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Zhengjun Xing 7fc65d4c2b xhci: Fix Kernel oops in xhci dbgtty 
tty_unregister_driver may be called more than 1 time in some
hotplug cases,it will cause the kernel oops. This patch checked
dbc_tty_driver to make sure it is unregistered only 1 time.

[  175.741404] BUG: unable to handle kernel NULL pointer dereference at 0000000000000034
[  175.742309] IP: tty_unregister_driver+0x9/0x70
[  175.743148] PGD 0 P4D 0
[  175.743981] Oops: 0000 [#1] SMP PTI
[  175.753904] RIP: 0010:tty_unregister_driver+0x9/0x70
[  175.754817] RSP: 0018:ffffa8ff831d3bb0 EFLAGS: 00010246
[  175.755753] RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000
[  175.756685] RDX: ffff92089c616000 RSI: ffffe64fe1b26080 RDI: 0000000000000000
[  175.757608] RBP: ffff92086c988230 R08: 000000006c982701 R09: 00000001801e0016
[  175.758533] R10: ffffa8ff831d3b48 R11: ffff92086c982100 R12: ffff92086c98827c
[  175.759462] R13: ffff92086c988398 R14: 0000000000000060 R15: ffff92089c5e9b40
[  175.760401] FS:  0000000000000000(0000) GS:ffff9208a0100000(0000) knlGS:0000000000000000
[  175.761334] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[  175.762270] CR2: 0000000000000034 CR3: 000000011800a003 CR4: 00000000003606e0
[  175.763225] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[  175.764164] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
[  175.765091] Call Trace:
[  175.766014]  xhci_dbc_tty_unregister_driver+0x11/0x30
[  175.766960]  xhci_dbc_exit+0x2a/0x40
[  175.767889]  xhci_stop+0x57/0x1c0
[  175.768824]  usb_remove_hcd+0x100/0x250
[  175.769708]  usb_hcd_pci_remove+0x68/0x130
[  175.770574]  pci_device_remove+0x3b/0xc0
[  175.771435]  device_release_driver_internal+0x157/0x230
[  175.772343]  pci_stop_bus_device+0x74/0xa0
[  175.773205]  pci_stop_bus_device+0x2b/0xa0
[  175.774061]  pci_stop_bus_device+0x2b/0xa0
[  175.774907]  pci_stop_bus_device+0x2b/0xa0
[  175.775741]  pci_stop_bus_device+0x2b/0xa0
[  175.776618]  pci_stop_bus_device+0x2b/0xa0
[  175.777452]  pci_stop_bus_device+0x2b/0xa0
[  175.778273]  pci_stop_bus_device+0x2b/0xa0
[  175.779092]  pci_stop_bus_device+0x2b/0xa0
[  175.779908]  pci_stop_bus_device+0x2b/0xa0
[  175.780750]  pci_stop_bus_device+0x2b/0xa0
[  175.781543]  pci_stop_and_remove_bus_device+0xe/0x20
[  175.782338]  pciehp_unconfigure_device+0xb8/0x160
[  175.783128]  pciehp_disable_slot+0x4f/0xd0
[  175.783920]  pciehp_power_thread+0x82/0xa0
[  175.784766]  process_one_work+0x147/0x3c0
[  175.785564]  worker_thread+0x4a/0x440
[  175.786376]  kthread+0xf8/0x130
[  175.787174]  ? rescuer_thread+0x360/0x360
[  175.787964]  ? kthread_associate_blkcg+0x90/0x90
[  175.788798]  ret_from_fork+0x35/0x40

Cc: <stable@vger.kernel.org> # 4.16
Fixes: dfba2174dc42 ("usb: xhci: Add DbC support in xHCI driver")
Signed-off-by: Zhengjun Xing <zhengjun.xing@linux.intel.com>
Tested-by: Christian Kellner <christian@kellner.me>
Reviewed-by: Christian Kellner <christian@kellner.me>
Signed-off-by: Mathias Nyman <mathias.nyman@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2018-04-22 15:23:37 +02:00
..
