When we rmmod gadget, the ci->driver needs to be cleared.
Otherwise, we plug in usb cable again, the driver will
consider gadget is there, in fact, it is removed.
Below is the oops this patch fixes.
root@freescale ~$ ci_hdrc ci_hdrc.0: Connected to host
Unable to handle kernel paging request at virtual address 7f01171c
pgd = 80004000
[7f01171c] *pgd=4fa1e811, *pte=00000000, *ppte=00000000
Internal error: Oops: 7 [#1] SMP ARM
Modules linked in: f_acm libcomposite u_serial [last unloaded: g_serial]
CPU: 0 Not tainted (3.8.0-rc5+ #221)
PC is at _gadget_stop_activity+0xbc/0x128
LR is at ep_fifo_flush+0x68/0xa0
pc : [<803634cc>] lr : [<80363938>] psr: 20000193
sp : 806c7dc8 ip : 00000000 fp : 806c7de4
r10: 00000000 r9 : 80710ea4 r8 : 00000000
r7 : bf834094 r6 : bf834098 r5 : bf834010 r4 : bf8340a0
r3 : 7f011708 r2 : 01940194 r1 : a0000193 r0 : bf834014
Flags: nzCv IRQs off FIQs on Mode SVC_32 ISA ARM Segment kernel
Control: 10c53c7d Table: 4f06404a DAC: 00000017
Process swapper/0 (pid: 0, stack limit = 0x806c6238)
Stack: (0x806c7dc8 to 0x806c8000)
7dc0: bf834010 bf809950 bf834010 0000004b 806c7e44
806c7de8
7de0: 80365400 8036341c 0000ec1c 00000000 0000ec1c 00000040 fff5ede0
bf834014
7e00: 000a1220 00000000 0000002e ffffd958 806c7e3c 806c7e20 8004e870
bf834010
7e20: bf809950 0000004b 0000004b 00000000 80710ea4 00000000 806c7e5c
806c7e48
7e40: 80362888 80365154 bfb35180 bf809950 806c7e9c 806c7e60 8008111c
803627f4
7e60: 00989680 00000000 bf809900 bf809964 812df8c0 bf809900 bf809950
806c3f2c
7e80: 0000004b 00000000 412fc09a 00000000 806c7eb4 806c7ea0 80081368
800810b8
7ea0: bf809900 bf809950 806c7ecc 806c7eb8 800843c8 8008130c 0000004b
806cf748
7ec0: 806c7ee4 806c7ed0 80081088 8008432c 806c6000 806cf748 806c7f0c
806c7ee8
7ee0: 8000fa44 8008105c f400010c 806ce974 806c7f30 f4000110 806d29e8
412fc09a
7f00: 806c7f2c 806c7f10 80008584 8000f9f4 8000fbd0 60000013 ffffffff
806c7f64
7f20: 806c7f84 806c7f30 8000eac0 80008554 00000000 00000000 0000000f
8001aea0
7f40: 806c6000 80712a48 804f0040 00000000 806d29e8 412fc09a 00000000
806c7f84
7f60: 806c7f88 806c7f78 8000fbcc 8000fbd0 60000013 ffffffff 806c7fac
806c7f88
7f80: 8001015c 8000fb9c 806cf5b0 80712980 806a4528 8fffffff 1000406a
412fc09a
7fa0: 806c7fbc 806c7fb0 804e5334 800100ac 806c7ff4 806c7fc0 80668940
804e52d4
7fc0: ffffffff ffffffff 806684bc 00000000 00000000 806a4528 10c53c7d
806ce94c
7fe0: 806a4524 806d29dc 00000000 806c7ff8 10008078 806686b0 00000000
00000000
Backtrace:
