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Kai-Heng Feng ae14443c5b usb: Allow USB device to be warm reset in suspended state commit `e76b3bf765` upstream. On Dell WD15 dock, sometimes USB ethernet cannot be detected after plugging cable to the ethernet port, the hub and roothub get runtime resumed and runtime suspended immediately: ... [ 433.315169] xhci_hcd 0000:3a:00.0: hcd_pci_runtime_resume: 0 [ 433.315204] usb usb4: usb auto-resume [ 433.315226] hub 4-0:1.0: hub_resume [ 433.315239] xhci_hcd 0000:3a:00.0: Get port status 4-1 read: 0x10202e2, return 0x10343 [ 433.315264] usb usb4-port1: status 0343 change 0001 [ 433.315279] xhci_hcd 0000:3a:00.0: clear port1 connect change, portsc: 0x10002e2 [ 433.315293] xhci_hcd 0000:3a:00.0: Get port status 4-2 read: 0x2a0, return 0x2a0 [ 433.317012] xhci_hcd 0000:3a:00.0: xhci_hub_status_data: stopping port polling. [ 433.422282] xhci_hcd 0000:3a:00.0: Get port status 4-1 read: 0x10002e2, return 0x343 [ 433.422307] usb usb4-port1: do warm reset [ 433.422311] usb 4-1: device reset not allowed in state 8 [ 433.422339] hub 4-0:1.0: state 7 ports 2 chg 0002 evt 0000 [ 433.422346] xhci_hcd 0000:3a:00.0: Get port status 4-1 read: 0x10002e2, return 0x343 [ 433.422356] usb usb4-port1: do warm reset [ 433.422358] usb 4-1: device reset not allowed in state 8 [ 433.422428] xhci_hcd 0000:3a:00.0: set port remote wake mask, actual port 0 status = 0xf0002e2 [ 433.422455] xhci_hcd 0000:3a:00.0: set port remote wake mask, actual port 1 status = 0xe0002a0 [ 433.422465] hub 4-0:1.0: hub_suspend [ 433.422475] usb usb4: bus auto-suspend, wakeup 1 [ 433.426161] xhci_hcd 0000:3a:00.0: xhci_hub_status_data: stopping port polling. [ 433.466209] xhci_hcd 0000:3a:00.0: port 0 polling in bus suspend, waiting [ 433.510204] xhci_hcd 0000:3a:00.0: port 0 polling in bus suspend, waiting [ 433.554051] xhci_hcd 0000:3a:00.0: port 0 polling in bus suspend, waiting [ 433.598235] xhci_hcd 0000:3a:00.0: port 0 polling in bus suspend, waiting [ 433.642154] xhci_hcd 0000:3a:00.0: port 0 polling in bus suspend, waiting [ 433.686204] xhci_hcd 0000:3a:00.0: port 0 polling in bus suspend, waiting [ 433.730205] xhci_hcd 0000:3a:00.0: port 0 polling in bus suspend, waiting [ 433.774203] xhci_hcd 0000:3a:00.0: port 0 polling in bus suspend, waiting [ 433.818207] xhci_hcd 0000:3a:00.0: port 0 polling in bus suspend, waiting [ 433.862040] xhci_hcd 0000:3a:00.0: port 0 polling in bus suspend, waiting [ 433.862053] xhci_hcd 0000:3a:00.0: xhci_hub_status_data: stopping port polling. [ 433.862077] xhci_hcd 0000:3a:00.0: xhci_suspend: stopping port polling. [ 433.862096] xhci_hcd 0000:3a:00.0: // Setting command ring address to 0x8578fc001 [ 433.862312] xhci_hcd 0000:3a:00.0: hcd_pci_runtime_suspend: 0 [ 433.862445] xhci_hcd 0000:3a:00.0: PME# enabled [ 433.902376] xhci_hcd 0000:3a:00.0: restoring config space at offset 0xc (was 0x0, writing 0x20) [ 433.902395] xhci_hcd 0000:3a:00.0: restoring config space at offset 0x4 (was 0x100000, writing 0x100403) [ 433.902490] xhci_hcd 0000:3a:00.0: PME# disabled [ 433.902504] xhci_hcd 0000:3a:00.0: enabling bus mastering [ 433.902547] xhci_hcd 0000:3a:00.0: // Setting command ring address to 0x8578fc001 [ 433.902649] pcieport 0000:00:1b.0: PME: Spurious native interrupt! [ 433.902839] xhci_hcd 0000:3a:00.0: Port change event, 4-1, id 3, portsc: 0xb0202e2 [ 433.902842] xhci_hcd 0000:3a:00.0: resume root hub [ 433.902845] xhci_hcd 0000:3a:00.0: handle_port_status: starting port polling. [ 433.902877] xhci_hcd 0000:3a:00.0: xhci_resume: starting port polling. [ 433.902889] xhci_hcd 0000:3a:00.0: xhci_hub_status_data: stopping port polling. [ 433.902891] xhci_hcd 0000:3a:00.0: hcd_pci_runtime_resume: 0 [ 433.902919] usb usb4: usb wakeup-resume [ 433.902942] usb usb4: usb auto-resume [ 433.902966] hub 4-0:1.0: hub_resume ... As Mathias pointed out, the hub enters Cold Attach Status state and requires a warm reset. However usb_reset_device() bails out early when the device is in suspended state, as its callers port_event() and hub_event() don't always resume the device. Since there's nothing wrong to reset a suspended device, allow usb_reset_device() to do so to solve the issue. Signed-off-by: Kai-Heng Feng <kai.heng.feng@canonical.com> Acked-by: Alan Stern <stern@rowland.harvard.edu> Cc: stable <stable@vger.kernel.org> Link: https://lore.kernel.org/r/20191106062710.29880-1-kai.heng.feng@canonical.com Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>		2019-12-17 20:34:31 +01:00