whci
USB: host: whci: Re-use DEFINE_SHOW_ATTRIBUTE() macro
2018-03-09 09:31:26 -08:00
bcma-hcd.c
USB: host: Remove redundant license text
2017-11-07 15:45:02 +01:00
ehci-atmel.c
USB: host: ehci: Remove redundant license text
2017-11-07 15:45:02 +01:00
ehci-dbg.c
usb: host: fix incorrect updating of offset
2017-11-28 15:17:48 +01:00
ehci-exynos.c
USB: host: ehci: Remove redundant license text
2017-11-07 15:45:02 +01:00
ehci-fsl.c
usb: add a flag to skip PHY initialization to struct usb_hcd
2018-03-09 09:43:52 -08:00
ehci-fsl.h
USB: host: ehci: Remove redundant license text
2017-11-07 15:45:02 +01:00
ehci-grlib.c
USB: host: ehci: Remove redundant license text
2017-11-07 15:45:02 +01:00
ehci-hcd.c
usb: host: remove tilegx platform glue
2018-03-26 15:57:10 +02:00
ehci-hub.c
usb: host: ehci: use correct device pointer for dma ops
2018-02-15 18:43:57 +01:00
ehci-mem.c
usb: host: ehci: Use dma_pool_zalloc()
2018-02-22 15:17:05 +01:00
ehci-mv.c
USB: host: ehci: Remove redundant license text
2017-11-07 15:45:02 +01:00
ehci-mxc.c
USB: host: ehci: Remove redundant license text
2017-11-07 15:45:02 +01:00
ehci-omap.c
usb: ehci-omap: don't complain on -EPROBE_DEFER when no PHY found
2018-01-22 15:34:38 +01:00
ehci-orion.c
USB: host: ehci: Remove redundant license text
2017-11-07 15:45:02 +01:00
ehci-pci.c
USB: host: ehci: Remove redundant license text
2017-11-07 15:45:02 +01:00
ehci-platform.c
usb: host: ehci-platform: remove custom USB PHY handling
2018-03-09 09:43:53 -08:00
ehci-pmcmsp.c
USB: host: ehci: Remove redundant license text
2017-11-07 15:45:02 +01:00
ehci-ppc-of.c
USB: add SPDX identifiers to all remaining files in drivers/usb/
2017-11-04 11:48:02 +01:00
ehci-ps3.c
USB: host: ehci: Remove redundant license text
2017-11-07 15:45:02 +01:00
ehci-q.c
usb: host: ehci: always enable interrupt for qtd completion at test mode
2018-02-15 18:45:34 +01:00
ehci-sched.c
usb: host: ehci: Use dma_pool_zalloc()
2018-02-22 15:17:05 +01:00
ehci-sh.c
USB: host: ehci: Remove redundant license text
2017-11-07 15:45:02 +01:00
ehci-spear.c
USB: host: ehci: Remove redundant license text
2017-11-07 15:45:02 +01:00
ehci-st.c
pinctrl: files should directly include apis they use
2018-02-05 09:41:54 -08:00
ehci-sysfs.c
USB: move many drivers to use DEVICE_ATTR_RW
2018-01-24 08:49:51 +01:00
ehci-tegra.c
usb: add a flag to skip PHY initialization to struct usb_hcd
2018-03-09 09:43:52 -08:00
ehci-timer.c
USB: host: ehci: Remove redundant license text
2017-11-07 15:45:02 +01:00
ehci-w90x900.c
USB: host: ehci: Remove redundant license text
2017-11-07 15:45:02 +01:00
ehci-xilinx-of.c
USB: host: ehci: Remove redundant license text
2017-11-07 15:45:02 +01:00
ehci.h
USB: host: ehci: Remove redundant license text
2017-11-07 15:45:02 +01:00
fhci-dbg.c
USB: host: fhci: Re-use DEFINE_SHOW_ATTRIBUTE() macro
2018-03-09 09:31:25 -08:00
fhci-hcd.c
USB: host: fhci: Remove redundant license text
2017-11-07 15:45:02 +01:00
fhci-hub.c
USB: host: fhci: Remove redundant license text
2017-11-07 15:45:02 +01:00
fhci-mem.c
USB: host: fhci: Remove redundant license text
2017-11-07 15:45:02 +01:00
fhci-q.c
USB: host: fhci: Remove redundant license text
2017-11-07 15:45:02 +01:00
fhci-sched.c
USB: host: fhci: Remove redundant license text
2017-11-07 15:45:02 +01:00
fhci-tds.c
USB: host: fhci: Remove redundant license text
2017-11-07 15:45:02 +01:00
fhci.h
USB: host: fhci: Remove redundant license text
2017-11-07 15:45:02 +01:00
fotg210-hcd.c
USB: move many drivers to use DEVICE_ATTR_RW
2018-01-24 08:49:51 +01:00
fotg210.h
