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linux-next/include/trace/events
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Philipp Zabel c6b570d97c regmap: introduce regmap_name to fix syscon regmap trace events 
This patch fixes a NULL pointer dereference when enabling regmap event
tracing in the presence of a syscon regmap, introduced by commit bdb0066df9
("mfd: syscon: Decouple syscon interface from platform devices").
That patch introduced syscon regmaps that have their dev field set to NULL.
The regmap trace events expect it to point to a valid struct device and feed
it to dev_name():

  $ echo 1 > /sys/kernel/debug/tracing/events/regmap/enable

  Unable to handle kernel NULL pointer dereference at virtual address 0000002c
  pgd = 80004000
  [0000002c] *pgd=00000000
  Internal error: Oops: 17 [#1] SMP ARM
  Modules linked in: coda videobuf2_vmalloc
  CPU: 0 PID: 304 Comm: kworker/0:2 Not tainted 4.0.0-rc2+ #9197
  Hardware name: Freescale i.MX6 Quad/DualLite (Device Tree)
  Workqueue: events_freezable thermal_zone_device_check
  task: 9f25a200 ti: 9f1ee000 task.ti: 9f1ee000
  PC is at ftrace_raw_event_regmap_block+0x3c/0xe4
  LR is at _regmap_raw_read+0x1bc/0x1cc
  pc : [<803636e8>]    lr : [<80365f2c>]    psr: 600f0093
  sp : 9f1efd78  ip : 9f1efdb8  fp : 9f1efdb4
  r10: 00000004  r9 : 00000001  r8 : 00000001
  r7 : 00000180  r6 : 00000000  r5 : 9f00e3c0  r4 : 00000003
  r3 : 00000001  r2 : 00000180  r1 : 00000000  r0 : 9f00e3c0
  Flags: nZCv  IRQs off  FIQs on  Mode SVC_32  ISA ARM  Segment kernel
  Control: 10c5387d  Table: 2d91004a  DAC: 00000015
  Process kworker/0:2 (pid: 304, stack limit = 0x9f1ee210)
  Stack: (0x9f1efd78 to 0x9f1f0000)
  fd60:                                                       9f1efda4 9f1efd88
  fd80: 800708c0 805f9510 80927140 800f0013 9f1fc800 9eb2f490 00000000 00000180
  fda0: 808e3840 00000001 9f1efdfc 9f1efdb8 80365f2c 803636b8 805f8958 800708e0
  fdc0: a00f0013 803636ac 9f16de00 00000180 80927140 9f1fc800 9f1fc800 9f1efe6c
  fde0: 9f1efe6c 9f732400 00000000 00000000 9f1efe1c 9f1efe00 80365f70 80365d7c
  fe00: 80365f3c 9f1fc800 9f1fc800 00000180 9f1efe44 9f1efe20 803656a4 80365f48
  fe20: 9f1fc800 00000180 9f1efe6c 9f1efe6c 9f732400 00000000 9f1efe64 9f1efe48
  fe40: 803657bc 80365634 00000001 9e95f910 9f1fc800 9f1efeb4 9f1efe8c 9f1efe68
  fe60: 80452ac0 80365778 9f1efe8c 9f1efe78 9e93d400 9e93d5e8 9f1efeb4 9f72ef40
  fe80: 9f1efeac 9f1efe90 8044e11c 80452998 8045298c 9e93d608 9e93d400 808e1978
  fea0: 9f1efecc 9f1efeb0 8044fd14 8044e0d0 ffffffff 9f25a200 9e93d608 9e481380
  fec0: 9f1efedc 9f1efed0 8044fde8 8044fcec 9f1eff1c 9f1efee0 80038d50 8044fdd8
  fee0: 9f1ee020 9f72ef40 9e481398 00000000 00000008 9f72ef54 9f1ee020 9f72ef40
  ff00: 9e481398 9e481380 00000008 9f72ef40 9f1eff5c 9f1eff20 80039754 80038bfc
  ff20: 00000000 9e481380 80894100 808e1662 00000000 9e4f2ec0 00000000 9e481380
  ff40: 800396f8 00000000 00000000 00000000 9f1effac 9f1eff60 8003e020 80039704
  ff60: ffffffff 00000000 ffffffff 9e481380 00000000 00000000 9f1eff78 9f1eff78
  ff80: 00000000 00000000 9f1eff88 9f1eff88 9e4f2ec0 8003df30 00000000 00000000
  ffa0: 00000000 9f1effb0 8000eb60 8003df3c 00000000 00000000 00000000 00000000
  ffc0: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
  ffe0: 00000000 00000000 00000000 00000000 00000013 00000000 ffffffff ffffffff
  Backtrace:
  [<803636ac>] (ftrace_raw_event_regmap_block) from [<80365f2c>] (_regmap_raw_read+0x1bc/0x1cc)
   r9:00000001 r8:808e3840 r7:00000180 r6:00000000 r5:9eb2f490 r4:9f1fc800
