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Yu Chen 80e457699a usb: xhci: fix panic in xhci_free_virt_devices_depth_first 
Check vdev->real_port 0 to avoid panic
[    9.261347] [<ffffff800884a390>] xhci_free_virt_devices_depth_first+0x58/0x108
[    9.261352] [<ffffff800884a814>] xhci_mem_cleanup+0x1bc/0x570
[    9.261355] [<ffffff8008842de8>] xhci_stop+0x140/0x1c8
[    9.261365] [<ffffff80087ed304>] usb_remove_hcd+0xfc/0x1d0
[    9.261369] [<ffffff80088551c4>] xhci_plat_remove+0x6c/0xa8
[    9.261377] [<ffffff80086e928c>] platform_drv_remove+0x2c/0x70
[    9.261384] [<ffffff80086e6ea0>] __device_release_driver+0x80/0x108
[    9.261387] [<ffffff80086e7a1c>] device_release_driver+0x2c/0x40
[    9.261392] [<ffffff80086e5f28>] bus_remove_device+0xe0/0x120
[    9.261396] [<ffffff80086e2e34>] device_del+0x114/0x210
[    9.261399] [<ffffff80086e9e00>] platform_device_del+0x30/0xa0
[    9.261403] [<ffffff8008810bdc>] dwc3_otg_work+0x204/0x488
[    9.261407] [<ffffff80088133fc>] event_work+0x304/0x5b8
[    9.261414] [<ffffff80080e31b0>] process_one_work+0x148/0x490
[    9.261417] [<ffffff80080e3548>] worker_thread+0x50/0x4a0
[    9.261421] [<ffffff80080e9ea0>] kthread+0xe8/0x100
[    9.261427] [<ffffff8008083680>] ret_from_fork+0x10/0x50

The problem can occur if xhci_plat_remove() is called shortly after
xhci_plat_probe(). While xhci_free_virt_devices_depth_first been
called before the device has been setup and get real_port initialized.
The problem occurred on Hikey960 and was reproduced by Guenter Roeck
on Kevin with chromeos-4.4.

Fixes: ee8665e28e ("xhci: free xhci virtual devices with leaf nodes first")
Cc: Guenter Roeck <groeck@google.com>
Cc: <stable@vger.kernel.org> # v4.10+
Reviewed-by: Guenter Roeck <groeck@chromium.org>
Tested-by: Guenter Roeck <linux@roeck-us.net>
Signed-off-by: Fan Ning <fanning4@hisilicon.com>
Signed-off-by: Li Rui <lirui39@hisilicon.com>
Signed-off-by: yangdi <yangdi10@hisilicon.com>
Signed-off-by: Yu Chen <chenyu56@huawei.com>
Signed-off-by: Mathias Nyman <mathias.nyman@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
 		2017-12-01 15:24:59 +00:00
..
