

USB 3.0 devices may be "lost for good" during a hub port reset.
This makes Linux unable to boot from USB 3.0 devices in certain
constellations of host controllers and devices, because the USB device is
lost during initialization, preventing the rootfs from being mounted.

The underlying problem is that in the affected constellations, during the
processing inside hub_port_reset(), the hub link state goes from 0 to
SS.inactive after the initial reset, and back to 0 again only after the
following "warm" reset.

However, hub_port_finish_reset() is called after each reset attempt and
sets the state the connected USB device based on the "preliminary" status
of the hot reset to USB_STATE_NOTATTACHED due to SS.inactive, yet when
the following warm reset is complete and hub_port_finish_reset() is
called again, its call to set the device to USB_STATE_DEFAULT is blocked
by usb_set_device_state() which does not allow taking USB devices out of
USB_STATE_NOTATTACHED state.

Thanks to Alan Stern for guiding me to the proper solution and how to
submit it.

Link: http://lkml.kernel.org/r/trinity-25981484-72a9-4d46-bf17-9c1cf9301a31-1432073240136%20()%203capp-gmx-bs27Signed-off-by: NRobert Schlabbach <robert_s@gmx.net>
Cc: stable <stable@vger.kernel.org>
Acked-by: NAlan Stern <stern@rowland.harvard.edu>
Signed-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>
      fb6d1f7d
  31. 10 5月, 2015 1 次提交
  33. 08 5月, 2015 3 次提交
  35. 08 4月, 2015 1 次提交
  37. 09 2月, 2015 1 次提交
  39. 04 2月, 2015 2 次提交
  41. 25 1月, 2015 2 次提交
    • D
      usb: core: hub: modify hub reset logic in hub driver · fbaecff0
      由 Deepak Das 提交于 
      Currently if port power is turned off by user on hub port
using USBDEVFS then port power is turned back ON
by hub driver.
This commit modifies hub reset logic in hub_port_connect() to prevent
hub driver from turning back the port power ON if port is not owned
by kernel.
Signed-off-by: NDeepak Das <deepakdas.linux@gmail.com>
Acked-by: NAlan Stern <stern@rowland.harvard.edu>
Signed-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>
      fbaecff0
    • A
      USB: don't cancel queued resets when unbinding drivers · 524134d4
      由 Alan Stern 提交于 
      The USB stack provides a mechanism for drivers to request an
asynchronous device reset (usb_queue_reset_device()).  The mechanism
uses a work item (reset_ws) embedded in the usb_interface structure
used by the driver, and the reset is carried out by a work queue
routine.

The asynchronous reset can race with driver unbinding.  When this
happens, we try to cancel the queued reset before unbinding the
driver, on the theory that the driver won't care about any resets once
it is unbound.

However, thanks to the fact that lockdep now tracks work queue
accesses, this can provoke a lockdep warning in situations where the
device reset causes another interface's driver to be unbound; see

	http://marc.info/?l=linux-usb&m=141893165203776&w=2

for an example.  The reason is that the work routine for reset_ws in
one interface calls cancel_queued_work() for the reset_ws in another
interface.  Lockdep thinks this might lead to a work routine trying to
cancel itself.  The simplest solution is not to cancel queued resets
when unbinding drivers.

This means we now need to acquire a reference to the usb_interface
when queuing a reset_ws work item and to drop the reference when the
work routine finishes.  We also need to make sure that the
usb_interface structure doesn't outlive its parent usb_device; this
means acquiring and dropping a reference when the interface is created
and destroyed.

In addition, cancelling a queued reset can fail (if the device is in
the middle of an earlier reset), and this can cause usb_reset_device()
to try to rebind an interface that has been deallocated (see
http://marc.info/?l=linux-usb&m=142175717016628&w=2 for details).
Acquiring the extra references prevents this failure.
Signed-off-by: NAlan Stern <stern@rowland.harvard.edu>
Reported-by: NRussell King - ARM Linux <linux@arm.linux.org.uk>
Reported-by: NOlivier Sobrie <olivier@sobrie.be>
Tested-by: NOlivier Sobrie <olivier@sobrie.be>
Cc: stable <stable@vger.kernel.org> # 3.19
Signed-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>
      524134d4
  43. 04 12月, 2014 1 次提交
  45. 04 11月, 2014 4 次提交
  47. 29 9月, 2014 1 次提交