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
fsl-mph-dr-of.c
USB: host: Remove redundant license text
2017-11-07 15:45:02 +01:00
hwa-hc.c
USB: host: Remove redundant license text
2017-11-07 15:45:02 +01:00
imx21-dbg.c
USB: host: imx21: Re-use DEFINE_SHOW_ATTRIBUTE() macro
2018-03-09 09:31:26 -08:00
imx21-hcd.c
USB: host: imx21: Remove redundant license text
2017-11-07 15:45:02 +01:00
imx21-hcd.h
USB: host: imx21: Remove redundant license text
2017-11-07 15:45:02 +01:00
isp116x-hcd.c
USB: host: isp116x: Re-use DEFINE_SHOW_ATTRIBUTE() macro
2018-03-09 09:31:26 -08:00
isp116x.h
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
isp1362-hcd.c
usb: host: isp1362-hcd: remove a couple of redundant assignments
2017-11-07 15:52:29 +01:00
isp1362.h
usb: isp1362: remove blackfin arch glue
2018-03-26 15:57:14 +02:00
Kconfig
USB/PHY patches for 4.17-rc1
2018-04-04 17:55:35 -07:00
Makefile
xhci: Add Intel extended cap / otg phy mux handling
2018-03-22 13:40:10 +01:00
max3421-hcd.c
USB: add SPDX identifiers to all remaining files in drivers/usb/
2017-11-04 11:48:02 +01:00
ohci-at91.c
USB: add SPDX identifiers to all remaining files in drivers/usb/
2017-11-04 11:48:02 +01:00
ohci-da8xx.c
USB: ohci: da8xx: remove clk con_id
2018-01-09 16:15:19 +01:00
ohci-dbg.c
USB: add SPDX identifiers to all remaining files in drivers/usb/
2017-11-04 11:48:02 +01:00
ohci-exynos.c
USB: host: ohci: Remove redundant license text
2017-11-07 15:45:02 +01:00
ohci-hcd.c
arch: remove obsolete architecture ports
2018-04-02 20:20:12 -07:00
ohci-hub.c
ohci-hcd: Fix race condition caused by ohci_urb_enqueue() and io_watchdog_func()
2018-02-15 18:43:57 +01:00
ohci-mem.c
USB: add SPDX identifiers to all remaining files in drivers/usb/
2017-11-04 11:48:02 +01:00
ohci-nxp.c
USB: host: ohci: Remove redundant license text
2017-11-07 15:45:02 +01:00
ohci-omap.c
usb: add a flag to skip PHY initialization to struct usb_hcd
2018-03-09 09:43:52 -08:00
ohci-pci.c
USB: add SPDX identifiers to all remaining files in drivers/usb/
2017-11-04 11:48:02 +01:00
ohci-platform.c
usb: host: ohci-platform: remove custom USB PHY handling
2018-03-09 09:43:53 -08:00
ohci-ppc-of.c
USB: add SPDX identifiers to all remaining files in drivers/usb/
2017-11-04 11:48:02 +01:00
ohci-ps3.c
USB: host: ohci: Remove redundant license text
2017-11-07 15:45:02 +01:00
ohci-pxa27x.c
USB: add SPDX identifiers to all remaining files in drivers/usb/
2017-11-04 11:48:02 +01:00
ohci-q.c
usb: ohci: Proper handling of ed_rm_list to handle race condition between usb_kill_urb() and finish_unlinks()
2018-02-15 18:45:34 +01:00
ohci-s3c2410.c
USB: add SPDX identifiers to all remaining files in drivers/usb/
2017-11-04 11:48:02 +01:00
ohci-sa1111.c
USB: add SPDX identifiers to all remaining files in drivers/usb/
2017-11-04 11:48:02 +01:00
ohci-sm501.c
USB: add SPDX identifiers to all remaining files in drivers/usb/
2017-11-04 11:48:02 +01:00
ohci-spear.c
USB: host: ohci: Remove redundant license text
2017-11-07 15:45:02 +01:00
ohci-st.c
USB: host: ohci: Remove redundant license text
2017-11-07 15:45:02 +01:00
ohci-tmio.c
USB: host: ohci: Remove redundant license text
2017-11-07 15:45:02 +01:00
ohci.h
USB: add SPDX identifiers to all remaining files in drivers/usb/
2017-11-04 11:48:02 +01:00
oxu210hp-hcd.c
treewide: setup_timer() -> timer_setup()
2017-11-21 15:57:07 -08:00
oxu210hp.h
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
pci-quirks.c
xhci: workaround for AMD Promontory disabled ports wakeup
2018-02-15 18:36:19 +01:00
pci-quirks.h
xhci: workaround for AMD Promontory disabled ports wakeup