whci USB: host: whci: Remove redundant license text 2017-11-07 15:45:02 +01:00
Kconfig usb: host: remove ehci-msm.c 2017-11-01 17:05:51 +01:00
Makefile USB/PHY patches for 4.15-rc1 2017-11-13 21:14:07 -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: host: ehci: Remove redundant license text 2017-11-07 15:45:02 +01:00
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: ehci: Remove redundant license text 2017-11-07 15:45:02 +01:00
ehci-hub.c USB: host: ehci: Remove redundant license text 2017-11-07 15:45:02 +01:00
ehci-mem.c USB: host: ehci: Remove redundant license text 2017-11-07 15:45:02 +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: host: ehci: Remove redundant license text 2017-11-07 15:45:02 +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: Remove redundant license text 2017-11-07 15:45:02 +01:00
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: Remove redundant license text 2017-11-07 15:45:02 +01:00
ehci-sched.c USB: host: ehci: Remove redundant license text 2017-11-07 15:45:02 +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 USB: host: ehci: Remove redundant license text 2017-11-07 15:45:02 +01:00
ehci-sysfs.c USB: host: ehci: Remove redundant license text 2017-11-07 15:45:02 +01:00
ehci-tegra.c USB: host: ehci: Remove redundant license text 2017-11-07 15:45:02 +01:00
ehci-tilegx.c USB: host: ehci: Remove redundant license text 2017-11-07 15:45:02 +01:00
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: Remove redundant license text 2017-11-07 15:45:02 +01:00
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: host: Remove redundant license text 2017-11-07 15:45:02 +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: Remove redundant license text 2017-11-07 15:45:02 +01:00
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: add SPDX identifiers to all remaining files in drivers/usb/ 2017-11-04 11:48:02 +01:00
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 License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +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: host: ohci: Remove redundant license text 2017-11-07 15:45:02 +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 treewide: setup_timer() -> timer_setup() 2017-11-21 15:57:07 -08:00
ohci-hub.c USB: add SPDX identifiers to all remaining files in drivers/usb/ 2017-11-04 11:48:02 +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 SPDX identifiers to all remaining files in drivers/usb/ 2017-11-04 11:48:02 +01:00
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: Remove redundant license text 2017-11-07 15:45:02 +01:00
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: add SPDX identifiers to all remaining files in drivers/usb/ 2017-11-04 11:48:02 +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-tilegx.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 USB: add SPDX identifiers to all remaining files in drivers/usb/ 2017-11-04 11:48:02 +01:00
pci-quirks.h License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +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-hcd.c treewide: setup_timer() -> timer_setup() 2017-11-21 15:57:07 -08:00
sl811.h License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
sl811_cs.c USB: add SPDX identifiers to all remaining files in drivers/usb/ 2017-11-04 11:48:02 +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 treewide: setup_timer() -> timer_setup() 2017-11-21 15:57:07 -08:00
uhci-hcd.h Merge branch 'linus' into locking/core, to resolve conflicts 2017-11-07 10:32:44 +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 License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
uhci-q.c treewide: setup_timer() -> timer_setup() 2017-11-21 15:57:07 -08:00
xhci-dbg.c USB: host: xhci: Remove redundant license text 2017-11-07 15:45:02 +01:00
xhci-debugfs.c USB: host: xhci-debugfs: add SPDX lines 2017-11-07 15:53:48 +01:00
xhci-debugfs.h USB: host: xhci-debugfs: add SPDX lines 2017-11-07 15:53:48 +01:00
xhci-ext-caps.h USB: host: xhci: Remove redundant license text 2017-11-07 15:45:02 +01:00
xhci-hub.c USB: host: xhci: Remove redundant license text 2017-11-07 15:45:02 +01:00
xhci-mem.c usb: xhci: fix panic in xhci_free_virt_devices_depth_first 2017-12-01 15:24:59 +00:00
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: Remove redundant license text 2017-11-07 15:45:02 +01:00
xhci-mtk.h USB: host: xhci: Remove redundant license text 2017-11-07 15:45:02 +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 USB: host: xhci: Remove redundant license text 2017-11-07 15:45:02 +01:00
xhci-plat.c USB: host: xhci: Remove redundant license text 2017-11-07 15:45:02 +01:00
xhci-plat.h USB: host: xhci: Remove redundant license text 2017-11-07 15:45:02 +01:00
xhci-rcar.c USB: host: xhci: Remove redundant license text 2017-11-07 15:45:02 +01:00
xhci-rcar.h USB: host: xhci: Remove redundant license text 2017-11-07 15:45:02 +01:00
xhci-ring.c xhci: Don't show incorrect WARN message about events for empty rings 2017-12-01 15:24:58 +00:00
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 USB: host: xhci: Remove redundant license text 2017-11-07 15:45:02 +01:00
xhci.c treewide: setup_timer() -> timer_setup() 2017-11-21 15:57:07 -08:00
xhci.h USB: host: xhci: Remove redundant license text 2017-11-07 15:45:02 +01:00