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da08d8cb8c
linux/drivers/of
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Guenter Roeck da08d8cb8c of: unittest: Disable interrupt node tests for old world MAC systems 
On systems with OF_IMAP_OLDWORLD_MAC set in of_irq_workarounds, the
devicetree interrupt parsing code is different, causing unit tests of
devicetree interrupt nodes to fail. Due to a bug in unittest code, which
tries to dereference an uninitialized pointer, this results in a crash.

OF: /testcase-data/phandle-tests/consumer-a: arguments longer than property
Unable to handle kernel paging request for data at address 0x00bc616e
Faulting instruction address: 0xc08e9468
Oops: Kernel access of bad area, sig: 11 [#1]
BE PREEMPT PowerMac
Modules linked in:
CPU: 0 PID: 1 Comm: swapper Not tainted 4.14.72-rc1-yocto-standard+ #1
task: cf8e0000 task.stack: cf8da000
NIP:  c08e9468 LR: c08ea5bc CTR: c08ea5ac
REGS: cf8dbb50 TRAP: 0300   Not tainted  (4.14.72-rc1-yocto-standard+)
MSR:  00001032 <ME,IR,DR,RI>  CR: 82004044  XER: 00000000
DAR: 00bc616e DSISR: 40000000
GPR00: c08ea5bc cf8dbc00 cf8e0000 c13ca517 c13ca517 c13ca8a0 00000066 00000002
GPR08: 00000063 00bc614e c0b05865 000affff 82004048 00000000 c00047f0 00000000
GPR16: c0a80000 c0a9cc34 c13ca517 c0ad1134 05ffffff 000affff c0b05860 c0abeef8
GPR24: cecec278 cecec278 c0a8c4d0 c0a885e0 c13ca8a0 05ffffff c13ca8a0 c13ca517

NIP [c08e9468] device_node_gen_full_name+0x30/0x15c
LR [c08ea5bc] device_node_string+0x190/0x3c8
Call Trace:
[cf8dbc00] [c007f670] trace_hardirqs_on_caller+0x118/0x1fc (unreliable)
[cf8dbc40] [c08ea5bc] device_node_string+0x190/0x3c8
[cf8dbcb0] [c08eb794] pointer+0x25c/0x4d0
[cf8dbd00] [c08ebcbc] vsnprintf+0x2b4/0x5ec
[cf8dbd60] [c08ec00c] vscnprintf+0x18/0x48
[cf8dbd70] [c008e268] vprintk_store+0x4c/0x22c
[cf8dbda0] [c008ecac] vprintk_emit+0x94/0x130
[cf8dbdd0] [c008ff54] printk+0x5c/0x6c
[cf8dbe10] [c0b8ddd4] of_unittest+0x2220/0x26f8
[cf8dbea0] [c0004434] do_one_initcall+0x4c/0x184
[cf8dbf00] [c0b4534c] kernel_init_freeable+0x13c/0x1d8
[cf8dbf30] [c0004814] kernel_init+0x24/0x118
[cf8dbf40] [c0013398] ret_from_kernel_thread+0x5c/0x64

The problem was observed when running a qemu test for the g3beige machine
with devicetree unittests enabled.

Disable interrupt node tests on affected systems to avoid both false
unittest failures and the crash.

With this patch in place, unittest on the affected system passes with
the following message.

	dt-test ### end of unittest - 144 passed, 0 failed

Fixes: 53a42093d9 ("of: Add device tree selftests")
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
Reviewed-by: Frank Rowand <frank.rowand@sony.com>
Signed-off-by: Rob Herring <robh@kernel.org>
2018-09-27 16:11:41 -05:00
..
unittest-data of/unittest: Fix I2C bus unit-address error 2018-09-19 15:10:06 -07:00
address.c drivers/of: Make of_io_request_and_map() "name" argument optional 2018-07-10 08:08:57 -06:00
base.c Merge branch 'dt/linus' into HEAD 2018-09-19 15:10:03 -07:00
device.c of: Convert to using %pOFn instead of device_node.name 2018-09-07 11:04:41 -05:00
dynamic.c of: overlay: do not include path in full_name of added nodes 2018-03-05 15:38:34 -06:00
fdt_address.c of: Use SPDX license tag for DT files 2018-01-08 08:22:45 -06:00
fdt.c of/fdt: Remove PPC32 longtrail hack in memory scan 2018-08-07 12:05:54 -06:00
irq.c of: Use SPDX license tag for DT files 2018-01-08 08:22:45 -06:00
Kconfig of: change overlay apply input data from unflattened to FDT 2018-03-04 00:29:24 -08:00
kobj.c of: Use SPDX license tag for DT files 2018-01-08 08:22:45 -06:00
Makefile PCI: Move OF-related PCI functions into PCI core 2018-01-17 17:36:39 -06:00
of_mdio.c of: Convert to using %pOFn instead of device_node.name 2018-09-07 11:04:41 -05:00
of_net.c of_net: Implement of_get_nvmem_mac_address helper 2018-03-30 10:40:18 -04:00
of_numa.c of: Convert to using %pOFn instead of device_node.name 2018-09-07 11:04:41 -05:00
of_private.h of: make default address and size cells sizes private 2018-09-07 11:04:41 -05:00
of_reserved_mem.c drivers: remove force dma flag from buses 2018-05-03 16:25:08 +02:00
overlay.c of: Convert to using %pOFn instead of device_node.name 2018-09-07 11:04:41 -05:00
pdt.c of: Use SPDX license tag for DT files 2018-01-08 08:22:45 -06:00
platform.c of: Convert to using %pOFn instead of device_node.name 2018-09-07 11:04:41 -05:00
property.c device property: Constify device_get_match_data() 2018-02-12 10:41:11 +01:00
resolver.c of: overlay: validate offset from property fixups 2018-05-23 15:07:43 -05:00
unittest.c of: unittest: Disable interrupt node tests for old world MAC systems 2018-09-27 16:11:41 -05:00