This is a note to let you know that I've just added the patch titled
usb: hub: Fix error loop seen after hub communication errors
to the 4.11-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
usb-hub-fix-error-loop-seen-after-hub-communication-errors.patch
and it can be found in the queue-4.11 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 245b2eecee2aac6fdc77dcafaa73c33f9644c3c7 Mon Sep 17 00:00:00 2001
From: Guenter Roeck <linux@xxxxxxxxxxxx>
Date: Mon, 20 Mar 2017 11:16:11 -0700
Subject: usb: hub: Fix error loop seen after hub communication errors
From: Guenter Roeck <linux@xxxxxxxxxxxx>
commit 245b2eecee2aac6fdc77dcafaa73c33f9644c3c7 upstream.
While stress testing a usb controller using a bind/unbind looop, the
following error loop was observed.
usb 7-1.2: new low-speed USB device number 3 using xhci-hcd
usb 7-1.2: hub failed to enable device, error -108
usb 7-1-port2: cannot disable (err = -22)
usb 7-1-port2: couldn't allocate usb_device
usb 7-1-port2: cannot disable (err = -22)
hub 7-1:1.0: hub_ext_port_status failed (err = -22)
hub 7-1:1.0: hub_ext_port_status failed (err = -22)
hub 7-1:1.0: activate --> -22
hub 7-1:1.0: hub_ext_port_status failed (err = -22)
hub 7-1:1.0: hub_ext_port_status failed (err = -22)
hub 7-1:1.0: activate --> -22
hub 7-1:1.0: hub_ext_port_status failed (err = -22)
hub 7-1:1.0: hub_ext_port_status failed (err = -22)
hub 7-1:1.0: activate --> -22
hub 7-1:1.0: hub_ext_port_status failed (err = -22)
hub 7-1:1.0: hub_ext_port_status failed (err = -22)
hub 7-1:1.0: activate --> -22
hub 7-1:1.0: hub_ext_port_status failed (err = -22)
hub 7-1:1.0: hub_ext_port_status failed (err = -22)
hub 7-1:1.0: activate --> -22
hub 7-1:1.0: hub_ext_port_status failed (err = -22)
hub 7-1:1.0: hub_ext_port_status failed (err = -22)
hub 7-1:1.0: activate --> -22
hub 7-1:1.0: hub_ext_port_status failed (err = -22)
hub 7-1:1.0: hub_ext_port_status failed (err = -22)
hub 7-1:1.0: activate --> -22
hub 7-1:1.0: hub_ext_port_status failed (err = -22)
hub 7-1:1.0: hub_ext_port_status failed (err = -22)
hub 7-1:1.0: activate --> -22
hub 7-1:1.0: hub_ext_port_status failed (err = -22)
hub 7-1:1.0: hub_ext_port_status failed (err = -22)
** 57 printk messages dropped ** hub 7-1:1.0: activate --> -22
** 82 printk messages dropped ** hub 7-1:1.0: hub_ext_port_status failed (err = -22)
This continues forever. After adding tracebacks into the code,
the call sequence leading to this is found to be as follows.
[<ffffffc0007fc8e0>] hub_activate+0x368/0x7b8
[<ffffffc0007fceb4>] hub_resume+0x2c/0x3c
[<ffffffc00080b3b8>] usb_resume_interface.isra.6+0x128/0x158
[<ffffffc00080b5d0>] usb_suspend_both+0x1e8/0x288
[<ffffffc00080c9c4>] usb_runtime_suspend+0x3c/0x98
[<ffffffc0007820a0>] __rpm_callback+0x48/0x7c
[<ffffffc00078217c>] rpm_callback+0xa8/0xd4
[<ffffffc000786234>] rpm_suspend+0x84/0x758
[<ffffffc000786ca4>] rpm_idle+0x2c8/0x498
[<ffffffc000786ed4>] __pm_runtime_idle+0x60/0xac
[<ffffffc00080eba8>] usb_autopm_put_interface+0x6c/0x7c
[<ffffffc000803798>] hub_event+0x10ac/0x12ac
[<ffffffc000249bb8>] process_one_work+0x390/0x6b8
[<ffffffc00024abcc>] worker_thread+0x480/0x610
[<ffffffc000251a80>] kthread+0x164/0x178
[<ffffffc0002045d0>] ret_from_fork+0x10/0x40
kick_hub_wq() is called from hub_activate() even after failures to
communicate with the hub. This results in an endless sequence of
hub event -> hub activate -> wq trigger -> hub event -> ...
Provide two solutions for the problem.
- Only trigger the hub event queue if communication with the hub
is successful.
- After a suspend failure, only resume already suspended interfaces
if the communication with the device is still possible.
Each of the changes fixes the observed problem. Use both to improve
robustness.
Acked-by: Alan Stern <stern@xxxxxxxxxxxxxxxxxxx>
Signed-off-by: Guenter Roeck <linux@xxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/usb/core/driver.c | 18 ++++++++++++++++++
drivers/usb/core/hub.c | 5 ++++-
2 files changed, 22 insertions(+), 1 deletion(-)
--- a/drivers/usb/core/driver.c
+++ b/drivers/usb/core/driver.c
@@ -1331,6 +1331,24 @@ static int usb_suspend_both(struct usb_d
*/
if (udev->parent && !PMSG_IS_AUTO(msg))
status = 0;
+
+ /*
+ * If the device is inaccessible, don't try to resume
+ * suspended interfaces and just return the error.
+ */
+ if (status && status != -EBUSY) {
+ int err;
+ u16 devstat;
+
+ err = usb_get_status(udev, USB_RECIP_DEVICE, 0,
+ &devstat);
+ if (err) {
+ dev_err(&udev->dev,
+ "Failed to suspend device, error %d\n",
+ status);
+ goto done;
+ }
+ }
}
/* If the suspend failed, resume interfaces that did get suspended */
--- a/drivers/usb/core/hub.c
+++ b/drivers/usb/core/hub.c
@@ -1066,6 +1066,9 @@ static void hub_activate(struct usb_hub
portstatus = portchange = 0;
status = hub_port_status(hub, port1, &portstatus, &portchange);
+ if (status)
+ goto abort;
+
if (udev || (portstatus & USB_PORT_STAT_CONNECTION))
dev_dbg(&port_dev->dev, "status %04x change %04x\n",
portstatus, portchange);
@@ -1198,7 +1201,7 @@ static void hub_activate(struct usb_hub
/* Scan all ports that need attention */
kick_hub_wq(hub);
-
+ abort:
if (type == HUB_INIT2 || type == HUB_INIT3) {
/* Allow autosuspend if it was suppressed */
disconnected:
Patches currently in stable-queue which might be from linux@xxxxxxxxxxxx are
queue-4.11/usb-hub-do-not-attempt-to-autosuspend-disconnected-devices.patch
queue-4.11/usb-hub-fix-error-loop-seen-after-hub-communication-errors.patch