[PATCH] drivers:usb:disable usb hub&port async suspend to avoid block system PM

[buckzhangwh@gmail.com]

From: weihui zhang <buckzhangwh@gmail.com>

many phones are crashed and unable to wake up by power key.
We analyzed more than ten kernel-dumps, 
the common was  that system were all blocked by usb.
the phone doesn't crash again,after we disable usb hub&port async suspend.

here is one kernel-dump analysis case:
task 446 & 4511 &365 state are Uninterrupt
task 446 dpm_wait_for_superior then schedule out.

PID: 446  TASK: ffffff81f3e9cb00 CPU: 4 COMMAND: "charge"

 #0 [ffffffc015a0b9a0] __switch_to at ffffffc010088b54

 #1 [ffffffc015a0b9f0] __schedule at ffffffc010f7ef2c

 #2 [ffffffc015a0ba40] schedule at ffffffc010f7f3a4

 #3 [ffffffc015a0baa0] async_synchronize_cookie_domain at 

 #4 [ffffffc015a0bb00] async_synchronize_full at ffffffc010131e0c

 #5 [ffffffc015a0bb10] dpm_resume at ffffffc0107ec408

 #6 [ffffffc015a0bb70] dpm_resume_end at ffffffc0107ed0e8

 #7 [ffffffc015a0bbb0] suspend_devices_and_enter at ffffffc0101776d8

 #8 [ffffffc015a0bbf0] enter_state at ffffffc010177e70

 #9 [ffffffc015a0bc20] pm_suspend at ffffffc010177d5c

PID: 4511 TASK: ffffff8153b0e740 CPU: 6 COMMAND: "kworker/u16:11"

 #0 [ffffffc01bc9baa0] __switch_to at ffffffc01010293c

 #1 [ffffffc01bc9bb10] __schedule at ffffffc0116b0008

 #2 [ffffffc01bc9bb70] schedule at ffffffc0116b0794

 #3 [ffffffc01bc9bbe0] schedule_timeout at ffffffc0116b6c2c

 #4 [ffffffc01bc9bc40] wait_for_common at ffffffc0116b198c

 #5 [ffffffc01bc9bca0] dpm_wait_for_superior at ffffffc010b999e8  

 #6 [ffffffc01bc9bce0] device_resume at ffffffc010b9d804 
//x0(struct device)= ffffff81f32a3808

 #7 [ffffffc01bc9bd10] async_resume at ffffffc010b9d6ec

 #8 [ffffffc01bc9bd40] async_run_entry_fn at ffffffc0101e238c

 #9 [ffffffc01bc9bdb0] process_one_work at ffffffc0101d00e0

crash_arm64> struct device ffffff81f32a3808 -x

struct device {

  kobj = {

    name = 0xffffff81f15c6d80 "usb1-port1",

    entry = {

      next = 0xffffff81f32a6018,

      prev = 0xffffff81e4103838

    },
 type = 0xffffffc0124102b8 <usb_port_device_type>,

  bus = 0x0,

  driver = 0xffffffc0124102e8 <usb_port_driver>,

    async_suspend = 0x1,
  ...........

PID: 365 TASK: ffffff81f3bf6900 CPU: 0 COMMAND: "kworker/u16:5"

 #0 [ffffffc0158dbac0] __switch_to at ffffffc010088b54

 #1 [ffffffc0158dbb10] __schedule at ffffffc010f7ef2c

 #2 [ffffffc0158dbb60] schedule at ffffffc010f7f3a4

 #3 [ffffffc0158dbbe0] schedule_timeout at ffffffc010f83fd8

 #4 [ffffffc0158dbc40] wait_for_common at ffffffc010f80600

 #5 [ffffffc0158dbc90] wait_for_completion at ffffffc010f8051c

 #6 [ffffffc0158dbcb0] dpm_wait_for_superior at ffffffc0107eee00

 #7 [ffffffc0158dbd00] device_resume at ffffffc0107ec6a8 
//x0(struct device) = 0xffffff81ee1b3030

 #8 [ffffffc0158dbd40] async_resume at ffffffc0107ec588

 #9 [ffffffc0158dbd60] async_run_entry_fn at ffffffc010131c60

 crash_arm64> struct device ffffff81ee1b3030 -x

struct device {

  kobj = {

    name = 0xffffff81f1fc1500 "1-0:1.0",

	  type = 0xffffffc011b62a38 <usb_if_device_type>,
 ............

Signed-off-by: weihui zhang <buckzhangwh@gmail.com>
---
 drivers/usb/core/hub.c     | 2 +-
 drivers/usb/core/message.c | 2 +-
 drivers/usb/core/port.c    | 2 +-
 3 files changed, 3 insertions(+), 3 deletions(-)

diff --git a/drivers/usb/core/hub.c b/drivers/usb/core/hub.c
index e38a4124f..de74f70e5 100644
--- a/drivers/usb/core/hub.c
+++ b/drivers/usb/core/hub.c
@@ -2602,7 +2602,7 @@ int usb_new_device(struct usb_device *udev)
 		add_device_randomness(udev->manufacturer,
 				      strlen(udev->manufacturer));
 
-	device_enable_async_suspend(&udev->dev);
+	device_disable_async_suspend(&udev->dev);
 
 	/* check whether the hub or firmware marks this port as non-removable */
 	set_usb_port_removable(udev);
diff --git a/drivers/usb/core/message.c b/drivers/usb/core/message.c
index 077dfe48d..944f01aa7 100644
--- a/drivers/usb/core/message.c
+++ b/drivers/usb/core/message.c
@@ -2203,7 +2203,7 @@ int usb_set_configuration(struct usb_device *dev, int configuration)
 			"adding %s (config #%d, interface %d)\n",
 			dev_name(&intf->dev), configuration,
 			intf->cur_altsetting->desc.bInterfaceNumber);
-		device_enable_async_suspend(&intf->dev);
+		device_disable_async_suspend(&intf->dev);
 		ret = device_add(&intf->dev);
 		if (ret != 0) {
 			dev_err(&dev->dev, "device_add(%s) --> %d\n",
diff --git a/drivers/usb/core/port.c b/drivers/usb/core/port.c
index c628c1abc..97696c415 100644
--- a/drivers/usb/core/port.c
+++ b/drivers/usb/core/port.c
@@ -760,7 +760,7 @@ int usb_hub_create_port_device(struct usb_hub *hub, int port1)
 	pm_runtime_set_active(&port_dev->dev);
 	pm_runtime_get_noresume(&port_dev->dev);
 	pm_runtime_enable(&port_dev->dev);
-	device_enable_async_suspend(&port_dev->dev);
+	device_disable_async_suspend(&port_dev->dev);
 
 	/*
 	 * Keep hidden the ability to enable port-poweroff if the hub
-- 
2.17.1