/* * GPIO definitions for Amlogic Meson GXL SoCs * * Copyright (C) 2016 Endless Mobile, Inc. * Author: Carlo Caione * * This program is free software; you can redistribute it and/or * modify it under the terms of the GNU General Public License * version 2 as published by the Free Software Foundation. * * You should have received a copy of the GNU General Public License * along with this program. If not, see . */ #ifndef _DT_BINDINGS_MESON_GXL_GPIO_H #define _DT_BINDINGS_MESON_GXL_GPIO_H #define GPIOAO_0 0 #define GPIOAO_1 1 #define GPIOAO_2 2 #define GPIOAO_3 3 #define GPIOAO_4 4 #define GPIOAO_5 5 #define GPIOAO_6 6 #define GPIOAO_7 7 #define GPIOAO_8 8 #define GPIOAO_9 9 #define GPIOZ_0 0 #define GPIOZ_1 1 #define GPIOZ_2 2 #define GPIOZ_3 3 #define GPIOZ_4 4 #define GPIOZ_5 5 #define GPIOZ_6 6 #define GPIOZ_7 7 #define GPIOZ_8 8 #define GPIOZ_9 9 #define GPIOZ_10 10 #define GPIOZ_11 11 #define GPIOZ_12 12 #define GPIOZ_13 13 #define GPIOZ_14 14 #define GPIOZ_15 15 #define GPIOH_0 16 #define GPIOH_1 17 #define GPIOH_2 18 #define GPIOH_3 19 #define GPIOH_4 20 #define GPIOH_5 21 #define GPIOH_6 22 #define GPIOH_7 23 #define GPIOH_8 24 #define GPIOH_9 25 #define BOOT_0 26 #define BOOT_1 27 #define BOOT_2 28 #define BOOT_3 29 #define BOOT_4 30 #define BOOT_5 31 #define BOOT_6 32 #define BOOT_7 33 #define BOOT_8 34 #define BOOT_9 35 #define BOOT_10 36 #define BOOT_11 37 #define BOOT_12 38 #define BOOT_13 39 #define BOOT_14 40 #define BOOT_15 41 #define CARD_0 42 #define CARD_1 43 #define CARD_2 44 #define CARD_3 45 #define CARD_4 46 #define CARD_5 47 #define CARD_6 48 #define GPIODV_0 49 #define GPIODV_1 50 #define GPIODV_2 51 #define GPIODV_3 52 #define GPIODV_4 53 #define GPIODV_5 54 #define GPIODV_6 55 #define GPIODV_7 56 #define GPIODV_8 57 #define GPIODV_9 58 #define GPIODV_10 59 #define GPIODV_11 60 #define GPIODV_12 61 #define GPIODV_13 62 #define GPIODV_14 63 #define GPIODV_15 64 #define GPIODV_16 65 #define GPIODV_17 66 #define GPIODV_18 67 #define GPIODV_19 68 #define GPIODV_20 69 #define GPIODV_21 70 #define GPIODV_22 71 #define GPIODV_23 72 #define GPIODV_24 73 #define GPIODV_25 74 #define GPIODV_26 75 #define GPIODV_27 76 #define GPIODV_28 77 #define GPIODV_29 78 #define GPIOX_0 79 #define GPIOX_1 80 #define GPIOX_2 81 #define GPIOX_3 82 #define GPIOX_4 83 #define GPIOX_5 84 #define GPIOX_6 85 #define GPIOX_7 86 #define GPIOX_8 87 #define GPIOX_9 88 #define GPIOX_10 89 #define GPIOX_11 90 #define GPIOX_12 91 #define GPIOX_13 92 #define GPIOX_14 93 #define GPIOX_15 94 #define GPIOX_16 95 #define GPIOX_17 96 #define GPIOX_18 97 #define GPIOCLK_0 98 #define GPIOCLK_1 99 #define GPIO_TEST_N 100 #endif ='submit' value='search'/>
path: root/net/mac80211/rx.c
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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/mac80211/rx.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/mac80211/rx.c')