arch	KVM: x86: fix out-of-bounds write in KVM_GET_EMULATED_CPUID (CVE-2019-19332)	2019-12-13 08:52:58 +01:00
block	block: call rq_qos_exit() after queue is frozen	2019-12-01 09:17:06 +01:00
certs	export.h: remove VMLINUX_SYMBOL() and VMLINUX_SYMBOL_STR()	2018-08-22 23:21:44 +09:00
crypto	crypto: user - fix memory leak in crypto_report	2019-12-13 08:52:48 +01:00
Documentation	USB: documentation: flags on usb-storage versus UAS	2019-12-17 20:34:30 +01:00
drivers	usb: Allow USB device to be warm reset in suspended state	2019-12-17 20:34:31 +01:00
firmware	kbuild: remove all dummy assignments to obj-	2017-11-18 11:46:06 +09:00
fs	xfs: add missing error check in xfs_prepare_shift()	2019-12-13 08:52:57 +01:00
include	appletalk: Fix potential NULL pointer dereference in unregister_snap_client	2019-12-13 08:52:59 +01:00
init	fork: fix some -Wmissing-prototypes warnings	2019-12-05 09:21:04 +01:00
ipc	ipc/mqueue.c: only perform resource calculation if user valid	2019-08-06 19:06:52 +02:00
kernel	sched/fair: Scale bandwidth quota and period without losing quota/period ratio precision	2019-12-13 08:52:35 +01:00
lib	lib/genalloc.c: include vmalloc.h	2019-12-05 09:21:05 +01:00
LICENSES	LICENSES: Remove CC-BY-SA-4.0 license text	2018-10-18 11:28:50 +02:00
mm	mm/vmstat.c: fix NUMA statistics updates	2019-12-13 08:51:27 +01:00
net	appletalk: Set error code if register_snap_client failed	2019-12-13 08:52:59 +01:00
samples	vfio-mdev/samples: Use u8 instead of char for handle functions	2019-12-05 09:20:28 +01:00
scripts	modpost: skip ELF local symbols during section mismatch check	2019-12-13 08:52:20 +01:00
security	apparmor: delete the dentry in aafs_remove() to avoid a leak	2019-12-05 09:21:19 +01:00
sound	ASoC: rsnd: fixup MIX kctrl registration	2019-12-13 08:52:57 +01:00
tools	perf script: Fix invalid LBR/binary mismatch error	2019-12-13 08:52:55 +01:00
usr	kbuild: clean compressed initramfs image	2019-10-07 18:57:16 +02:00
virt	KVM: arm/arm64: vgic: Don't rely on the wrong pending table	2019-12-13 08:52:45 +01:00
.clang-format	clang-format: Set IndentWrappedFunctionNames false	2018-08-01 18:38:51 +02:00
.cocciconfig
.get_maintainer.ignore
.gitattributes	.gitattributes: set git diff driver for C source code files	2016-10-07 18:46:30 -07:00
.gitignore	Kbuild updates for v4.17 (2nd)	2018-04-15 17:21:30 -07:00
.mailmap	libnvdimm-for-4.19_misc	2018-08-25 18:13:10 -07:00
COPYING	COPYING: use the new text with points to the license files	2018-03-23 12:41:45 -06:00
CREDITS	9p: remove Ron Minnich from MAINTAINERS	2018-08-17 16:20:26 -07:00
Kbuild	Kbuild updates for v4.15	2017-11-17 17:45:29 -08:00
Kconfig	kconfig: move the "Executable file formats" menu to fs/Kconfig.binfmt	2018-08-02 08:06:55 +09:00
MAINTAINERS	USB: rio500: Remove Rio 500 kernel driver	2019-10-17 13:44:47 -07:00
Makefile	Linux 4.19.89	2019-12-13 08:52:59 +01:00
README	Docs: Added a pointer to the formatted docs to README	2018-03-21 09:02:53 -06:00

README

Linux kernel
============

There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.

In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``.  The formatted documentation can also be read online at:

    https://www.kernel.org/doc/html/latest/

There are various text files in the Documentation/ subdirectory,
several of them using the Restructured Text markup notation.
See Documentation/00-INDEX for a list of what is contained in each file.

Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.