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Wu Fengguang 977b7e3a52 writeback: fix dereferencing NULL bdi->dev on trace_writeback_queue ... When a SD card is hot removed without umount, del_gendisk() will call bdi_unregister() without destroying/freeing it. This leaves the bdi in the bdi->dev = NULL, bdi->wb.task = NULL, bdi->bdi_list removed state. When sync(2) gets the bdi before bdi_unregister() and calls bdi_queue_work() after the unregister, trace_writeback_queue will be dereferencing the NULL bdi->dev. Fix it with a simple test for NULL. LKML-reference: http://lkml.org/lkml/2012/1/18/346 Cc: stable@kernel.org Reported-by: Rabin Vincent <rabin@rab.in> Tested-by: Namjae Jeon <linkinjeon@gmail.com> Signed-off-by: Wu Fengguang <fengguang.wu@intel.com>		13 years ago
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9p.h	…
asoc.h	…
block.h	…
btrfs.h	Btrfs: space leak tracepoints	13 years ago
compaction.h	…
ext3.h	…
ext4.h	ext4: do not reference pa_inode from group_pa	13 years ago
gfpflags.h	…
gpio.h	…
irq.h	…
jbd.h	…
jbd2.h	…
kmem.h	mm-tracepoint: rename page-free events	13 years ago
kvm.h	…
lock.h	…
mce.h	…
module.h	include: replace linux/module.h with "struct module" wherever possible	14 years ago
napi.h	…
net.h	…
oom.h	tracepoint: add tracepoints for debugging oom_score_adj	13 years ago
power.h	…
rcu.h	rcu: Augment rcu_batch_end tracing for idle and callback state	13 years ago
regmap.h	regmap: Add trace event for successful cache reads	13 years ago
regulator.h	…
rpm.h	…
sched.h	sched/tracing: Add a new tracepoint for sleeptime	13 years ago
scsi.h	…
signal.h	…
skb.h	…
sock.h	…
syscalls.h	…
task.h	tracepoint: add tracepoints for debugging oom_score_adj	13 years ago
timer.h	…
udp.h	…
vmscan.h	vmscan/trace: Add 'file' info to trace_mm_vmscan_lru_isolate()	13 years ago
workqueue.h	…
writeback.h	writeback: fix dereferencing NULL bdi->dev on trace_writeback_queue	13 years ago
xen.h	…