MA-13475 usb: cdns3: gadget: fix NULL pointer issue when switch functions

MA-13475 usb: cdns3: gadget: fix NULL pointer issue when switch functions

Below oops is reproduced when switch between mtp and ptp function
at Android, the interrupt occurs when the usb_ss->gadget_driver
is already NULL. In this commit, we add NULL pointer check for
it as well as protecting for clear usb_ss->gadget_driver.

init: Sending signal 9 to service 'adbd' (pid 4644) process group...
Mem abort info:
  Exception class = DABT (current EL), IL = 32 bits
  SET = 0, FnV = 0
  EA = 0, S1PTW = 0
Data abort info:
  ISV = 0, ISS = 0x00000004
  CM = 0, WnR = 0
user pgtable: 4k pages, 48-bit VAs, pgd = ffff800830e49000
[0000000000000020] *pgd=0000000000000000
Internal error: Oops: 96000004 [#1] PREEMPT SMP
Modules linked in: wlan
CPU: 0 PID: 3226 Comm: surfaceflinger Not tainted 4.14.98 #1
init: Successfully killed process cgroup uid 0 pid 4644 in 11ms
Hardware name: Freescale i.MX8QXP MEK (DT)
task: ffff80083bf55400 task.stack: ffff00000ffe8000
PC is at cdns_get_setup_ret+0x38/0x64
LR is at cdns_get_setup_ret+0x24/0x64
pc : [<ffff0000089b0e88>] lr : [<ffff0000089b0e74>] pstate: 000001c5
sp : ffff000008003d10
x29: ffff000008003d10 x28: ffff80083bf55400
x27: ffff000009873018 x26: ffff000008004000
x25: ffff000009873018 x24: ffff000009c6a288
x23: ffff000008003f24 x22: ffff00000a85e000
x21: 0000000000000001 x20: ffff8008361c97b8
x19: ffff8008361c9000 x18: 0000000000000001
x17: 0000fe6e544aee34 x16: ffff0000082b54f0
x15: 0000ffffccae15f0 x14: 0000000000000000
x13: 0000000000000000 x12: 0000000000010000
x11: 0000000000000040 x10: 0000000000000040
x9 : ffff8008380ae238 x8 : ffff800838000248
x7 : 0000000000000000 x6 : ffff800838000248
init: Service 'adbd' (pid 4644) killed by signal 9
x5 : ffff80083ae40600 x4 : 0000000000000000
x3 : 00000000000001c0 x2 : 0000000000000000
x1 : ffff00000a85e000 x0 : ffff8008361c9300

X0: 0xffff8008361c9280:
9280  00000000 00000000 00000000 00000000 000f000f
init: processing action (init.svc.adbd=stopped) from (/init.usb.configfs.rc:15)
 00000000 3bf6ce00 ffff8008
92a0  3acd9a00 ffff8008 00000000 00000000 00000000 00000000 00000000 00000000
92c0  00000000 00000000 00000000 00000000 00000000 00000000 089b0e3c ffff0000
92e0  00000000
init: processing action (sys.usb.config=mtp,adb && sys.usb.configfs=1) from (/init.usb.configfs.rc:33)
 00000000 00000000 00000000
read descriptors
read strings
init: starting service 'adbd'...
 00000000
init: property_set("ro.boottime.adbd", "97804848500") failed: property already set
init: Created socket '/dev/socket/adbd', mode 660, user 1000, group 1000
 00000000 0e0f0000 ffff0000
9300  3ff21105 ffff8008 3ff1d120 ffff8008 2e15d4e0 ffff8008 089f9558 ffff0000
9320  3618ac00 ffff8008 091b7860 ffff0000 3bf6ce18 ffff8008 3bf6cd30
read descriptors
read strings
 ffff8008
9340  3acd9a30 ffff8008 00000000 00000005 00000000 00000000 095c4e58 ffff0000
9360  361c9000 ffff8008 3acd9700 ffff8008 095be4c8 ffff0000 3618ac28 ffff8008

X5: 0xffff80083ae40580:
0580  00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
05a0  00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
05c0  00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
05e0  00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
0600  03440204 ffffffff 00000000 00000000 00000000 00000000 0000000f 00000000
0620  00000001 00000000 00000000 00000030 0000010f 00000000 3ae40600 ffff8008
0640  09d7aae0 ffff0000 3a088000 ffff8008 3aa22c80 ffff8008 00000000 00000000
0660  09886e24 ffff0000 081496ec ffff0000 3b444080 ffff8008 00000000 00000000

X6: 0xffff8008380001c8:
01c8  00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
01e8  00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
0208  00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
0228  fffffc00 ffffffff 00000000 00000000 00000000 00000000 38000248 ffff8008
0248  003f0000 00000000 380af6c0 ffff8008 09c937f0 ffff0000 38000260 ffff8008
0268  38000260 ffff8008 00000000 00000000 3a007400 ffff8008 3a007600 ffff8008
0288  3a007800 ffff8008 3a007a00 ffff8008 3a007c00 ffff8008 3a6be600 ffff8008
02a8  3ab1da00 ffff8008 3ab1dc00 ffff8008 3ab1de00 ffff8008 3ac52000 ffff8008