[<80363410>] (_gadget_stop_activity+0x0/0x128) from [<80365400>]
(udc_irq+0x2b8/0xf38)
r7:0000004b r6:bf834010 r5:bf809950 r4:bf834010
[<80365148>] (udc_irq+0x0/0xf38) from [<80362888>] (ci_irq+0xa0/0xf4)
[<803627e8>] (ci_irq+0x0/0xf4) from [<8008111c>]
(handle_irq_event_percpu+0x70/0x254)
r5:bf809950 r4:bfb35180
[<800810ac>] (handle_irq_event_percpu+0x0/0x254) from [<80081368>]
(handle_irq_event+0x68/0x88)
[<80081300>] (handle_irq_event+0x0/0x88) from [<800843c8>]
(handle_fasteoi_irq+0xa8/0x178)
r5:bf809950 r4:bf809900
[<80084320>] (handle_fasteoi_irq+0x0/0x178) from [<80081088>]
(generic_handle_irq+0x38/0x40)
r5:806cf748 r4:0000004b
[<80081050>] (generic_handle_irq+0x0/0x40) from [<8000fa44>]
(handle_IRQ+0x5c/0xbc)
r5:806cf748 r4:806c6000
[<8000f9e8>] (handle_IRQ+0x0/0xbc) from [<80008584>]
(gic_handle_irq+0x3c/0x70)
r9:412fc09a r8:806d29e8 r7:f4000110 r6:806c7f30 r5:806ce974
r4:f400010c
[<80008548>] (gic_handle_irq+0x0/0x70) from [<8000eac0>]
(__irq_svc+0x40/0x54)
Exception stack(0x806c7f30 to 0x806c7f78)
7f20: 00000000 00000000 0000000f
8001aea0
7f40: 806c6000 80712a48 804f0040 00000000 806d29e8 412fc09a 00000000
806c7f84
7f60: 806c7f88 806c7f78 8000fbcc 8000fbd0 60000013 ffffffff
r7:806c7f64 r6:ffffffff r5:60000013 r4:8000fbd0
[<8000fb90>] (default_idle+0x0/0x4c) from [<8001015c>]
(cpu_idle+0xbc/0xf8)
[<800100a0>] (cpu_idle+0x0/0xf8) from [<804e5334>] (rest_init+0x6c/0x84)
r9:412fc09a r8:1000406a r7:8fffffff r6:806a4528 r5:80712980
r4:806cf5b0
[<804e52c8>] (rest_init+0x0/0x84) from [<80668940>]
(start_kernel+0x29c/0x2ec)
[<806686a4>] (start_kernel+0x0/0x2ec) from [<10008078>] (0x10008078)
Code: e12fff33 e5953200 e3530000 0a000002 (e5933014)
---[ end trace aade28ad434062bd ]---
Kernel panic - not syncing: 0xbf8bdfa8)
df60: 00000000 00000000 0000000f 8001aea0 bf8bc000 80712a48 804f0040
00000000
df80: 806d29e8 412fc09a 00000000 bf8bdfb4 bf8bdfb8 bf8bdfa8 8000fbcc
8000fbd0
dfa0: 60000013 ffffffff
r7:bf8bdf94 r6:ffffffff r5:60000013 r4:8000fbd0
[<8000fb90>] (default_idle+0x0/0x4c) from [<8001015c>]
(cpu_idle+0xbc/0xf8)
[<800100a0>] (cpu_idle+0x0/0xf8) from [<804e7930>]
(secondary_start_kernel+0x120/0x148)
r9:412fc09a r8:1000406a r7:80712d20 r6:10c03c7d r5:00000002
r4:806e2008
[<804e7810>] (secondary_start_kernel+0x0/0x148) from [<104e7148>]
(0x104e7148)
r5:0000001f r4:4f8a806a
CPU3: stopping
Backtrace:
[<800132e8>] (dump_backtrace+0x0/0x114) from [<804ea684>]
(dump_stack+0x20/0x24)
r7:00000000 r6:806c3f2c r5:806cf748 r4:80712d18
[<804ea664>] (dump_stack+0x0/0x24) from [<80014adc>]