2018-02-15 18:36:19 +01:00
r8a66597-hcd.c
treewide: setup_timer() -> timer_setup()
2017-11-21 15:57:07 -08:00
r8a66597.h
USB: host: Remove redundant license text
2017-11-07 15:45:02 +01:00
sl811_cs.c
USB: add SPDX identifiers to all remaining files in drivers/usb/
2017-11-04 11:48:02 +01:00
sl811-hcd.c
USB: host: sl811: Re-use DEFINE_SHOW_ATTRIBUTE() macro
2018-03-16 15:40:19 +01:00
sl811.h
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
ssb-hcd.c
USB: host: Remove redundant license text
2017-11-07 15:45:02 +01:00
u132-hcd.c
USB: host: Remove redundant license text
2017-11-07 15:45:02 +01:00
uhci-debug.c
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
uhci-grlib.c
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
uhci-hcd.c
USB: host: Use zeroing memory allocator rather than allocator/memset
2018-01-04 17:03:15 +01:00
uhci-hcd.h
usb: uhci: Add clk support to uhci-platform
2018-01-17 15:08:56 +01:00
uhci-hub.c
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
uhci-pci.c
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
uhci-platform.c
usb: uhci: Add clk support to uhci-platform
2018-01-17 15:08:56 +01:00
uhci-q.c
USB: remove the URB_NO_FSBR flag
2017-12-12 13:16:07 +01:00
xhci-dbg.c
usb: xhci: Cleanup printk debug message for ERST
2017-12-08 17:43:52 +01:00
xhci-dbgcap.c
usb: xhci: dbc: Fix lockdep warning
2018-03-08 09:06:53 -08:00
xhci-dbgcap.h
usb: xhci: Add DbC support in xHCI driver
2017-12-08 17:43:52 +01:00
xhci-dbgtty.c
xhci: Fix Kernel oops in xhci dbgtty
2018-04-22 15:23:37 +02:00
xhci-debugfs.c
xhci: Fix NULL pointer in xhci debugfs
2018-02-15 18:36:19 +01:00
xhci-debugfs.h
USB: host: xhci-debugfs: add SPDX lines
2017-11-07 15:53:48 +01:00
xhci-ext-caps.c
xhci: Add Intel extended cap / otg phy mux handling
2018-03-22 13:40:10 +01:00
xhci-ext-caps.h
xhci: Add Intel extended cap / otg phy mux handling
2018-03-22 13:40:10 +01:00
xhci-hub.c
xhci: Don't print a warning when setting link state for disabled ports
2018-02-15 18:36:19 +01:00
xhci-mem.c
xhci: zero usb device slot_id member when disabling and freeing a xhci slot
2018-03-16 15:40:18 +01:00
xhci-mtk-sch.c
USB: host: xhci: Remove redundant license text
2017-11-07 15:45:02 +01:00
xhci-mtk.c
usb: host: xhci-mtk: remove custom USB PHY handling
2018-03-09 09:43:53 -08:00
xhci-mtk.h
usb: xhci-mtk: supports remote wakeup for mt2712 with two xHCI IPs
2018-01-09 16:21:28 +01:00
xhci-mvebu.c
USB: host: xhci: Remove redundant license text
2017-11-07 15:45:02 +01:00
xhci-mvebu.h
USB: host: xhci: Remove redundant license text
2017-11-07 15:45:02 +01:00
xhci-pci.c
xhci: Fix USB ports for Dell Inspiron 5775
2018-04-20 16:24:20 +02:00
xhci-plat.c
Revert "xhci: plat: Register shutdown for xhci_plat"
2018-04-22 14:45:12 +02:00
xhci-plat.h
USB: host: xhci: Remove redundant license text
2017-11-07 15:45:02 +01:00
xhci-rcar.c
usb: host: xhci-rcar: add support for r8a77965
2018-03-08 10:07:44 -08:00
xhci-rcar.h
USB: host: xhci: Remove redundant license text
2017-11-07 15:45:02 +01:00
xhci-ring.c
xhci: Clear the host side toggle manually when endpoint is soft reset
2018-03-16 15:40:19 +01:00
xhci-tegra.c
USB: host: xhci: Remove redundant license text
2017-11-07 15:45:02 +01:00
xhci-trace.c
USB: host: xhci: Remove redundant license text
2017-11-07 15:45:02 +01:00
xhci-trace.h
xhci: add port status tracing for Get Hub Status requests
2017-12-08 17:43:53 +01:00
xhci.c
Merge branch 4.16-rc6 into usb-next
2018-03-20 09:56:08 +01:00
xhci.h
usb: host: xhci-plat: Fix clock resource by adding a register clock
2018-04-20 16:24:20 +02:00