X8: 0xffff8008380001c8:
01c8  00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
01e8  00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
0208  00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
0228  fffffc00 ffffffff 00000000 00000000 00000000 00000000 38000248 ffff8008
0248  003f0000 00000000 380af6c0 ffff8008 09c937f0 ffff0000 38000260 ffff8008
0268  38000260 ffff8008 00000000 00000000 3a007400 ffff8008 3a007600 ffff8008
0288  3a007800 ffff8008 3a007a00 ffff8008 3a007c00 ffff8008 3a6be600 ffff8008
02a8  3ab1da00 ffff8008 3ab1dc00 ffff8008 3ab1de00 ffff8008 3ac52000 ffff8008

X9: 0xffff8008380ae1b8:
e1b8  3ae1ddd0 ffff8008 3ae1de58 ffff8008 3ae1dee0 ffff8008 3ae1df68 ffff8008
e1d8  3aad9000 ffff8008 3aad9088 ffff8008 3aad9110 ffff8008 3aad9198 ffff8008
e1f8  3aad9220 ffff8008 3aad92a8 ffff8008 3aad9330 ffff8008 3aad93b8 ffff8008
e218  00000000 00000000 00000000 00000000 00000000 00000000 380ae238 ffff8008
e238  000b0400 00000000 3802c490 ffff8008 3a081060 ffff8008 380ae250 ffff8008
e258  380ae250 ffff8008 00000000 00000000 00000000 00000000 00000000 00000000
e278  00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
e298  00000000 00000000 3aea2c28 ffff8008 3aea2e28 ffff8008 00000000 00000000

X19: 0xffff8008361c8f80:
8f80  00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
8fa0  00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
8fc0  00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
8fe0  00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
9000  3ab9f410 ffff8008 3bf6b000 ffff8008 095c4e48 ffff0000 361c9378 ffff8008
9020  360ed558 ffff8008 3ab9f420 ffff8008 3a7d5800 ffff8008 09d9fa00 ffff0000
9040  361b94c8 ffff8008 00000006 00000003 00000000 00000000 00000000 00000000
9060  00000000 00000000 00000000 00000000 361c9070 ffff8008 361c9070 ffff8008

X20: 0xffff8008361c9738:
9738  00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
9758  00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
9778  00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
9798  0000000e 00000000 71a71600 ffff8000 00000000 00000000 00000000 00000000
97b8  044c044c 00000002 00000000 00000000 00000001 00000000 3ab9f410 ffff8008
97d8  00000001 00000000 3bf6cc70 ffff8008 3bf6c170 ffff8008 00000000 00000000
97f8  00000000 00000000 361c9800 ffff8008 361c9800 ffff8008 089b1dc8 ffff0000
9818  71a71600 ffff8000 00000000 00000000 00000000 00000000 00000000 00000000

X28: 0xffff80083bf55380:
5380  00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
53a0  00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
53c0  00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
53e0  00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
5400  00000022 00000000 ffffffff ffffffff 00010001 00000000 00000000 00000000
5420  0ffe8000 ffff0000 00000006 00404100 00000000 00000000 00000000 00000000
5440  00000001 00000000 000000e6 00000000 ffff3a2d 00000000 30c10000 ffff8008
5460  00000000 00000001 00000062 00000070 00000062 00000001 09023e38 ffff0000

Process surfaceflinger (pid: 3226, stack limit = 0xffff00000ffe8000)
Call trace:
Exception stack(0xffff000008003bd0 to 0xffff000008003d10)
3bc0:                                   ffff8008361c9300 ffff00000a85e000
3be0: 0000000000000000 00000000000001c0 0000000000000000 ffff80083ae40600
3c00: ffff800838000248 0000000000000000 ffff800838000248 ffff8008380ae238
3c20: 0000000000000040 0000000000000040 0000000000010000 0000000000000000
3c40: 0000000000000000 0000ffffccae15f0 ffff0000082b54f0 0000fe6e544aee34
3c60: 0000000000000001 ffff8008361c9000 ffff8008361c97b8 0000000000000001
3c80: ffff00000a85e000 ffff000008003f24 ffff000009c6a288 ffff000009873018
3ca0: ffff000008004000 ffff000009873018 ffff80083bf55400 ffff000008003d10
3cc0: ffff0000089b0e74 ffff000008003d10 ffff0000089b0e88 00000000000001c5
3ce0: 00000000000001c0 1a8824534cfb2000 0000ffffffffffff ffff0000080f87c8
3d00: ffff000008003d10 ffff0000089b0e88
[<ffff0000089b0e88>] cdns_get_setup_ret+0x38/0x64
[<ffff0000089b2a48>] cdns_check_ep0_interrupt_proceed+0xc0/0x8dc
[<ffff0000089b3508>] cdns_irq_handler_thread+0x2a4/0x4e8
[<ffff0000089afd98>] cdns3_irq+0x44/0x94
[<ffff000008145994>] __handle_irq_event_percpu+0x60/0x24c
[<ffff000008145c54>] handle_irq_event+0x58/0xc0
[<ffff000008149784>] handle_fasteoi_irq+0x98/0x180
[<ffff000008144a58>] generic_handle_irq+0x24/0x38
[<ffff0000081451b8>] __handle_domain_irq+0x60/0xac
[<ffff0000080819c4>] gic_handle_irq+0xd4/0x17c

Signed-off-by: Peter Chen <peter.chen@nxp.com>
(cherry picked from commit 6ee6e32b0c3fcbea70117eaea3c315f0e220144c)