System panic at xhci_hub_check_speed+0x44/0x74
After disconnect the otg device from host
Add the null pointer check to fix the problem
panic trace:
[ 394.979815,2] xhci-hcd xhci-hcd.2.auto: USB bus 2 deregistered
[ 394.980005,2] xhci-hcd xhci-hcd.2.auto: remove, state 4
[ 394.980100,2] usb usb1: USB disconnect, device number 1
[ 394.954183,0] Unable to handle kernel read from unreadable memory
at virtual address
0000001c
[ 395.067339,0] task:
ffffffc876ef4400 task.stack:
ffffff800b328000
[ 395.073424,0] PC is at xhci_hub_check_speed+0x44/0x74
[ 395.078455,0] LR is at xhci_hub_check_speed+0x14/0x74
[ 395.094516,0] x29:
ffffff800b32ba70 x28:
0000000000000000
[ 395.099986,0] x27:
ffffff800b32bc08 x26:
00000000ffffffff
[ 395.105453,0] x25:
0000000000000001 x24:
0000000000000001
[ 395.110924,0] x23:
ffffffc84a14a140 x22:
ffffffc835343800
[ 395.116393,0] x21:
0000000000000000 x20:
ffffffc84a14a000
[ 395.121866,0] x19:
ffffffc053b5c000 x18:
0000000000000001
[ 395.127336,0] x17:
0000000000000000 x16:
0000000000000000
[ 395.132844,0] x15:
ffffff8009567000 x14:
0000000000000001
[ 395.138275,0] x13:
0000000000258024 x12:
000000000000cf90
[ 395.143745,0] x11:
f6e18e3f25207900 x10:
0000000000000000
[ 395.149216,0] x9 :
ffffffc84a14a458 x8 :
0000000000000001
[ 395.154688,0] x7 :
0000000000000000 x6 :
ffffff80099394e6
[ 395.160160,0] x5 :
0000000000000033 x4 :
0000000000000000
[ 395.165627,0] x3 :
ffffff800b32b968 x2 :
ffffff8008090470
[ 395.171097,0] x1 :
ffffff800b32b968 x0 :
0000000000000000
[ 396.318730,0] [<
ffffff8008664eec>] xhci_hub_check_speed+0x44/0x74
[ 396.324803,0] [<
ffffff800862a20c>] hcd_bus_suspend+0x144/0x24c
[ 396.330617,0] [<
ffffff800863b768>] generic_suspend+0x44/0x4c
[ 396.336262,0] [<
ffffff800863001c>] usb_suspend_both+0x164/0x234
[ 396.342165,0] [<
ffffff800863058c>] usb_runtime_suspend+0x30/0x68
[ 396.348159,0] [<
ffffff80084ff07c>] __rpm_callback+0xc4/0x1cc
[ 396.353800,0] [<
ffffff80084fef34>] rpm_callback+0x28/0x7c
[ 396.359181,0] [<
ffffff80084fd268>] rpm_suspend+0x210/0x4dc
[ 396.364652,0] [<
ffffff80084fda74>] __pm_runtime_suspend+0x80/0xa4
[ 396.370731,0] [<
ffffff8008630730>] usb_runtime_idle+0x28/0x38
[ 396.376461,0] [<
ffffff80084ff07c>] __rpm_callback+0xc4/0x1cc
[ 396.382105,0] [<
ffffff80084fd8a4>] rpm_idle+0x200/0x350
[ 396.387314,0] [<
ffffff80084fe9f0>] pm_runtime_work+0x5c/0x90
[ 396.392961,0] [<
ffffff80080c8d28>] process_one_work+0x1dc/0x408
[ 396.398863,0] [<
ffffff80080c91d8>] worker_thread+0x220/0x340
[ 396.404510,0] [<
ffffff80080cd864>] kthread+0x11c/0x12c
[ 396.409632,0] [<
ffffff8008084934>] ret_from_fork+0x10/0x18
Change-Id: I4bf5584143b8434ff5a99c7c9855bf74616da39f
Signed-off-by: a17671 <a17671@motorola.com>
Reviewed-on: https://gerrit.mot.com/
1279212
SLTApproved: Slta Waiver
SME-Granted: SME Approvals Granted
Tested-by: Jira Key
Reviewed-by: Xiangpo Zhao <zhaoxp3@motorola.com>
Submit-Approved: Jira Key