/* * Platform data for ST STA350 ASoC codec driver. * * Copyright: 2014 Raumfeld GmbH * Author: Sven Brandau * * This program is free software; you can redistribute it and/or modify it * under the terms of the GNU General Public License as published by the * Free Software Foundation; either version 2 of the License, or (at your * option) any later version. */ #ifndef __LINUX_SND__STA350_H #define __LINUX_SND__STA350_H #define STA350_OCFG_2CH 0 #define STA350_OCFG_2_1CH 1 #define STA350_OCFG_1CH 3 #define STA350_OM_CH1 0 #define STA350_OM_CH2 1 #define STA350_OM_CH3 2 #define STA350_THERMAL_ADJUSTMENT_ENABLE 1 #define STA350_THERMAL_RECOVERY_ENABLE 2 #define STA350_FAULT_DETECT_RECOVERY_BYPASS 1 #define STA350_FFX_PM_DROP_COMP 0 #define STA350_FFX_PM_TAPERED_COMP 1 #define STA350_FFX_PM_FULL_POWER 2 #define STA350_FFX_PM_VARIABLE_DROP_COMP 3 struct sta350_platform_data { u8 output_conf; u8 ch1_output_mapping; u8 ch2_output_mapping; u8 ch3_output_mapping; u8 ffx_power_output_mode; u8 drop_compensation_ns; u8 powerdown_delay_divider; unsigned int thermal_warning_recovery:1; unsigned int thermal_warning_adjustment:1; unsigned int fault_detect_recovery:1; unsigned int oc_warning_adjustment:1; unsigned int max_power_use_mpcc:1; unsigned int max_power_correction:1; unsigned int am_reduction_mode:1; unsigned int odd_pwm_speed_mode:1; unsigned int distortion_compensation:1; unsigned int invalid_input_detect_mute:1; unsigned int activate_mute_output:1; unsigned int bridge_immediate_off:1; unsigned int noise_shape_dc_cut:1; unsigned int powerdown_master_vol:1; }; #endif /* __LINUX_SND__STA350_H */ logtreecommitdiff
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authorDouglas Miller <dougmill@linux.vnet.ibm.com>2017-01-28 06:42:20 -0600
committerTejun Heo <tj@kernel.org>2017-01-28 07:49:42 -0500
commit966d2b04e070bc040319aaebfec09e0144dc3341 (patch)
tree4b96156e3d1dd4dfd6039b7c219c9dc4616da52d /net/sunrpc/xprtsock.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 'net/sunrpc/xprtsock.c')