usb/chipidea: fix oops on memory allocation failure
When CMA fails to initialize in v3.12-rc4, the chipidea driver oopses
the kernel while trying to remove and put the HCD which doesn't exist:
WARNING: CPU: 0 PID: 6 at /home/rmk/git/linux-rmk/arch/arm/mm/dma-mapping.c:511
__dma_alloc+0x200/0x240()
coherent pool not initialised!
Modules linked in:
CPU: 0 PID: 6 Comm: kworker/u2:0 Tainted: G W 3.12.0-rc4+ #56
Workqueue: deferwq deferred_probe_work_func
Backtrace:
[<
c001218c>] (dump_backtrace+0x0/0x10c) from [<
c0012328>] (show_stack+0x18/0x1c)
r6:
c05fd9cc r5:
000001ff r4:
00000000 r3:
df86ad00
[<
c0012310>] (show_stack+0x0/0x1c) from [<
c05f3a4c>] (dump_stack+0x70/0x8c)
[<
c05f39dc>] (dump_stack+0x0/0x8c) from [<
c00230a8>] (warn_slowpath_common+0x6c/0x8c)
r4:
df883a60 r3:
df86ad00
[<
c002303c>] (warn_slowpath_common+0x0/0x8c) from [<
c002316c>] (warn_slowpath_fmt+0x38/0x40)
r8:
ffffffff r7:
00001000 r6:
c083b808 r5:
00000000 r4:
df2efe80
[<
c0023134>] (warn_slowpath_fmt+0x0/0x40) from [<
c00196bc>] (__dma_alloc+0x200/0x240)
r3:
00000000 r2:
c05fda00
[<
c00194bc>] (__dma_alloc+0x0/0x240) from [<
c001982c>] (arm_dma_alloc+0x88/0xa0)
[<
c00197a4>] (arm_dma_alloc+0x0/0xa0) from [<
c03e2904>] (ehci_setup+0x1f4/0x438)
[<
c03e2710>] (ehci_setup+0x0/0x438) from [<
c03cbd60>] (usb_add_hcd+0x18c/0x664)
[<
c03cbbd4>] (usb_add_hcd+0x0/0x664) from [<
c03e89f4>] (host_start+0xf0/0x180)
[<
c03e8904>] (host_start+0x0/0x180) from [<
c03e7c34>] (ci_hdrc_probe+0x360/0x670
)
r6:
df2ef410 r5:
00000000 r4:
df2c3010 r3:
c03e8904
[<
c03e78d4>] (ci_hdrc_probe+0x0/0x670) from [<
c0311044>] (platform_drv_probe+0x20/0x24)
[<
c0311024>] (platform_drv_probe+0x0/0x24) from [<
c030fcac>] (driver_probe_device+0x9c/0x234)
...
---[ end trace
c88ccaf3969e8422 ]---
Unable to handle kernel NULL pointer dereference at virtual address
00000028
pgd =
c0004000
[
00000028] *pgd=
00000000
Internal error: Oops: 17 [#1] SMP ARM
Modules linked in:
CPU: 0 PID: 6 Comm: kworker/u2:0 Tainted: G W 3.12.0-rc4+ #56
Workqueue: deferwq deferred_probe_work_func
task:
df86ad00 ti:
df882000 task.ti:
df882000
PC is at usb_remove_hcd+0x10/0x150
LR is at host_stop+0x1c/0x3c
pc : [<
c03cacec>] lr : [<
c03e88e4>] psr:
60000013
sp :
df883b50 ip :
df883b78 fp :
df883b74
r10:
c11f4c54 r9 :
c0836450 r8 :
df30c400
r7 :
fffffff4 r6 :
df2ef410 r5 :
00000000 r4 :
df2c3010
r3 :
00000000 r2 :
00000000 r1 :
df86b0a0 r0 :
00000000
Flags: nZCv IRQs on FIQs on Mode SVC_32 ISA ARM Segment kernel
Control:
10c53c7d Table:
2f29404a DAC:
00000015
Process kworker/u2:0 (pid: 6, stack limit = 0xdf882240)
Stack: (0xdf883b50 to 0xdf884000)
...
Backtrace:
[<
c03cacdc>] (usb_remove_hcd+0x0/0x150) from [<
c03e88e4>] (host_stop+0x1c/0x3c)
r6:
df2ef410 r5:
00000000 r4:
df2c3010
[<
c03e88c8>] (host_stop+0x0/0x3c) from [<
c03e8aa0>] (ci_hdrc_host_destroy+0x1c/0x20)
r5:
00000000 r4:
df2c3010
[<
c03e8a84>] (ci_hdrc_host_destroy+0x0/0x20) from [<
c03e7c80>] (ci_hdrc_probe+0x3ac/0x670)
[<
c03e78d4>] (ci_hdrc_probe+0x0/0x670) from [<
c0311044>] (platform_drv_probe+0x20/0x24)
[<
c0311024>] (platform_drv_probe+0x0/0x24) from [<
c030fcac>] (driver_probe_device+0x9c/0x234)
[<
c030fc10>] (driver_probe_device+0x0/0x234) from [<
c030ff28>] (__device_attach+0x44/0x48)
...
---[ end trace
c88ccaf3969e8423 ]---
Fix this so at least we can continue booting and get to a shell prompt.
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
Tested-by: Russell King <rmk+kernel@arm.linux.org.uk>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>