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path: root/sound/soc/codecs/uda134x.h
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#ifndef _UDA134X_CODEC_H
#define _UDA134X_CODEC_H

#define UDA134X_L3ADDR	5
#define UDA134X_DATA0_ADDR	((UDA134X_L3ADDR << 2) | 0)
#define UDA134X_DATA1_ADDR	((UDA134X_L3ADDR << 2) | 1)
#define UDA134X_STATUS_ADDR	((UDA134X_L3ADDR << 2) | 2)

#define UDA134X_EXTADDR_PREFIX	0xC0
#define UDA134X_EXTDATA_PREFIX	0xE0

/* UDA134X registers */
#define UDA134X_EA000	0
#define UDA134X_EA001	1
#define UDA134X_EA010	2
#define UDA134X_EA011	3
#define UDA134X_EA100	4
#define UDA134X_EA101	5
#define UDA134X_EA110	6
#define UDA134X_EA111	7
#define UDA134X_STATUS0 8
#define UDA134X_STATUS1 9
#define UDA134X_DATA000 10
#define UDA134X_DATA001 11
#define UDA134X_DATA010 12
#define UDA134X_DATA011 13
#define UDA134X_DATA1   14

#define STATUS0_DAIFMT_MASK (~(7<<1))
#define STATUS0_SYSCLK_MASK (~(3<<4))

#endif
41'>patch) tree4b96156e3d1dd4dfd6039b7c219c9dc4616da52d /tools/testing/selftests/timers/valid-adjtimex.c parent1b1bc42c1692e9b62756323c675a44cb1a1f9dbd (diff)
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+
Diffstat (limited to 'tools/testing/selftests/timers/valid-adjtimex.c')