  [<80365d70>] (_regmap_raw_read) from [<80365f70>] (_regmap_bus_read+0x34/0x6c)
   r10:00000000 r9:00000000 r8:9f732400 r7:9f1efe6c r6:9f1efe6c r5:9f1fc800
   r4:9f1fc800
  [<80365f3c>] (_regmap_bus_read) from [<803656a4>] (_regmap_read+0x7c/0x144)
   r6:00000180 r5:9f1fc800 r4:9f1fc800 r3:80365f3c
  [<80365628>] (_regmap_read) from [<803657bc>] (regmap_read+0x50/0x70)
   r9:00000000 r8:9f732400 r7:9f1efe6c r6:9f1efe6c r5:00000180 r4:9f1fc800
  [<8036576c>] (regmap_read) from [<80452ac0>] (imx_get_temp+0x134/0x1a4)
   r6:9f1efeb4 r5:9f1fc800 r4:9e95f910 r3:00000001
  [<8045298c>] (imx_get_temp) from [<8044e11c>] (thermal_zone_get_temp+0x58/0x74)
   r7:9f72ef40 r6:9f1efeb4 r5:9e93d5e8 r4:9e93d400
  [<8044e0c4>] (thermal_zone_get_temp) from [<8044fd14>] (thermal_zone_device_update+0x34/0xec)
   r6:808e1978 r5:9e93d400 r4:9e93d608 r3:8045298c
  [<8044fce0>] (thermal_zone_device_update) from [<8044fde8>] (thermal_zone_device_check+0x1c/0x20)
   r5:9e481380 r4:9e93d608
  [<8044fdcc>] (thermal_zone_device_check) from [<80038d50>] (process_one_work+0x160/0x3d4)
  [<80038bf0>] (process_one_work) from [<80039754>] (worker_thread+0x5c/0x4f4)
   r10:9f72ef40 r9:00000008 r8:9e481380 r7:9e481398 r6:9f72ef40 r5:9f1ee020
   r4:9f72ef54
  [<800396f8>] (worker_thread) from [<8003e020>] (kthread+0xf0/0x108)
   r10:00000000 r9:00000000 r8:00000000 r7:800396f8 r6:9e481380 r5:00000000
   r4:9e4f2ec0
  [<8003df30>] (kthread) from [<8000eb60>] (ret_from_fork+0x14/0x34)
   r7:00000000 r6:00000000 r5:8003df30 r4:9e4f2ec0
  Code: e3140040 1a00001a e3140020 1a000016 (e596002c)
  ---[ end trace 193c15c2494ec960 ]---

Fixes: bdb0066df9 (mfd: syscon: Decouple syscon interface from platform devices)
Signed-off-by: Philipp Zabel <p.zabel@pengutronix.de>
Signed-off-by: Mark Brown <broonie@kernel.org>
Cc: stable@vger.kernel.org
2015-03-19 20:04:55 +00:00
..
9p.h 9p: trace: use %*ph to dump buffer 2013-05-28 13:42:08 -05:00
asoc.h ASoC: Remove snd_soc_cache_sync() implementation 2014-11-09 09:06:30 +00:00
bcache.h bcache: fix crash in bcache_btree_node_alloc_fail tracepoint 2014-08-04 15:23:03 -07:00
block.h blktrace: fix accounting of partially completed requests 2014-03-05 16:11:21 -07:00
btrfs.h Btrfs: fix wrong parse of extent map's tracepoint 2014-09-18 07:14:47 -07:00
compaction.h mm/compaction: add tracepoint to observe behaviour of compaction defer 2015-02-11 17:06:04 -08:00
context_tracking.h context_tracking: User/kernel broundary cross trace events 2013-08-14 17:14:48 +02:00
ext3.h jbd: change journal_invalidatepage() to accept length 2013-05-21 23:26:36 -04:00
ext4.h ext4: add optimization for the lazytime mount option 2015-02-05 02:45:00 -05:00
f2fs.h f2fs: fix sparse warnings 2015-02-11 17:04:49 -08:00
fence.h fence: dma-buf cross-device synchronization (v18) 2014-07-08 12:18:56 -07:00
filelock.h locks: generic_delete_lease doesn't need a file_lock at all 2014-10-07 14:06:12 -04:00
filemap.h mm: trace filemap add and del 2013-04-29 15:54:28 -07:00
gfpflags.h mm: get rid of __GFP_KMEMCG 2014-06-04 16:53:56 -07:00
gpio.h
host1x.h gpu: host1x: Use struct host1x_bo pointers in traces 2014-11-13 16:11:32 +01:00
hswadsp.h Merge remote-tracking branches 'asoc/topic/ml26124', 'asoc/topic/of', 'asoc/topic/omap', 'asoc/topic/pxa' and 'asoc/topic/rcar' into asoc-next 2014-03-12 23:04:35 +00:00
i2c.h i2c: Add message transfer tracepoints for SMBUS [ver #2] 2014-03-13 22:15:07 +01:00
intel-sst.h Merge remote-tracking branches 'asoc/topic/ml26124', 'asoc/topic/of', 'asoc/topic/omap', 'asoc/topic/pxa' and 'asoc/topic/rcar' into asoc-next 2014-03-12 23:04:35 +00:00