(handle_IPI+0x140/0x18c)
[<8001499c>] (handle_IPI+0x0/0x18c) from [<800085b0>]
(gic_handle_irq+0x68/0x70)
r9:412fc09a r8:806d29e8 r7:f4000110 r6:bf8bff60 r5:806ce974
r4:f400010c
[<80008548>] (gic_handle_irq+0x0/0x70) from [<8000eac0>]
(__irq_svc+0x40/0x54)
Exception stack(0xbf8bff60 to 0xbf8bffa8)
ff60: 00000000 00000000 0000000f 8001aea0 bf8be000 80712a48 804f0040
00000000
ff80: 806d29e8 412fc09a 00000000 bf8bffb4 bf8bffb8 bf8bffa8 8000fbcc
8000fbd0
ffa0: 60000013 ffffffff
r7:bf8bff94 r6:ffffffff r5:60000013 r4:8000fbd0
[<8000fb90>] (default_idle+0x0/0x4c) from [<8001015c>]
(cpu_idle+0xbc/0xf8)
[<800100a0>] (cpu_idle+0x0/0xf8) from [<804e7930>]
(secondary_start_kernel+0x120/0x148)
r9:412fc09a r8:1000406a r7:80712d20 r6:10c03c7d r5:00000003
r4:806e2008
[<804e7810>] (secondary_start_kernel+0x0/0x148) from [<104e7148>]
(0x104e7148)
r5:0000001f r4:4f8a806a
CPU1: stopping
Backtrace:
[<800132e8>] (dump_backtrace+0x0/0x114) from [<804ea684>]
(dump_stack+0x20/0x24)
r7:00000000 r6:806c3f2c r5:806cf748 r4:80712d18
[<804ea664>] (dump_stack+0x0/0x24) from [<80014adc>]
(handle_IPI+0x140/0x18c)
[<8001499c>] (handle_IPI+0x0/0x18c) from [<800085b0>]
(gic_handle_irq+0x68/0x70)
r9:412fc09a r8:806d29e8 r7:f4000110 r6:bf8bbf60 r5:806ce974
r4:f400010c
[<80008548>] (gic_handle_irq+0x0/0x70) from [<8000eac0>]
(__irq_svc+0x40/0x54)
Exception stack(0xbf8bbf60 to 0xbf8bbfa8)
bf60: 00000000 00000000 0000000f 8001aea0 bf8ba000 80712a48 804f0040
00000000
bf80: 806d29e8 412fc09a 00000000 bf8bbfb4 bf8bbfb8 bf8bbfa8 8000fbcc
8000fbd0
bfa0: 60000013 ffffffff
r7:bf8bbf94 r6:ffffffff r5:60000013 r4:8000fbd0
[<8000fb90>] (default_idle+0x0/0x4c) from [<8001015c>]
(cpu_idle+0xbc/0xf8)
[<800100a0>] (cpu_idle+0x0/0xf8) from [<804e7930>]
(secondary_start_kernel+0x120/0x148)
r9:412fc09a r8:1000406a r7:80712d20 r6:10c03c7d r5:00000001
r4:806e2008
Signed-off-by: Peter Chen <peter.c...@freescale.com>
---
drivers/usb/chipidea/udc.c | 2 ++
1 files changed, 2 insertions(+), 0 deletions(-)
diff --git a/drivers/usb/chipidea/udc.c b/drivers/usb/chipidea/udc.c
index b57b735..40820aa 100644
--- a/drivers/usb/chipidea/udc.c
+++ b/drivers/usb/chipidea/udc.c
@@ -1585,6 +1585,8 @@ static int ci13xxx_stop(struct usb_gadget *gadget,
_gadget_stop_activity(&ci->gadget);
spin_lock_irqsave(&ci->lock, flags);
pm_runtime_put(&ci->gadget.dev);
+ } else {
+ ci->driver = NULL;
}
spin_unlock_irqrestore(&ci->lock, flags);
--
1.7.0.4
--
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