percpu-refcount: fix reference leak during percpu-atomic transition

percpu_ref_tryget() and percpu_ref_tryget_live() should return
"true" IFF they acquire a reference. But the return value from
atomic_long_inc_not_zero() is a long and may have high bits set,
e.g. PERCPU_COUNT_BIAS, and the return value of the tryget routines
is bool so the reference may actually be acquired but the routines
return "false" which results in a reference leak since the caller
assumes it does not need to do a corresponding percpu_ref_put().

This was seen when performing CPU hotplug during I/O, as hangs in
blk_mq_freeze_queue_wait where percpu_ref_kill (blk_mq_freeze_queue_start)
raced with percpu_ref_tryget (blk_mq_timeout_work).
Sample stack trace:

__switch_to+0x2c0/0x450
__schedule+0x2f8/0x970
schedule+0x48/0xc0
blk_mq_freeze_queue_wait+0x94/0x120
blk_mq_queue_reinit_work+0xb8/0x180
blk_mq_queue_reinit_prepare+0x84/0xa0
cpuhp_invoke_callback+0x17c/0x600
cpuhp_up_callbacks+0x58/0x150
_cpu_up+0xf0/0x1c0
do_cpu_up+0x120/0x150
cpu_subsys_online+0x64/0xe0
device_online+0xb4/0x120
online_store+0xb4/0xc0
dev_attr_store+0x68/0xa0
sysfs_kf_write+0x80/0xb0
kernfs_fop_write+0x17c/0x250
__vfs_write+0x6c/0x1e0
vfs_write+0xd0/0x270
SyS_write+0x6c/0x110
system_call+0x38/0xe0

Examination of the queue showed a single reference (no PERCPU_COUNT_BIAS,
and __PERCPU_REF_DEAD, __PERCPU_REF_ATOMIC set) and no requests.
However, conditions at the time of the race are count of PERCPU_COUNT_BIAS + 0
and __PERCPU_REF_DEAD and __PERCPU_REF_ATOMIC set.

The fix is to make the tryget routines use an actual boolean internally instead
of the atomic long result truncated to a int.

Fixes: e625305b3907 percpu-refcount: make percpu_ref based on longs instead of ints
Link: https://bugzilla.kernel.org/show_bug.cgi?id=190751
Signed-off-by: Douglas Miller <dougmill@linux.vnet.ibm.com>
Reviewed-by: Jens Axboe <axboe@fb.com>
Signed-off-by: Tejun Heo <tj@kernel.org>
Fixes: e625305b3907 ("percpu-refcount: make percpu_ref based on longs instead of ints")
Cc: stable@vger.kernel.org # v3.18+

path: root/sound/isa/Makefile

#
# Makefile for ALSA
# Copyright (c) 2001 by Jaroslav Kysela <perex@perex.cz>
#

snd-adlib-objs := adlib.o
snd-als100-objs := als100.o
snd-azt2320-objs := azt2320.o
snd-cmi8328-objs := cmi8328.o
snd-cmi8330-objs := cmi8330.o
snd-es18xx-objs := es18xx.o
snd-opl3sa2-objs := opl3sa2.o
snd-sc6000-objs := sc6000.o
snd-sscape-objs := sscape.o

# Toplevel Module Dependency
obj-$(CONFIG_SND_ADLIB) += snd-adlib.o
obj-$(CONFIG_SND_ALS100) += snd-als100.o
obj-$(CONFIG_SND_AZT2320) += snd-azt2320.o
obj-$(CONFIG_SND_CMI8328) += snd-cmi8328.o
obj-$(CONFIG_SND_CMI8330) += snd-cmi8330.o
obj-$(CONFIG_SND_ES18XX) += snd-es18xx.o
obj-$(CONFIG_SND_OPL3SA2) += snd-opl3sa2.o
obj-$(CONFIG_SND_SC6000) += snd-sc6000.o
obj-$(CONFIG_SND_SSCAPE) += snd-sscape.o

obj-$(CONFIG_SND) += ad1816a/ ad1848/ cs423x/ es1688/ galaxy/ gus/ msnd/ opti9xx/ \
		     sb/ wavefront/ wss/