iommu.h iommu: Change trace unmap api to report unmapped size 2015-01-19 15:19:31 +01:00
ipi.h tracepoint: add generic tracepoint definitions for IPI tracing 2014-08-07 20:40:40 -04:00
irq.h net: treewide: Fix typo found in DocBook/networking.xml 2014-09-05 17:35:28 -07:00
jbd2.h jbd2: trace when lock_buffer in do_get_write_access takes a long time 2013-04-21 16:47:54 -04:00
jbd.h jbd: Write journal superblock with WRITE_FUA after checkpointing 2012-05-15 23:34:37 +02:00
kmem.h mm: when stealing freepages, also take pages created by splitting buddy page 2015-02-11 17:06:06 -08:00
kvm.h Fairly small update, but there are some interesting new features. 2015-02-13 09:55:09 -08:00
lock.h
mce.h
migrate.h mm tracing: tell mm_migrate_pages event about numa_misplaced 2014-08-06 18:01:18 -07:00
module.h module: Replace module_ref with atomic_t refcnt 2014-11-11 17:07:46 +10:30
napi.h
net.h net: rename vlan_tx_* helpers since "tx" is misleading there 2015-01-13 17:51:08 -05:00
nmi.h x86: Add NMI duration tracepoints 2013-06-23 11:52:58 +02:00
oom.h mm, oom: change type of oom_score_adj to short 2012-12-11 17:22:27 -08:00
pagemap.h mm: pagemap: avoid unnecessary overhead when tracepoints are deactivated 2014-08-06 18:01:20 -07:00
power_cpu_migrate.h ARM: bL_switcher/trace: Add trace trigger for trace bootstrapping 2013-09-23 18:47:30 -04:00
power.h PM / sleep: trace events for device PM callbacks 2014-06-11 02:16:48 +02:00
printk.h printk/tracing: rework console tracing 2013-04-29 18:28:13 -07:00
random.h random: convert DEBUG_ENT to tracepoints 2013-10-10 14:32:23 -04:00
rcu.h rcu: Remove redundant TREE_PREEMPT_RCU config option 2014-10-29 10:20:05 -07:00
regmap.h regmap: introduce regmap_name to fix syscon regmap trace events 2015-03-19 20:04:55 +00:00
regulator.h
rpm.h device.h: audit and cleanup users in main include dir 2012-03-16 10:38:24 -04:00
sched.h sched: Fix the PREEMPT_ACTIVE check in __trace_sched_switch_state() 2014-10-28 10:47:53 +01:00
scsi.h scsi: rename SERVICE_ACTION_IN to SERVICE_ACTION_IN_16 2014-11-24 20:01:40 +01:00
signal.h
skb.h
sock.h
spi.h spi: Provide common spi_message processing loop 2013-10-11 20:09:50 +01:00
sunrpc.h sunrpc: add some tracepoints around enqueue and dequeue of svc_xprt 2014-12-09 11:29:14 -05:00
swiotlb.h tracing/events: Add bounce tracing to swiotbl 2013-10-02 12:53:26 -04:00
syscalls.h tracepoint: Fix sparse warnings in tracepoint.c 2014-04-09 10:12:11 -04:00
target.h Merge remote-tracking branch 'scsi-queue/drivers-for-3.19' into for-linus 2014-12-18 05:56:29 -08:00
task.h exec: kill bprm->tcomm[], simplify the "basename" logic 2014-04-07 16:36:05 -07:00
thermal.h thermal: trace: Trace when temperature is above a trip point 2014-07-29 09:28:43 -04:00
thp.h powerpc/thp: Add tracepoints to track hugepage invalidate 2014-08-13 18:20:42 +10:00
timer.h Merge branch 'timers-nohz-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip 2013-05-05 13:23:27 -07:00
tlb.h x86/tlb/trace: Do not trace on CPU that is offline 2015-02-07 19:34:55 -05:00
udp.h
v4l2.h [media] v4l: add stream format for SDR receiver 2014-03-05 14:15:12 -03:00
vmscan.h mm: shrinker: add nid to tracepoint output 2014-06-04 16:54:04 -07:00
workqueue.h workqueue: rename cpu_workqueue to pool_workqueue 2013-02-13 19:29:12 -08:00
writeback.h Merge branch 'lazytime' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs 2015-02-17 16:12:34 -08:00
xen.h xen/mmu: Use Xen specific TLB flush instead of the generic one. 2012-10-31 12:38:31 -04:00